From Sonny's public comments though, I think Dr. White is going to let his published experimental data speak to the merits of his arguments as they become available from his DoD security imposed "Fortress of Solitude".Best, Paul M.
I guess I was thinking for a set pressure in the vacuum if the density of the osculators changes for a set volume. For an idea gas.V=constant, P=constant if n doubles then T becomes half. Assuming the vacuum is at some pressure equilibrium. So if energy per oscillator decreases, connecting that to time slowing near gravitational objects. Not sure if that makes complete sense. Interesting we again have the 2/3 rds.
Quote from: dustinthewind on 09/19/2019 06:48 pmI guess I was thinking for a set pressure in the vacuum if the density of the osculators changes for a set volume. For an idea gas.V=constant, P=constant if n doubles then T becomes half. Assuming the vacuum is at some pressure equilibrium. So if energy per oscillator decreases, connecting that to time slowing near gravitational objects. Not sure if that makes complete sense. Interesting we again have the 2/3 rds.There is no 3/2 in the ideal gas equation, you may have gotten confused with other related equations like the equation for energy in the gas.https://en.wikipedia.org/wiki/Ideal_gas_lawAnyway, you again seem to be slamming random physics models together, and acting like this is somehow valid. This is not something that actually yields useful results.
Entropic Dynamics: Quantum Mechanics from Entropy and Information GeometryAriel CatichaDepartment of Physics, University at Albany–SUNY, Albany, NY 12222, USAOne must introduce the notion of an ‘instant’; one must show thatthese instants are suitably ordered; and finally one must define a convenientmeasure of the duration or interval between the successive instants. It turns outthat an arrow of time is generated automatically. Entropic time is intrinsicallydirectional....3 Entropic time...— the notion oftime constructed below will reflect the inferential nature of entropic dynamics.Such a construction we will call entropic time [9]....Second, in ED entropic time isconstructed so that time (duration) is defined by a clock that is provided bythe system itself. More precisely, time is measured by the fluctuations of freeparticles
Entropic Dynamics of Quantum Scalar Fields inCurved SpacetimeSelman Ipek, Mohammad Abedi, and Ariel CatichaPhysics Department, University at Albany-SUNY, Albany, NY 12222, USAIn the Entropic Dynamics framework quantum theory is derived asan application of the method of maximum entropy. In previous work theentropic dynamics of relativistic quantum scalar fields was formulated inthe Schr¨odinger functional representation in which the Lorentz symmetryis not manifest. Here the formalism is extended to curved spacetimes.We develop a manifestly covariant approach inspired by the Hamiltonianmethods of Dirac, Kuchaˇr, and Teitelboim. The key ingredient is theadoption of a local notion of entropic time in which instants are definedon curved three-dimensional surfaces and time evolution consists of theaccumulation of changes induced by local deformations of these surfaces...Another example concerns the meaning of covariance in a quantum theory.The question is: what is it that satisfies the principle of relativity? Is it the onticfields or the epistemic state? The ED approach provides a definitive answer infavor of the latter. It is the state of knowledge that is updated in a covariantmanner, not the fields themselves. We expect this kind of clarity to becomemore important as we pursue an ED of gravity. And indeed, we conclude bynoting that there appears to be no serious impediment to a straightforwardextension of the ED of quantum fields in a prescribed background space-timeto a fully dynamical gravity along lines inspired by [33].
Quote from: meberbs on 09/19/2019 06:55 pmQuote from: dustinthewind on 09/19/2019 06:48 pmI guess I was thinking for a set pressure in the vacuum if the density of the osculators changes for a set volume. For an idea gas.V=constant, P=constant if n doubles then T becomes half. Assuming the vacuum is at some pressure equilibrium. So if energy per oscillator decreases, connecting that to time slowing near gravitational objects. Not sure if that makes complete sense. Interesting we again have the 2/3 rds.There is no 3/2 in the ideal gas equation, you may have gotten confused with other related equations like the equation for energy in the gas.https://en.wikipedia.org/wiki/Ideal_gas_lawAnyway, you again seem to be slamming random physics models together, and acting like this is somehow valid. This is not something that actually yields useful results. The thermal vacuum defining time I don't think is new concept. There is work out there on it. I'm not sure this reference defines the connection to relativity but in the end if they define time and space it should link relativity or gravity to quantum mechanics.
I would say that they are probably connected, what makes quantum mechanics what it is, radioactive decay, their perturbed cloud that defines the structure of the electron orbitals, gravity, and space time around large amounts of matter and the thermal nature of time.
Quote from: dustinthewind on 09/22/2019 09:31 pmQuote from: meberbs on 09/19/2019 06:55 pmQuote from: dustinthewind on 09/19/2019 06:48 pmI guess I was thinking for a set pressure in the vacuum if the density of the osculators changes for a set volume. For an idea gas.V=constant, P=constant if n doubles then T becomes half. Assuming the vacuum is at some pressure equilibrium. So if energy per oscillator decreases, connecting that to time slowing near gravitational objects. Not sure if that makes complete sense. Interesting we again have the 2/3 rds.There is no 3/2 in the ideal gas equation, you may have gotten confused with other related equations like the equation for energy in the gas.https://en.wikipedia.org/wiki/Ideal_gas_lawAnyway, you again seem to be slamming random physics models together, and acting like this is somehow valid. This is not something that actually yields useful results. The thermal vacuum defining time I don't think is new concept. There is work out there on it. I'm not sure this reference defines the connection to relativity but in the end if they define time and space it should link relativity or gravity to quantum mechanics. What in the world are you talking about? These statements are in no way related to what I just said. You don't even acknowledge that you got a well known equation that is easy to look up wrong.Quote from: dustinthewind on 09/22/2019 09:31 pmI would say that they are probably connected, what makes quantum mechanics what it is, radioactive decay, their perturbed cloud that defines the structure of the electron orbitals, gravity, and space time around large amounts of matter and the thermal nature of time. That sentence literally doesn't mean anything. Scientists have been looking for a "theory of everything" for a long time. Picking a few completely random things and calling them "connected" is not useful in any way. Electron orbitals are not significantly affected by gravity, the scales are simply different. The sources you quote don't even support the phrase "thermal nature of time" to have any meaning. (Entropy and thermal are different words and mean different things.)
Well I don't expect you to either.
Quote from: dustinthewind on 09/22/2019 11:57 pmWell I don't expect you to either.What don't you expect me to do?Meaningless posts like this don't add any value.
Superluminal squeezing propagationIn conclusion, we have experimentally demonstrated that it is possible to observe superluminal squeezed vacuum propagation. The largest measured advancement was 3 μs.
I didn't expect you to approach it in a way that expressed that you liked the idea, or that it made sense to you. I kind of threw it at Star-Drive and those that are already exploring that field. Pointing out similarities in other papers.
You can also squeeze the vacuum. I don't know a lot about it but I think it has connotations of increasing the thermal activity per osculator increasing the passage of time - increasing the non-local speed of light possibly. Exciting the vacuum making it more observable also. Here is an example.
Anyways there are lots of puzzle pieces that seem to fit together by looking at the vacuum as a natural vacuum that can carry thermal energy and be perturbed. Some of the papers I linked a few posts above https://forum.nasaspaceflight.com/index.php?topic=48852.msg1995303#msg1995303went as far as to hint at the connection to time as a thermal aspect of the vacuum, making quantum calculations easier (don't know a lot about that myself though), and connections to general relativity. Just food for thought.
https://arxiv.org/pdf/1404.5567.pdfVariable speed of light cosmology, primordial fluctuations and gravitational wavesJ. W. MoffatOctober 6, 2018The homogeneous Lorentz group SO(3, 1) is broken down to the spatial rotation group O(3). The threerotation generators Ji (i = 1, 2, 3) leave the vacuum invariant, Jivi = 0, while the Lorentz boost generatorsKi break the vacuum symmetry Kivi 6= 0. The spontaneous breaking of the Lorentz and diffeomorphismsymmetries produces massless Nambu-Goldstone modes and massive particle modes [30, 31]. The spontaneous breaking of Lorentz invariance and diffeomorphism invariance has selected a preferred frame anddirection of time....We have formulated a VSL model in which the homogeneous Lorentz group SO(3, 1) is spontaneously brokento the rotation group O(3) by the non-zero vacuum expectation value h0|ψµ|0i. This determines a preferredtime t in the cosmological model corresponding to the comoving time in an FLRW spacetime.In contrast to the inflationary scenario, our VSL model prediction of the almost scale invariant, Gaussianfluctuation spectra for matter and relic gravitational waves does not rely on determining the shape of apotential and its derivatives. The model can relieve the fine-tuning that is inevitably a consequence ofinflationary models...Since the ordered phase in the spontaneous symmetry breaking of Lorentz invariance is at a much lowerentropy than the restored, disordered symmetry phase and due to the existence of a domain determined bythe direction of the vev, h0|ψµ|0i, a natural explanation is given for the cosmological arrow of time and theorigin of the second law of thermodynamics [11, 12, 37]. The ordered state of low entropy in the symmetrybroken phase with c ≫ c0, becomes a state of high entropy in the symmetry restored disordered phasewith c = c0. The spontaneous symmetry breaking of the gravitational vacuum leads to a manifold with thestructure O(3) × R, in which time appears as an absolute external time parameter. The vev h0|ψµ|0i pointsin a chosen direction of time to break the symmetry of the vacuum creating an arrow of time.
Gravitational Entropy and the Second Law of Thermodynamicsby John W. MoffatAbstractThe spontaneous violation of Lorentz and diffeomorphism invariance in a phase near the big bang lowers the entropy, allowing for an arrow of time and the second law of thermodynamics. The spontaneous symmetry breaking leads to O(3,1) → O(3) × R , where O(3) is the rotational symmetry of the Friedmann–Lemaître–Robertson–Walker spacetime. The Weyl curvature tensor Cμνρσ vanishes in the FLRW spacetime satisfying the Penrose zero Weyl curvature conjecture. The requirement of a measure of gravitational entropy is discussed. The vacuum expectation value 〈0|ψμ|0〉 ≠ 0 for a vector field ψμ acts as an order parameter and at the critical temperature Tc a phase transition occurs breaking the Lorentz symmetry spontaneously. During the ordered O(3) symmetry phase the entropy is vanishingly small and for T < Tc as the universe expands the anti-restored O(3,1) Lorentz symmetry leads to a disordered phase and a large increase in entropy creating the arrow of time. View Full-Text
https://search.proquest.com/openview/8b295b8925ec2606c6076123f33a1dbf/1?pq-origsite=gscholar&cbl=1796373Tests and prospects of new physics at very high energy. Beyond the standard basic principles, and beyond conventional matter and space-time. On the possible origin of Quantum Mechanics.Abstract. Recent results and announcements by Planck and BICEP2 have led to important controversies in the fields of Cosmology and Particle Physics. As new ideas and alternative approaches can since then more easily emerge, the link between the MathematicalPhysics aspects of theories and the interpretation of experimental results becomes moredirect. This evolution is also relevant for Particle Physics experiments at very high energy,where the interpretation of data on the highest-energy cosmic rays remains a major theoretical and phenomenological challenge. Alternative particle physics and cosmology canraise fundamental questions such as that of the structure of vacuum and space-time. Inparticular, the simplified description of the physical vacuum contained in standard quantum field theory does not necessarily correspond to reality at a deeper level, and similarlyfor the relativistic space-time based on four real variables. In a more general approach,the definition itself of vacuum can be a difficult task. The spinorial space-time (SST) wesuggested in 1996-97 automatically incorporates a local privileged space direction (PSD)for each comoving observer, possibly leading to a locally anisotropic vacuum structure.As the existence of the PSD may have been confirmed by Planck, and a possible discovery of primordial B-modes in the polarization of the cosmic microwave backgroundradiation (CMB) may turn out to contain new evidence for the SST, we explore otherpossible implications of this approach to space-time. The SST structure can naturally beat the origin of Quantum Mechanics at distance scales larger than the fundamental one ifstandard particles are dealt with as vacuum excitations. We also discuss possible implications of our lack of knowledge of the structure of vacuum, as well as related theoretical,phenomenological and cosmological uncertainties. Pre-Big Bang scenarios and new ultimate constituents of matter (including superbradyons) are crucial open subjects, togetherwith vacuum structure and the interaction between vacuum and standard matterPossible deformations of the particle kinematics were already discussed in [37, 65] and in subsequentpapers as a way to test Lorentz symmetry at very high energy.To possibly account for Lorentz symmetry violation (LSV), and assuming the existence of a privileged local rest frame (the vacuum rest frame, VRF)But as emphasized in [1], if CMB B-modes corresponding to a signature of the early Universe dynamicsare finally found, they can, together with the local privileged space direction (PSD) [12, 13] possiblyobserved by Planck [4], provide an unprecedented evidence [14, 15] for the spinorial space-time (SST)we introduced in 1996-97
https://arxiv.org/abs/1612.06367Statistical hierarchy of varying speed of light cosmologiesVincenzo Salzano1 and Mariusz P. D¸abrowski1, 2, 3January 8, 2018Variation of the speed of light is quite a debated issue in cosmology with some benefits, but alsowith some controversial concerns. Many approaches to develop a consistent varying speed of light(VSL) theory have been developed recently. Although a lot of theoretical debate has sprout outabout their feasibility and reliability, the most obvious and straightforward way to discriminate andcheck if such theories are really workable has been missed out or not fully employed. What is meanthere is the comparison of these theories with observational data in a fully comprehensive way. In thispaper we try to address this point i.e., by using the most updated cosmological probes, we test threedifferent candidates for a VSL theory (Barrow & Magueijo, Avelino & Martins, and Moffat) signal.We consider many different ans¨atze for both the functional form of c(z) (which cannot be fixed bytheoretical motivations) and for the dark energy dynamics, in order to have a clear global picturefrom which we extract the results. We compare these results using a reliable statistical tool such asthe Bayesian Evidence. We find that the present cosmological data is perfectly compatible with anyof these VSL scenarios, but in one case (Moffat model) we have a higher Bayesian Evidence ratio infavour of VSL than in the standard c = constant ΛCDM scenario. Moreover, in such a scenario, theVSL signal can help to strengthen constraints on the spatial curvature (with indication toward anopen universe), to clarify some properties of dark energy (exclusion of a cosmological constant at 2σlevel) and is also falsifiable in the nearest future due to some peculiar issues which differentiate thismodel from the standard model. Finally, we have applied some priors which come from cosmologyand, in particular, from information theory and gravitational thermodynamics. They put strongerconstraints on the models under consideration, though still in favour of two of the Moffat’s proposals
Varying constants driven baryogenesisKatarzyna Leszczynska, Mariusz P. Dabrowski, Tomasz Denkiewiczlast revised 24 Mar 2019We study the spontaneous baryogenesis scenario in the early universe for three different frameworks of varying constants theories. We replace the constants by dynamical scalar fields playing therole of thermions. We first obtain the results for baryogenesis driven by the varying gravitationalconstant, G, as in the previous literature, then challenge the problem for varying fine structureconstant α models as well as for varying speed of light c models. We show that in each of theseframeworks the current observational value of the baryon to entropy ratio, ηB ∼ 8.6 · 10−11, canbe obtained for large set of parameters of dynamical constants models as well as the decouplingtemperature, and the characteristic cut-off length scale.
Why is the CMB a preferred reference frame? As far as I know, it should be a sphere at the outer edge of the observable universe in all directions, should it not?
The origin of time is mentioned related to thermal.
Quote from: RotoSequence on 09/27/2019 07:25 amWhy is the CMB a preferred reference frame? As far as I know, it should be a sphere at the outer edge of the observable universe in all directions, should it not?If there is a local vacuum frame, then there might be many possible preferred frames depending on your location. (act like they flow into gravity wells) . I suspect the CMB dipole may shift depending on your location with respect to gravitational fields and velocity in your local vacuum frame. Gravity can also red/blue shift light. Warp drive might not induce a dipole shift in the CMB if it seems your are not moving with respect to the local vacuum. An example might be residing in a gravitomagnetic effect (Lense-Thirring effect or frame dragging) where (non-locally) your local space time appears to rotate. Or locally it appears your stationary, but the universe appears to rotate.https://en.wikipedia.org/wiki/Lense%E2%80%93Thirring_precession
Quote from: dustinthewind on 09/27/2019 07:04 amThe origin of time is mentioned related to thermal. Nothing in anything you quoted states this.I have already repeatedly explained to you that entropy does NOT equal thermal.Your repeated misrepresentations on this show great disrespect for the scientists you are quoting, and that is not okay.Quote from: dustinthewind on 09/27/2019 07:41 amQuote from: RotoSequence on 09/27/2019 07:25 amWhy is the CMB a preferred reference frame? As far as I know, it should be a sphere at the outer edge of the observable universe in all directions, should it not?If there is a local vacuum frame, then there might be many possible preferred frames depending on your location. (act like they flow into gravity wells) . I suspect the CMB dipole may shift depending on your location with respect to gravitational fields and velocity in your local vacuum frame. Gravity can also red/blue shift light. Warp drive might not induce a dipole shift in the CMB if it seems your are not moving with respect to the local vacuum. An example might be residing in a gravitomagnetic effect (Lense-Thirring effect or frame dragging) where (non-locally) your local space time appears to rotate. Or locally it appears your stationary, but the universe appears to rotate.https://en.wikipedia.org/wiki/Lense%E2%80%93Thirring_precessionYou have the definition of preferred frame wrong. A preferred frame would be valid anywhere, not changing at every point. (Actually that is true of any frame, a frame encompasses the whole geometry of spacetime at all points by definition.) The special thing about a preferred frame is that it is an obvious reference frame that everyone can agree on because the laws of physics somehow are special with regards to that frame. The only thing we know of that is special about the CMB frame is that you feel a tiny amount of radiation pressure from the CMB slowing you down when you move relative to it. This isn't really special when it comes to the laws of physics, though if we ever discovered a meaningful preferred frame, it would probably have similar velocity to the CMB frame.
Gravity with a dynamical preferred frameTed Jacobson, David MattinglyPhysical Review D 64 (2), 024028, 2001We study a generally covariant model in which local Lorentz invariance is broken by a dynamical unit timelike vector field u a—the “aether.” Such a model makes it possible to study the gravitational and cosmological consequences of preferred frame effects, such as “variable speed of light” or high frequency dispersion, while preserving a generally covariant metric theory of gravity. In this paper we restrict attention to an action for an effective theory of the aether which involves only the antisymmetrized derivative∇[a u b]. Without matter this theory is equivalent to a sector of the Einstein-Maxwell-charged dust system. The aether has two massless transverse excitations, and the solutions of the model include all vacuum solutions of general relativity (as well as other solutions). However, the aether generally develops gradient singularities which signal a breakdown of this effective theory. Including the symmetrized derivative in the action for the aether field may cure this problem.
Since the ordered phase in the spontaneous symmetry breaking of Lorentz invariance is at a much lowerentropy than the restored, disordered symmetry phase and due to the existence of a domain determined bythe direction of the vev, h0|ψµ|0i, a natural explanation is given for the cosmological arrow of time and theorigin of the second law of thermodynamics [11, 12, 37].
This citation kind of touches on the subject. I would like to find something newer on it but haven't had the time. There is a lot of references though.
Think of it this way, when gravity acts on light it Doppler shifts it, and this is actually the light traveling through a change of frame.
one might be able to think of as time slowing down as moving with respect to your local space-time. A ship with a warp drive bubble around it would have a gravitational field around it that counteracts the CMB dipole shift. In effect making its local vacuum appear as stationary with respect to it. It's clock would tick at a normal rate with respect to the rest of the universe.
Quote from: dustinthewind on 09/28/2019 06:52 pmThis citation kind of touches on the subject. I would like to find something newer on it but haven't had the time. There is a lot of references though. Touches on what? This does nothing to support the nonsense you kept repeating about "thermal" being related to time.Quote from: dustinthewind on 09/28/2019 06:52 pmThink of it this way, when gravity acts on light it Doppler shifts it, and this is actually the light traveling through a change of frame. First of all, the gravitational redshift or blueshift of light that you talk about for the rest of your post is a standard GR effect, and not dependent on a variable speed of light theory like your quote discussed.Second, you are still misusing "frame." If you insist on talking about GR, the term your should really be discussing is the metric. There is only one metric, and that describes the structure of spacetime. If you write down the metric in the form of a tensor, the exact elements of the metric will depend on the coordinates you choose (which includes effectively picking a velocity, or what would be considered a "frame" in special relativity.) Additionally, the metric tensor takes on different values at each point in spacetime even after you have chosen your set of coordinates. These differences between different locations are what cause gravitational frequency shifts of light.However, this is all just standard GR, and nothing in what you are discussing is relevant to this thread, or to the links you have been posting.Quote from: dustinthewind on 09/28/2019 06:52 pmone might be able to think of as time slowing down as moving with respect to your local space-time. A ship with a warp drive bubble around it would have a gravitational field around it that counteracts the CMB dipole shift. In effect making its local vacuum appear as stationary with respect to it. It's clock would tick at a normal rate with respect to the rest of the universe. We have an Alcubierre drive thread if you want to discuss that (for some reason it is in Advanced concepts instead of New Physics), it is not on topic in this thread.You have completely stopped talking about anything remotely relevant to this thread, as you have completely changed topics multiple times everytime something you said was pointed out as being wrong, without ever acknowledging your mistakes. There does not seem to be any point to any of your posts.
academia.eduGravity originates from variable energy density of quantum vacuumLuigi Maxmilian Caligiuri, Amrit SorliAmerican Journal of Modern Physics 3 (3), 118-128, 2014The physical understanding of the real mechanism of gravity is one of the most important questions in Physics. As we have already shown in a previous paper, the rest and relativistic mass of an elementary particle or body can be considered as having their origin in the diminished energy density of a Quantum Vacuum, characterized by a granular structure quantized through a Planck metric. The presence of massive bodies, from the scale of elementary particles to that of stellar objects and black holes, then determines Quantum Vacuum energy density gradients. In this paper we have proposed a novel physical model in which gravity is generated by the pressure of Quantum Vacuum in the direction of its own higher to lower density due to the presence of material objects or particles. In this picture gravity is an immediate and not–propagating action–at–a–distance interaction, resulting from the Quantum Vacuum dynamics, in turn related to fundamental properties of space itself only, not requiring the existence of the hypothetical graviton. Furthermore, the possibility to consider this Quantum Vacuum as a Bose–Einstein like condensate allows us to recover the large–scale description of the Universe consistent with General Relativity, viewed as the long–wavelength geometro–hydrodynamic limit of the Quantum Vacuum dynamics. The proposed model is also able to give a very simple explanation of: the equivalence between inertial and gravitational mass, the origin and dynamical behavior of dark matter and dark energy, the physical meaning of singularity in black hole, as well as to overcome some of the main difficulties of the Higgs model. Finally this model of gravity can be used as a starting point for a novel interpretation of the recently published data of BICEP2 radio telescope about the presumed indirect observation of gravitational waves.
I am not so narrow-minded as to only be discussing the alcubierre warp drive. On the other hand it has connections to propellantless propulsion. the very nature of gravity and SpaceTime itself is what's necessary for propellantless propulsion. So there is going to be some subject crosstalk. This paper looks to be an example of exactly what I'm talking about.
Quote from: dustinthewind on 09/30/2019 10:13 pmI am not so narrow-minded as to only be discussing the alcubierre warp drive. On the other hand it has connections to propellantless propulsion. the very nature of gravity and SpaceTime itself is what's necessary for propellantless propulsion. So there is going to be some subject crosstalk. This paper looks to be an example of exactly what I'm talking about. No, that paper does not appear to have any relevance to the thread. Just because it has the words "quantum vacuum" in it does not make it relevant. It therefore also does not justify your change of subject.There are questions I could ask about what that paper actually shows and if its results are valid (the citation list is not promising, mostly just the authors citing themselves,) but again that paper, like everything else in the last few posts is not relevant to this thread.
Equipartition of energy in the horizon degrees of freedom and the emergence of gravityT PadmanabhanModern Physics Letters A 25 (14), 1129-1136, 2010It is possible to provide a physical interpretation for the field equations of gravity based on a thermodynamical perspective. The virtual degrees of freedom associated with the horizons, as perceived by the local Rindler observer, play a crucial role in this approach. In this context, the relation S = E/2T between the entropy (S), active gravitational mass (E) and temperature (T) — obtained previously in gr-qc/0308070 [CQG, 21, 4485 (2004)] — can be reinterpreted as the law of equipartition E = (1/2) nkBT where is the number (density) of microscopic horizon degrees of freedom in an area ΔA. Conversely, one can use the equipartition argument to provide a thermodynamic interpretation of gravity, even in the nonrelativistic limit. These results emphasize the intrinsic quantum nature of all gravitational phenomena and diminishes the distinction between thermal phenomena associated with local Rindler horizons and the usual thermodynamics of macroscopic bodies in non-inertial frames. Just like the original thermodynamic interpretation, these results also hold for a wide class of gravitational theories like the Lanczos–Lovelock models.
Entropy density of spacetime and the Navier-Stokes fluid dynamics of null surfacesT. Padmanabhan(Submitted on 1 Dec 2010)It has been known for several decades that Einstein's field equations, when projected onto a null surface, exhibits a structure very similar to non-relativistic Navier-Stokes equation. I show that this result arises quite naturally when gravitational dynamics is viewed as an emergent phenomenon. Extremising the spacetime entropy density associated with the null surfaces leads to a set of equations which, when viewed in the local inertial frame, becomes identical to the Navier-Stokes (NS) equation. This is in contrast with the usual description of Damour-Navier-Stokes (DNS) equation in a general coordinate system, in which there appears a Lie derivative rather than convective derivative. I discuss this difference, its importance and why it is more appropriate to view the equation in a local inertial frame. The viscous force on fluid, arising from the gradient of the viscous stress-tensor, involves the second derivatives of the metric and does not vanish in the local inertial frame while the viscous stress-tensor itself vanishes so that inertial observers detect no dissipation. We thus provide an entropy extremisation principle that leads to the DNS equation, which makes the hydrodynamical analogy with gravity completely natural and obvious. Several implications of these results are discussed.
Quote from: meberbs on 09/30/2019 11:04 pmQuote from: dustinthewind on 09/30/2019 10:13 pmI am not so narrow-minded as to only be discussing the alcubierre warp drive. On the other hand it has connections to propellantless propulsion. the very nature of gravity and SpaceTime itself is what's necessary for propellantless propulsion. So there is going to be some subject crosstalk. This paper looks to be an example of exactly what I'm talking about. No, that paper does not appear to have any relevance to the thread. Just because it has the words "quantum vacuum" in it does not make it relevant. It therefore also does not justify your change of subject.There are questions I could ask about what that paper actually shows and if its results are valid (the citation list is not promising, mostly just the authors citing themselves,) but again that paper, like everything else in the last few posts is not relevant to this thread.It has relevance because a quantum vacuum plasma thruster would require knowledge of the structure and mechanism of space-time. I understand the guy doesn't have very many references but it's the concept that matters. It's based on a lot of puzzle pieces that have been found that exist in the universe, and he's trying to piece it all together. Because of this he won't be the only one that's going down that path. Here's another example of a paper discussing the quantum thermodynamic properties of gravity with lots of references.
Quote from: dustinthewind on 10/05/2019 07:18 pmQuote from: meberbs on 09/30/2019 11:04 pmQuote from: dustinthewind on 09/30/2019 10:13 pmI am not so narrow-minded as to only be discussing the alcubierre warp drive. On the other hand it has connections to propellantless propulsion. the very nature of gravity and SpaceTime itself is what's necessary for propellantless propulsion. So there is going to be some subject crosstalk. This paper looks to be an example of exactly what I'm talking about. No, that paper does not appear to have any relevance to the thread. Just because it has the words "quantum vacuum" in it does not make it relevant. It therefore also does not justify your change of subject.There are questions I could ask about what that paper actually shows and if its results are valid (the citation list is not promising, mostly just the authors citing themselves,) but again that paper, like everything else in the last few posts is not relevant to this thread.It has relevance because a quantum vacuum plasma thruster would require knowledge of the structure and mechanism of space-time. I understand the guy doesn't have very many references but it's the concept that matters. It's based on a lot of puzzle pieces that have been found that exist in the universe, and he's trying to piece it all together. Because of this he won't be the only one that's going down that path. Here's another example of a paper discussing the quantum thermodynamic properties of gravity with lots of references. Based on the definition for relevance you just provided, there are several million papers that should be posted to this thread. Allow me to go write a script to find all of them and post links and quotes from the abstracts. (Note: that would obviously get me banned, and I am not doing that, but you are effectively just doing that manually at a slow pace.)0Alternatively, you could accept that the theory proposed in this thread is not based on quantum gravity, so random papers on quantum gravity are off topic, and your assertion that "knowledge of the structure and mechanism of spacetime" is needed, amounts to nothing but fancy words that are not true. (And even if the thread was on quantum gravity, not all quantum gravity papers would be relevant.)Also, the most recent paper you provided is not "another example," but something completely different from the previous paper, yet still not relevant to this thread.
Quote from: dustinthewind on 09/28/2019 06:52 pmThis citation kind of touches on the subject. I would like to find something newer on it but haven't had the time. There is a lot of references though. Touches on what? This does nothing to support the nonsense you kept repeating about "thermal" being related to time....