# Cosmology and the S matrix

@article{Bousso2005CosmologyAT, title={Cosmology and the S matrix}, author={Raphael Bousso}, journal={Physical Review D}, year={2005}, volume={71}, pages={064024} }

We study conditions for the existence of asymptotic observables in cosmology. With the exception of de Sitter space, the thermal properties of accelerating universes permit arbitrarily long observations, and guarantee the production of accessible states of arbitrarily large entropy. This suggests that some asymptotic observables may exist, despite the presence of an event horizon. Comparison with decelerating universes shows surprising similarities: Neither type suffers from the limitations…

## 174 Citations

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Predicting the cosmological constant from the causal entropic principle

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We compute the expected value of the cosmological constant in our universe from the causal entropic principle. Since observers must obey the laws of thermodynamics and causality, the principle…

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In the most of existing cosmological investigations, the isotropic space–time models have been considered. In the present work, we focus on beyond this limitation and discuss the influence of…

Thermodynamics of Anomaly-Driven Cosmology

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The Friedmann equations of general relativity can be derived from the first law of thermodynamics when the entropy of the apparent horizon of a spatially isotropic universe is given by the…

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- 2011

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and a thermodynamic treatment of Einstein's equations

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The dynamics of particle, event, and apparent horizons in FLRW space are discussed. The apparent horizon is trapping when the Ricci curvature is positive. This simple criterion coincides with the…

Considerations on the thermal equilibrium between matter and the cosmic horizon

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A common feature in the thermodynamic analysis of homogeneous and isotropic world models is the assumption that the temperature of the fluids inside the cosmic horizon (including dark energy)…

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