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Subject: Space Watch

obi_jon 21.01.19 - 02:56pm
I managed to see the start of it. The moon was about halfway in shadow before it completely clouded over, so I went to bed. * +

shadow27 23.01.19 - 07:04am
Like a mountain looming over a calm lake, it seems the universe may once have had a perfect mirror image. That's the conclusion a team of Canadian scientists reached after extrapolating the laws of the universe both before and afterthe Big Bang.
Physicists have a pretty good idea of the structure of the universe just a couple of seconds after the Big Bang, moving forward to today. In many ways, fundamental physics then worked as it does today. But experts have argued for decades about what happened in that first moment - when thetiny, infinitely dense speck of matter first expanded outward - often presuming that basic physics were somehow altered.. * +

shadow27 23.01.19 - 07:07am
Researchers Latham Boyle, Kieran Finn and Neil Turok at the Perimeter Institute for Theoretical Physics in Waterloo, Ontario, have turned this idea on its head by assuming the universe has always been fundamentally symmetrical and simple, then mathematically extrapolating into that first moment after the Big Bang.
That led them to propose a previous universe that was a mirror image of our current one, except with everything reversed.Time went backward and particles were antiparticles. It's not the first time physicists have envisioned another universe before the Big Bang, but those were always seen as separate universes much like our own.
''Instead of saying there was a different universe before the bang,'' Turok told Live Science, ''we're saying that the universe before the bang is actually, in some sense, an image of the universe after the bang.'' * +

shadow27 23.01.19 - 07:09am
''It's like our universe today were reflected through the Big Bang. The period before the universe was really the reflection through the bang,'' Boyle said.
Imagine cracking an egg in this anti-universe. First, it would be made entirely ofnegatively charged antiprotons and positively charged anti-electrons.
Secondly, from our perspective in time, it would seem to go from a puddle of yolk to a cracked egg to an uncracked egg to inside the chicken. Similarly, the universe would go from exploding outward to a Big Bang singularity and then exploding into our universe. * +

shadow27 23.01.19 - 07:10am
Those Red Dwarf guys were right.. * +

shadow27 23.01.19 - 08:04am
Continued:

But seen another way, both universes were created at the Big Bang and exploded simultaneously backward and forward in time. This dichotomy allows for some creative explanations to problems that have stumped physicists for years. For one, it would make the first second of the universe fairly simple, removing the necessity for the bizarre multiverses and dimensions experts have used for three decades to explain some of the stickier aspects of quantum physics and the Standard Model, which describes the zoo of subatomic particles that make up our universe.
''Theorists invented grand unified theories, which had hundreds of new particles, which have never been observed -supersymmetry, string theory with extra dimensions, multiverse theories. People just basically kept on going inventing stuff. No observational evidence has emerged for any of it.'' Turok said. * +

shadow27 23.01.19 - 08:06am
Similarly, this theory would offer a much simpler explanation for dark matter, Boyle said.
''Suddenly, when you take this symmetric, extended view of space/time,'' Boyle told Live Science, ''one of the particles that we already think exists one of the so-called right-handed neutrinos becomes a very neat dark-matter candidate. And you don't need to invoke other, more speculative particles.'' (Boyle is referring to a theoretical sterile neutrino, which would pass through ordinary matter without interacting with it at all.)
The scientists say this new theory grew out of a dissatisfaction with the bizarre add-ons proposed by physicists in recent years. Turok himself helped develop such explanations but felt a deep desire for a simpler explanation of the universe and the Big Bang. They also say this new theory has the benefit of being testable. Which will be crucial in winning over doubters. * +

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