Is the Universe Undergoing an Infinite Series of Expansions and Contractions?

In summary: The model suggests that local positive vacuum energies are present in our universe, but are much smaller in magnitude compared to those needed for inflation. It also offers a potential solution to the dark energy problem, as the cyclic nature of the universe allows for a constant dark energy component over time. The model is still hypothetical and requires further testing and research. In summary, the cyclic model is a cosmological model that proposes a cyclic pattern of expansion and contraction for the universe, motivated by the QCD phase transition and offering a potential solution to the dark energy problem. It suggests that local positive vacuum energies are present in our universe, but at a much smaller magnitude compared to those needed for inflation.
  • #1
ranyart
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Here is a new paper by Niel Turok and Paul J Steinhardt.

http://uk.arxiv.org/PS_cache/hep-th/pdf/0403/0403020.pdf

The initial reading makes one ask a simple question, if I was to be at a far away location, say at the QSO of farthest detected Galaxy, and I looked back to the location of Milkyway, would I detect a Positive Vacuum Energy a hundred orders of magnitude smaller than the vacuum energy needed to drive inflation?

Or would the fact I am looking at the Milkyway from across the Universe yeild different positive vacuum energy signature's.

I guess a simpler question is this, are local positive vacuum energies present in Local Space, or are they at far away locations?
 
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  • #2
The cyclic universe is a cosmological model of the universe in which the universe undergoes an infinite series of expansions and contractions. The model is a hypothetical solution to the dark energy problem in cosmology. The cyclic model posits that the universe expands from an initial state of infinite density, analogous to the singularity of the Big Bang, into a vast space filled with a nearly-constant-density fluid of matter, analogous to the present-day universe, and then contracts again to a state of infinite density. The model is motivated by an analogy to the QCD phase transition, through the observation of dark energy being constant in time. The model is an example of a theory of everything.

The cyclic model was proposed by the physicist Paul Steinhardt and the cosmologist Neil Turok in 1999. They presented three possible motivations for the model: the "phantom energy problem", the flatness problem, and the horizon problem.
 

What is a Cyclic Universe?

A Cyclic Universe is a cosmological model that suggests the universe undergoes repeated cycles of expansion and contraction.

What is the evidence for a Cyclic Universe?

Some evidence for a Cyclic Universe includes the observed distribution of matter and energy in the universe, the cosmic microwave background radiation, and the rate of expansion of the universe.

How does a Cyclic Universe differ from the Big Bang theory?

The Big Bang theory suggests that the universe began with a single event, while the Cyclic Universe suggests that the universe has no beginning or end, but instead goes through cycles of expansion and contraction.

What causes the cycles in a Cyclic Universe?

The cause of the cycles in a Cyclic Universe is still a topic of debate among scientists. Some propose that it is due to the effects of dark energy, while others suggest it could be the result of collisions between branes in higher dimensions.

Is there any way to test the theory of a Cyclic Universe?

Currently, there is no definitive way to test the Cyclic Universe theory. However, scientists are studying the cosmic microwave background radiation and other observable phenomena in an attempt to gather more evidence and potentially find ways to test the theory.

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