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wolram
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I have been looking for literature on this question but can not find any, will a (bounce) retain all the information of the previous galaxy ?
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Thank you for your reply Chonos, what i do not know is how dense a collapsing universe would become, would it have to go to a BH state or could it bounce at some other density, if it had to go the BH state would our particle zoo be the same , are they natural in any universe.?Chronos said:On a related note, it is unclear whether a bouncing universe can wipe the entropy slate clean with each bang cycle. Efforts have been made to address this issue in the literature, but, they have thus far been unconvincing, e.g., http://www.nature.com/news/2007/070219/full/news070219-4.html
slatts said:the de Sitter space that most of the cosmologies I've seen described are supposed to occur in actually requires a contracting phase, which is supposed to precede an expanding phase!
slatts said:the "inflating phase", in "the full de Sitter spacetime", "must be preceded by a contracting phase, which is not part of an inflationary model"
slatts said:with quantum theories, the theorists' absolute view of time
PeterDonis said:I'm not sure what you mean by this. Quantum field theory in curved spacetime certainly does not require or assume an "absolute" view of time; in fact, key effects, such as the Unruh effect and Hawking radiation, depend on observers in different states of motion having different notions of time.
slatts said:in GRW, "the state of each particle has a fixed probability per unit time of spontaneously collapsing to a localized position", and, since it's hard to see what
"unit time" could possibly apply to a spacetime expanding at up to six times the speed of light
There is currently no consensus among scientists about the potential loss of information in a bouncing cosmology. Some theories suggest that information is preserved, while others propose that it may be lost during the bouncing process. More research is needed to fully understand this phenomenon.
A bouncing cosmology proposes that the universe undergoes a series of expansions and contractions, while the Big Bang theory suggests a single rapid expansion. Additionally, a bouncing cosmology does not have a singularity, which is a point of infinite density, as the Big Bang theory does.
Currently, there is no direct evidence for a bouncing cosmology. However, some observations of the cosmic microwave background radiation, the oldest light in the universe, suggest that the universe may have undergone a period of contraction before the Big Bang. Further research and observations are necessary to confirm this idea.
The bouncing cosmology is one of many theories attempting to explain the origin of the universe. While it provides an alternative to the Big Bang theory, it does not fully explain the initial conditions of the universe or the cause of the bounces. More research and evidence are needed to fully understand the origin of the universe.
The laws of physics, as we currently understand them, are still applicable in a bouncing cosmology. However, some theories propose that certain laws may break down during the bouncing process. This concept is still being explored and is an area of ongoing research in the field of cosmology.