...Andrea Alù and colleagues at the University of Texas at Austin and City University of New York have shown that two nonmagnetic isolators can be combined to produce a device that transmits a signal almost perfectly in one direction, but has near-zero transmission in the opposite direction.
The cosmic radio-frequency spectrum is expected to show a strong absorption signal corresponding to the 21-centimetre-wavelength transition of atomic hydrogen around redshift 20, which arises from Lyman-α radiation from some of the earliest stars. By observing this 21-centimetre signal—either its sky-averaged spectrum or maps of its fluctuations, obtained using radio interferometers—we can obtain information about cosmic dawn, the era when the first astrophysical sources of light were formed. The recent detection of the global 21-centimetre spectrum reveals a stronger absorption than the maximum predicted by existing models, at a confidence level of 3.8 standard deviations. Here we report that this absorption can be explained by the combination of radiation from the first stars and excess cooling of the cosmic gas induced by its interaction with dark matter. Our analysis indicates that the spatial fluctuations of the 21-centimetre signal at cosmic dawn could be an order of magnitude larger than previously expected and that the dark-matter particle is no heavier than several proton masses, well below the commonly predicted mass of weakly interacting massive particles. Our analysis also confirms that dark matter is highly non-relativistic and at least moderately cold, and primordial velocities predicted by models of warm dark matter are potentially detectable. These results indicate that 21-centimetre cosmology can be used as a dark-matter probe.
Basically the emdrive is a microwave fabry-perot interferometer.
Pertinent image from the paper. The gain medium is Neodymium-doped yttrium orthovanadate crystal. The cavity is 5cm in length, with two highly reflecting mirrors at each end.
A few more examples of the power action of toroidal gravitational waves are given in my essay (https://fqxi.org/community/forum/topic/2806). With the help of the well-known photos from the NASA gallery, the mechanism of the formation of force formation with the help of toroidal gravitational waves, the effect of which is observed on the rings of Saturn and on comets, is visually shown.
give rise to unfounded generalizations
... another team made up of a small army of physicists used the burst of gamma rays captured from last month's neutron star collision to come up with their own estimate.Their method was a little more precise.Ok, a whole lot more precise.They found the difference between the lightning flash of the gamma ray burst and the thunderclap of the gravitational wave was extremely close - within -3 x 10^-15 and 7 x 10^-16 of c. Close enough to call it a tie, really.
Quote from: Monomorphic on 03/03/2018 09:05 pmPertinent image from the paper. The gain medium is Neodymium-doped yttrium orthovanadate crystal. The cavity is 5cm in length, with two highly reflecting mirrors at each end.Just an amazing development! Can’t speak to the theory or the fabrication difficulty of the medium + mirrors but I have to say it would be so good to get out of the micro newton/small vacuum chamber era to something that produces a nice solid thrust signal!Needless to say that if this works at anywhere near the thrust levels projected here then the theoretical cat is definitely out of the bag with respect to overunity energy production, etc. with the attendant implications for theoretical physics.Very early days here but it’s great that folks are reaching out for funding so we may not have to wait too long for confirmation or falsification of this approach.
In this style, they write only when there are no arguments left.
You know perfectly well that we will never understand each other.
It's like having a useless dialogue between a believer and an atheist. Any attempt to explain one or another position, in the end, will always be reduced to one question, you believe in the ideal properties of matter and fields or do not believe.
You believe in ideal properties and abstractions of mathematics and so you believe in general relativity and causeless quantum mechanics.
Then I remembered that redshifts are experienced by photons that propagate from the Sun. Those. photons are attracted to the Sun and experience resistance. Why does Stephen Hawking not mention this redshift mechanism?
Did he forget what he said a minute ago about the lack of ideal properties and explain how photons spread in space for many billions of years, carrying the realy big energy of photons, without losing energy?
We know that photons do not exhibit ballistic properties, but their propagation velocity in space is constant. Therefore, synchronization of the speed requires interaction with the luminiferous medium of the physical vacuum, which leads to energy losses and a red shift of photons with the Hubble parameter.
Only experiments will judge us.
We need to focus on the experiments and understand the work of EM Drive, until they are closed, due to the negative results of EM Drive work in outer space.
This seems a bit too good to be true. I can't believe such a small simple device with so limited power could generate so much force (look at the predicted propulsive force given for a 1 cm diameter small end, and a 100 W input power, according to MiHsC). Multijoule-terawatt-class Nd:glass lasers have been extensively tested back in the mid '70s notably at the LLNL (with Cyclops and Janus, then Argus, Shiva, Nova…). Those setups involved high-precision manufacturing and positioning of every elements. One little dust at such high power and glasses would explode (it happened). If an asymmetry in diameter between two semi-reflecting mirrors produced so much anomalous forces, wouldn't it have been noticed in the various experiments ran accross many decades?OR as the predicted anomalous force intensity is logarithmic according to Taylor's diagrams, and the Nd:glass so precisely symmetrically manufactured for the high power experiments, any anomalous force never really showed up?Is someone on these boards aware of any laser experiment involving asymmetric AND convex/concave mirrors done in the past, like Taylor's proposal? Whatever, I hope this experiment will be done, it seems very accessible for any serious lab like TU Dresden. Martin Tajmar already expressed interest.
Hi guys,I spotted today this article. I wonder if ESA nailed it! (it is not EmDrive or at least I think..)ESA test-fires radical ‘air-breathing’ ion thruster that could keep satellites in low orbit for YEARS without propellanthttp://www.dailymail.co.uk/sciencetech/article-5470021/ESA-test-fires-radical-air-breathing-electric-ion-thruster.htmlIt was posted yesterday.Also very interesting posts here lately. You guys serioulsy know where to dig for good information .
Collect and compress the air molecules to a level where thruster ignition could take place.
This seems a bit too good to be true. I can't believe such a small simple device with so limited power could generate so much force (look at the predicted propulsive force given for a 1 cm diameter small end, and a 100 W input power, according to MiHsC).