Mimicking the Big Bang (Introduction)
by David Turell 
, Thursday, August 29, 2013, 16:09 (4104 days ago)
In the lab, an ultracold experiement produces results like the cosmic microwave background noise:-http://phys.org/news/2013-08-ultracold-big-successfully-simulates-evolution.html
Big Bang an Illusion
by George Jelliss 
, Crewe, Friday, September 13, 2013, 21:15 (4089 days ago) @ David Turell
According to this latest theory the Big Bang is just an illusion-http://www.nature.com/news/did-a-hyper-black-hole-spawn-the-universe-1.13743-It's the result of a collapsing 4-dimensional star! -I suppose this is analogous to a sphere intersecting a plane and appearing to be a point expanding into a circle. Shades of Abbott's Flatland!-This gets rid of the need for inflation, which seems good to me, but on the other hand introduces an even more improbable scenario. First indications are it needs further refinement.
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GPJ
Big Bang an Illusion
by David Turell , Friday, September 13, 2013, 22:30 (4089 days ago) @ George Jelliss
According to this latest theory the Big Bang is just an illusion > > http://www.nature.com/news/did-a-hyper-black-hole-spawn-the-universe-1.13743 &a... > It's the result of a collapsing 4-dimensional star! > > I suppose this is analogous to a sphere intersecting a plane and appearing to be a point expanding into a circle. Shades of Abbott's Flatland! > > This gets rid of the need for inflation, which seems good to me, > but on the other hand introduces an even more improbable scenario. > First indications are it needs further refinement.-But all the CMB findings support inflation with very close predictions. Ev erything we find supports inflation, weird as that seems. How do you prove a universe in a membrane? Talk about counerintuative.
Big Bang an Illusion
GEORGE: According to this latest theory the Big Bang is just an illusion-http://www.nature.com/news/did-a-hyper-black-hole-spawn-the-universe-1.13743-It's the result of a collapsing 4-dimensional star! I suppose this is analogous to a sphere intersecting a plane and appearing to be a point expanding into a circle. Shades of Abbott's Flatland! This gets rid of the need for inflation, which seems good to me, but on the other hand introduces an even more improbable scenario. First indications are it needs further refinement.-DAVID: But all the CMB findings support inflation with very close predictions. Everything we find supports inflation, weird as that seems. How do you prove a universe in a membrane? Talk about counerintuative.-Have I misunderstood the article? The authors postulate "that we detect the brane's growth as cosmic expansion. "Astronomers measured that expansion and extrapolated back that the universe must have begun with a Big Bang..." (my bold)-QUOTE: "Despite the mismatch, Dvali praises the ingenious way in which the team threw out the Big Bang model. "The singularity is the most fundamental problem in cosmology and they have rewritten history so that we never encountered it," he says. Whereas the Planck results "prove that inflation is correct", they leave open the question of how inflation happened, Dvali adds. The study could help to show how inflation is triggered by the motion of the Universe through a higher-dimensional reality, he says.-Doesn't this mean that they accept inflation but they do not accept that the cause was a Big Bang? As for counterintuitive, is it any less fantastic than the theories that the universe came from nothing, or that the universe was made by an intelligence that has always existed?
Big Bang an Illusion
by David Turell , Sunday, September 15, 2013, 22:07 (4087 days ago) @ dhw
> dhw:Doesn't this mean that they accept inflation but they do not accept that the cause was a Big Bang? As for counterintuitive, is it any less fantastic than the theories that the universe came from nothing, or that the universe was made by an intelligence that has always existed?-Throw up anything against the wall and see what sticks. This junk won't go anywhere, except to earn more grant money, if available.
Big Bang an Illusion
by David Turell , Thursday, October 24, 2013, 15:52 (4049 days ago) @ David Turell
"Inflation is more of an explanation than a predictive model of our universe, says Paul Steinhardt of Princeton University. So for about a decade, he and his colleagues have advocated the cyclic universe as an alternative. In their theory, a previous universe went through a phase of slow contraction, crunching space-time. Then something reversed the process and it expanded again to make a new universe."-Anything, any weird theory to void the bang.-http://www.newscientist.com/article/mg22029402.900-no-need-for-inflation-if-cosmos-was-a-bouncing-baby.html
Big Bang: another theory
by David Turell , Friday, November 08, 2013, 02:22 (4034 days ago) @ David Turell
Cosmology considers that the universe has no center. Started with a point that banged, but with rapid inflation we have no idea where the center went. New study gets rid of a theoretical idea about the Earth being at the center:-http://www.sciencedaily.com/releases/2013/11/131107094622.htm
Big Bang: beginning a universe
by David Turell , Tuesday, December 17, 2013, 00:26 (3995 days ago) @ David Turell
A rather long summary article on the beginning:-"Any hope of us observing the ultimate origin is fading, however. Soon after Vilenkin and Mithani published their argument, physicist Leonard Susskind of Stanford University in California responded with two papers. In them, he says that a beginning, if it did indeed occur, is likely to have been so far in the past that for all practical purposes the universe has been around forever.-He argues that because space inflates exponentially, the volume of the vacuum at later times is overwhelmingly greater than at earlier times. With many more bubble universes in existence, chances are that the patch of vacuum we call home formed later on too. The true beginning is likely to have been an awfully long time ago - so far away, that no imprint on the universe has survived. "I find it a paradoxical situation to say that there must have been a beginning, but it is with certainty before any nameable time," says Susskind.-Vilenkin acknowledges this. "It's ironic," he says. "The universe may have a beginning but we may never be able to know exactly what the beginning was like."-Still, cosmologists have plenty of other big questions to keep them busy. If the universe owes its origins to quantum theory, then quantum theory must have existed before the universe. So the next question is surely: where did the laws of quantum theory come from? "We do not know," admits Vilenkin. "I consider that an entirely different question." When it comes to the beginning of the universe, in many ways we're still at the beginning."--http://www.newscientist.com/article/mg21628932.000-before-the-big-bang-something-or-nothing.html?full=true#.Uq-MevTewil-Yes, where did those pesky laws come from?
Big Bang: missing ordinary matter found
by David Turell , Wednesday, June 20, 2018, 23:57 (2348 days ago) @ David Turell
According to the theory until now 30% was missing:
https://phys.org/news/2018-06-universe-ordinary.html
"Ordinary matter, or "baryons," make up all physical objects in existence, from stars to the cores of black holes. But until now, astrophysicists had only been able to locate about two-thirds of the matter that theorists predict was created by the Big Bang.
"In the new research, an international team pinned down the missing third, finding it in the space between galaxies. That lost matter exists as filaments of oxygen gas at temperatures of around 1 million degrees Celsius, said CU Boulder's Michael Shull, a co-author of the study.
"The finding is a major step for astrophysics. "This is one of the key pillars of testing the Big Bang theory: figuring out the baryon census of hydrogen and helium and everything else in the periodic table," said Shull of the Department of Astrophysical and Planetary Sciences.
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"Researchers have a good idea of where to find most of the ordinary matter in the universe—not to be confused with dark matter, which scientists have yet to locate: About 10 percent sits in galaxies, and close to 60 percent is in the diffuse clouds of gas that lie between galaxies.
"In 2012, Shull and his colleagues predicted that the missing 30 percent of baryons were likely in a web-like pattern in space called the warm-hot intergalactic medium (WHIM). Charles Danforth, a research associate in APS, contributed to those findings and is a co-author of the new study.
"To search for missing atoms in that region between galaxies, the international team pointed a series of satellites at a quasar called 1ES 1553—a black hole at the center of a galaxy that is consuming and spitting out huge quantities of gas. "It's basically a really bright lighthouse out in space," Shull said.
"Scientists can glean a lot of information by recording how the radiation from a quasar passes through space, a bit like a sailor seeing a lighthouse through fog. First, the researchers used the Cosmic Origins Spectrograph on the Hubble Space Telescope to get an idea of where they might find the missing baryons. Next, they homed in on those baryons using the European Space Agency's X-ray Multi-Mirror Mission (XMM-Newton) satellite.
"The team found the signatures of a type of highly-ionized oxygen gas lying between the quasar and our solar system—and at a high enough density to, when extrapolated to the entire universe, account for the last 30 percent of ordinary matter.
"'We found the missing baryons," Shull said.
"He suspects that galaxies and quasars blew that gas out into deep space over billions of years. Shull added that the researchers will need to confirm their findings by pointing satellites at more bright quasars."
Comment: what supports a theory is making predictions that can be then proven by research.