Slashdot Mirror
Can We Test the Speed of Light Using 'Lensing' from Supernovae? (arxiv.org)
Long-time Slashdot reader RockDoctor writes: One of the key assumptions of Relativity — both Special and General — is that the speed of light is a constant in all non-accelerating reference frames. As a key assumption, it is also one of the things that gets the kooks, wingnuts and fanatics all riled up, because they have proven that it's wrong, though those pesky scientists refuse to listen to their spittle-flecked presentations.
Back in the real world, real scientists also wonder if the assumption is justified, then try to work out how to test it. One idea for performing this test has just been published — that of using the gravitational lensing of distant supernovae to try to interrogate the speed of light in the distant past.
When a (relatively) nearby galaxy lenses a (relatively) distant galaxy, it is common for multiple images to be formed. If a supernova occurs in the distant galaxy, then supernova images will be seen in the different images, but typically at different times (on Earth) because the light paths from different images are of different lengths, and were of different lengths in the past.
The Chinese-Polish team of authors have studied the possibilities of making such observations and suggest that the LSST (Large Synoptic Survey Telescope, "a wide-field survey reflecting telescope with an 8.4-meter primary mirror, currently under construction, that will photograph the entire available sky every few nights") should detect several thousand gravitationally-lensed distant quasars, and so yield around 50 gravitationally-lensed distant supernovas per year. This is estimated to "produce robust constraints on the speed of light at the level of delta-c/c;= 0.005" (half a percent) in a decade of operations.
Which will shut the wingnuts, lunatics and kooks up. Not.At.All.
Back in the real world, real scientists also wonder if the assumption is justified, then try to work out how to test it. One idea for performing this test has just been published — that of using the gravitational lensing of distant supernovae to try to interrogate the speed of light in the distant past.
When a (relatively) nearby galaxy lenses a (relatively) distant galaxy, it is common for multiple images to be formed. If a supernova occurs in the distant galaxy, then supernova images will be seen in the different images, but typically at different times (on Earth) because the light paths from different images are of different lengths, and were of different lengths in the past.
The Chinese-Polish team of authors have studied the possibilities of making such observations and suggest that the LSST (Large Synoptic Survey Telescope, "a wide-field survey reflecting telescope with an 8.4-meter primary mirror, currently under construction, that will photograph the entire available sky every few nights") should detect several thousand gravitationally-lensed distant quasars, and so yield around 50 gravitationally-lensed distant supernovas per year. This is estimated to "produce robust constraints on the speed of light at the level of delta-c/c;= 0.005" (half a percent) in a decade of operations.
Which will shut the wingnuts, lunatics and kooks up. Not.At.All.
I can't tell if you're being sarcastic, or if you're really so stupid as to think Sheldrake is anything more than a psuedo science conman.
https://newrepublic.com/articl...
He's as much of a conman as those dipshits who spout the electric universe bullshit... which i'm sure we'll be seeing on this thread in no time.
Fascism: An authoritarian and nationalistic right-wing system of government and social organization. See also: NAZI's
Ok, So you're the one calling a Cambridge University researcher and seasoned, highly published professor a conman. He's simply found data and asked the question. Why doesn't it jive with our models of how the universe works????? hmmmmm???? It's a worthy question. Instead of sending ad hominem attacks, why don't you take a more erudite path of considering the question?
Rupert Sheldrake is a biologist and author of more than 85 scientific papers and 13 books. He was among the top 100 Global Thought Leaders for 2013, as ranked by the Duttweiler Institute, Zurich, Switzerland's leading think tank.
He studied natural sciences at Cambridge University, where he was a Scholar of Clare College, took a double first class honours degree and was awarded the University Botany Prize (1963). He then studied philosophy and history of science at Harvard University, where he was a Frank Knox Fellow (1963-64), before returning to Cambridge, where he took a Ph.D. in biochemistry (1967). He was a Fellow of Clare College, Cambridge (1967-73), where he was Director of Studies in biochemistry and cell biology. As the Rosenheim Research Fellow of the Royal Society (1970-73), he carried out research on the development of plants and the ageing of cells in the Department of Biochemistry at Cambridge University. While at Cambridge, together with Philip Rubery, he discovered the mechanism of polar auxin transport.
The Science Delusion in the UK and Science Set Free in the US, examines the ten dogmas of modern science, and shows how they can be turned into questions that open up new vistas of scientific possibility. This book received the Book of the Year Award from the British Scientific and Medical Network. His most recent book Science and Spiritual Practices is about rediscovering ways of connecting with the more-than-human world through direct experience.
Rupert Sheldrake hasn't done any real science in 30 years.
Il n'y a pas de Planet B.
The speed of light is a constant, time and space change under the Lorenz contraction in a way that keep light fixed.
(Technically, light only happens to travel at C in a perfect vacuum. C is not otherwise related to light.)
It's a small world and it smells funny; I'd buy another if it wasn't for the money; Take back what I paid (SoM)