Fundamental Aspects of the Expansion of the Universe and Cosmic Horizons

Details Fundamental Aspects of the Expansion of the Universe and Cosmic Horizons Fundamental Aspects of the Expansion of the Universe and Cosmic Horizons

2004-02-12

arxiv.org/abs/astro-ph/0402278v1

Astronomy and Astrophysics

Astrophysics

Ph.D. thesis, 154 pages, 45 figures

Scientific paper

In the context of the new standard LambdaCDM cosmology we resolve conflicts in the literature regarding fundamental aspects of the expansion of the universe and cosmic horizons and we link these concepts to observational tests. We derive the dynamics of a non-comoving galaxy and use this to demonstrate the counter-intuitive result that objects at constant proper distance can have a non-zero redshift. Receding galaxies can be blueshifted and approaching galaxies can be redshifted, even in an empty universe for which one might expect special relativity to apply. We then test the generalized second law of thermodynamics (GSL) and its extension to incorporate cosmological event horizons. In spite of the fact that cosmological horizons do not generally have well-defined thermal properties, we find that the GSL is satisfied for a wide range of models. We explore in particular the relative entropic 'worth' of black hole versus cosmological horizon area. An intriguing set of models show an apparent entropy decrease but we anticipate this apparent violation of the GSL will disappear when solutions are available for black holes embedded in arbitrary backgrounds. Recent evidence suggests a small increase in the fine structure constant (alpha =e^2/hbar c) over cosmological time scales. This raises the question of which fundamental quantities are truly constant and which might vary. We show that black hole thermodynamics may provide a means to discriminate between alternative theories invoking varying constants, because some variations in the fundamental 'constants' could lead to a violation of the generalized second law of thermodynamics.

Affiliated with

Also associated with

No associations

Rating

Fundamental Aspects of the Expansion of the Universe and Cosmic Horizons does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Fundamental Aspects of the Expansion of the Universe and Cosmic Horizons, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fundamental Aspects of the Expansion of the Universe and Cosmic Horizons will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-451436