Thoughts on Tachyon Cosmology

Abstract

After a pedagogical review of elementary cosmology, I go on to discuss some obstacles to obtaining inflationary or accelerating universes in M/String Theory. In particular, I give an account of an old No-Go Theorem to this effect. I then describe some recent ideas about the possible rôle of the tachyon in cosmology. I stress that there are many objections to a naive inflationary model based on the tachyon, but there remains the possiblity that the tachyon was important in a possible pre-inflationary Open-String Era preceding our present Closed String Era.

34 pages, no figures. This is the written version of a lecture delivered at the Workshop on the Quantum Structure of Spacetime and the Geometric Nature of Fundamental Interactions held in Leuven from Sept 13th to Sept 19th(2002) which is to appear in the Proceedings in a special issue of Quantum and Classical Gravity

References in corpus (8)

• Can the Chaplygin gas be a plausible model for dark energy?
• Celestial Mechanics, Conformal Structures, and Gravitational Waves
• Tachyon Condensates, Carrollian Contraction of Lorentz Group, and Fundamental Strings
• The Maximum Tension Principle in General Relativity
• (Non-)Abelian Gauged Supergravities in Nine Dimensions
• Rolling Tachyons in String Cosmology
• Energy dominance and the Hawking Ellis vacuum conservation theorem
• Chronology Protection in Generalized Godel Spacetime

Cited by in corpus (154)

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• Vacuum Fluctuations of Energy Density can lead to the observed Cosmological Constant
• Tachyon dark energy models: dynamics and constraints
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• Theorems on existence and global dynamics for the Einstein equations
• Slow-roll parameters in braneworld cosmologies
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• Stability properties of some perfect fluid cosmological models
• Dynamics in Nonlocal Cosmological Models Derived from String Field Theory
• Carroll symmetry of plane gravitational waves
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• Phantom Matter and the Cosmological Constant
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• de Sitter Vacua in the String Landscape
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• Anti-D3 branes and moduli in non-linear supergravity
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• Aspects of Quantum Gravity in de Sitter Spaces
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• Why Does Gravity Ignore the Vacuum Energy?
• Inflation from D3-brane motion in the background of D5-branes
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• Heterotic Black Horizons
• Late-time Cosmic Acceleration from Compactification
• de Sitter Space as a Glauber-Sudarshan State
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• Four-dimensional de Sitter space is a Glauber-Sudarshan state in string theory
• Second-Order Corrections to the Power Spectrum in the Slow-Roll Expansion with a Time-Dependent Sound Speed
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• First-order formalism for dark energy and dust
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• Finite N effects on the collapse of fuzzy spheres
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• Holographic Dark Energy Model and Scalar-Tensor Theories
• Constraints and Horizons for de Sitter with Extra Dimensions
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• The Equation of State of an Interacting Tachyon
• Inflation conditions for non-BPS D-branes