General relativistic energy conditions: The Hubble expansion in the epoch of galaxy formation
TLDR
In this paper, the authors show that the strong energy condition (SEC) is violated at some time between the epoch of galaxy formation and the present, which implies that no possible combination of {ital {open_quotes}normal{close-quotes}} matter is capable of fitting the observational data.Abstract:
The energy conditions of Einstein gravity (classical general relativity) are designed to extract as much information as possible from classical general relativity without enforcing a particular equation of state for the stress energy. This systematic avoidance of the need to specify a particular equation of state is particularly useful in a cosmological setting {emdash} since the equation of state for the cosmological fluid in a Friedmann-Robertson-Walker-type universe is extremely uncertain. I shall show that the energy conditions provide simple and robust bounds on the behavior of both the density and look-back time as a function of redshift. I shall show that current observations {ital suggest} that the so-called {ital strong energy condition} (SEC) is violated at some time between the epoch of galaxy formation and the present. This implies that no possible combination of {ital {open_quotes}normal{close_quotes}} matter is capable of fitting the observational data. {copyright} {ital 1997} {ital The American Physical Society}read more
Citations
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Journal ArticleDOI
Energy conditions inf(R)gravity
TL;DR: The null and strong energy conditions in this framework are derived from Raychaudhuri's equation along with the requirement that gravity is attractive, whereas the weak and dominant energy conditions are stated from a comparison with the energy conditions that can be obtained in a direct approach via an effective energymomentum tensor for gravity.
Journal ArticleDOI
Energy conditions in f(R) gravity
TL;DR: The null and strong energy conditions in this framework are derived from Raychaudhuri's equation along with the requirement that gravity is attractive, whereas the weak and dominant energy conditions are stated from a comparison with the energy conditions that can be obtained in a direct approach via an effective energy-momentum tensor for f(R) gravity.
Journal ArticleDOI
Quintessence, superquintessence, and observable quantities in Brans-Dicke and nonminimally coupled theories
TL;DR: In this article, it was shown that superquintessence is not more than a mathematical outcome in the case of non-minimally coupled theories with coupling, and that super-clustering does not import any observable consequence.
Journal ArticleDOI
Gravitation and cosmology: Stephen Weinberg. 657 pages, diagrams, 6×9 in. New York, John Wiley & Sons, Inc., 1972. Price $18.95 (approx. £6·20).
Book ChapterDOI
A Primer on Energy Conditions
TL;DR: In this paper, a detailed analysis of the technical and conceptual character of all the standard conditions used in physics today, including examination of their consequences and the circumstances in which they are believed to be violated, is presented.
References
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TL;DR: In this article, the Robertson-Walker Metric is used to measure the radius of the Planck Epoch in the expanding universe, which is a measure of the number of atoms in the universe.
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