Universe Models with a Variable Cosmological "Constant" and a "Big Bounce"
Hongya Liu,Paul S. Wesson +1 more
TLDR
In this paper, the authors present a rich class of exact solutions which contain radiation-dominated and matter-dominated models for the early and late universe, including a variable cosmological constant which is derived from a higher dimension and manifests itself in spacetime as an energy density for the vacuum.Abstract:
We present a rich class of exact solutions which contains radiation-dominated and matter-dominated models for the early and late universe. They include a variable cosmological ``constant'' which is derived from a higher dimension and manifests itself in spacetime as an energy density for the vacuum. This is in agreement with observational data and is compatible with extensions of general relativity to string and membrane theory. Our solutions are also typified by a non-singular ``big bounce'' (as opposed to a singular big bang), where matter is created as in inflationary cosmology.read more
Citations
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Effects of a soft x-ray background on structure formation at high redshift
TL;DR: In this article, the effects of a soft X-ray background, that could have been produced by an early generation of mini-quasars, on the subsequent cooling and collapse of high redshift pregalactic clouds were investigated.
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Application of the Campbell-Magaard theorem to higher dimensional physics
Sanjeev S. Seahra,Paul S. Wesson +1 more
TL;DR: In this article, the Campbell-Magaard theorem was extended to n dimensions and its application to current theories that postulate that our universe is a four-dimensional hypersurface within a five-dimensional manifold, such as space-time-matter (STM) theory and the Randall and Sundrum (RS) braneworld scenario.
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COSMOCR: A numerical code for cosmic ray studies in computational cosmology
TL;DR: In this paper, a numerical code for the investigation of cosmic ray related studies in computational cosmology is presented, which consists of a conservative, finite volume method with a power-law sub-grid model in momentum space.
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Astrophysics in 2002
TL;DR: This has been the Year of the Baryon as mentioned in this paper, which has seen the back of the Sun, a possible solution to the problem of ejection of material by Type II Supernovae, the production of R Coronae Borealis stars (previously owned baryons), and perhaps found the missing satellite galaxies (whose failing is that they have no baryon).
References
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The Cosmological Constant Problem
TL;DR: In this article, five different approaches to the cosmological constant problem are described, and a brief review of the history of this problem is given. But none of the approaches are considered in this paper.
Book
Introduction To Supersymmetry And Supergravity
TL;DR: The second edition as discussed by the authors contains a substantial amount of new material especially on two-dimensional supersymmetry algebras, their irreducible representations as well as rigid and local (i.e. supergravity) theories of 2-dimensional superymmetry both in x-space and superspace.
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Creation of Universes from Nothing
TL;DR: If inflation is eternal, then the beginning of our local universe, about 14 billion years ago, was preceded by an unknown number of ancestor bubble universes as discussed by the authors, which is known as the ancestor bubble universe.
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