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

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    Cyclic Universe
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SUMMARY

The discussion centers on the cyclic universe model proposed by Paul Steinhardt and Neil Turok, which suggests that the universe undergoes an infinite series of expansions and contractions. This model addresses the dark energy problem in cosmology by positing that the universe expands from an initial state of infinite density, similar to the Big Bang, and subsequently contracts back to infinite density. Key questions raised include the nature of positive vacuum energy signatures observed from distant galaxies, particularly in relation to the Milky Way. The cyclic model serves as a theoretical framework for understanding cosmological phenomena and is motivated by analogies to quantum chromodynamics (QCD) phase transitions.

PREREQUISITES
  • Understanding of cosmological models, specifically the cyclic universe theory.
  • Familiarity with dark energy concepts and their implications in cosmology.
  • Knowledge of quantum chromodynamics (QCD) and its relevance to cosmological phenomena.
  • Basic grasp of vacuum energy and its role in the universe's expansion.
NEXT STEPS
  • Research the implications of dark energy on cosmic expansion and contraction.
  • Explore the QCD phase transition and its analogies to cosmological models.
  • Study the "phantom energy problem" and its significance in modern cosmology.
  • Examine the historical context and development of the cyclic universe model since its proposal in 1999.
USEFUL FOR

Astronomers, cosmologists, and theoretical physicists interested in advanced cosmological models and the nature of dark energy will benefit from this discussion.

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?
 
Astronomy news on Phys.org
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.
 

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