Entropy Bounds and String Cosmology

Abstract

After discussing some old (and not-so-old) entropy bounds both for isolated systems and in cosmology, I will argue in favour of a "Hubble entropy bound" holding in the latter context. I will then apply this bound to recent developments in string cosmology, show that it is naturally saturated throughout pre-big bang inflation, and claim that its fulfilment at later times has interesting implications for the exit problem of string cosmology.

Latex file, 11 pages, 3 figures, Talk given in honour of F. Englert, Brussels, March 1999

References in corpus (7)

• A Covariant Entropy Conjecture
• Cosmic Holography
• Holography and Cosmology
• Holography, Cosmology and the Second Law of Thermodynamics
• Pre-bangian origin of our entropy and time arrow
• The Generalized Second Law of Thermodynamics in Cosmology
• Holographic Principle and String Cosmology

Cited by in corpus (17)

• The holographic principle
• A Causal Entropy Bound
• Holography, UV/IR Relation, Causal Entropy Bound and Dark Energy
• Holography in a Radiation-dominated Universe with a Positive Cosmological Constant
• CFT, Holography, and Causal Entropy Bound
• Causal Entropy Bound for Non-Singular Cosmologies
• Of Bounces, Branes and Bounds
• Role of the cosmological constant in the holographic description of the early universe
• Dualities of the entropy bound
• Stephani Cosmology: Entropically Viable But Observationally Challenged
• A not so brief commentary on cosmological entropy bounds
• Holographic entropy bounds in the inflationary universe
• A maximal-entropy initial state of the Universe as a microscopic description of inflation
• Encoding the scaling of the cosmological variables with the Euler Beta function
• Holographic temperature bound in the slow-roll inflation
• A New Census of the Universe's Entropy
• Entropy Bounds and Holographic Dark Energy: Conflicts and Consensus