Emergence of Fluctuations from a Tachyonic Big Bang

Abstract

It has recently been speculated that the end state of a collapsing universe is a tachyonic big crunch. The time reversal of this process would be the emergence of an expanding universe from a tachyonic big bang. In this framework, we study the emergence of cosmological fluctuations. In particular, we compare the amplitude of the perturbations at tne end of the tachyon phase with what would be obtained assuming the usual vacuum initial conditions. We find that cosmological fluctuations emerge in a thermal state. We comment on the relation to the trans-Planckian problem of inflationary cosmology.

arXiv comment8pg, RevTeX4, 1 fig, v2. added refs, v3. added small clarification, 1 ref

References in corpus (35)

• The Trans-Planckian Problem of Inflationary Cosmology
• A note on inflation and transplanckian physics
• The Robustness of Inflation to Changes in Super-Planck-Scale Physics
• Inflation as a Probe of Short Distance Physics
• Producing a Scale-Invariant Spectrum of Perturbations in a Hagedorn Phase of String Cosmology
• Inflation with a Planck-scale frequency cutoff
• Perturbation spectrum in inflation with cutoff
• On the Dependence of the Spectra of Fluctuations in Inflationary Cosmology on Trans-Planckian Physics
• Trans-Planckian dispersion and scale-invariance of inflationary perturbations
• Noncommutative Spacetime, Stringy Spacetime Uncertainty Principle, and Density Fluctuations
• Timelike Boundary Liouville Theory
• Robustness of the inflationary perturbation spectrum to trans-Planckian physics
• Imprints of Short Distance Physics On Inflationary Cosmology
• Remarks on Inflation and Noncommutative Geometry
• String Gas Cosmology and Structure Formation
• Are Inflationary Predictions Sensitive to Very High Energy Physics?
• Cosmological perturbations and short distance physics from Noncommutative Geometry
• Open String Creation by S-Branes
• S-Brane Thermodynamics
• Trans-Planckian Effects in Inflationary Cosmology and the Modified Uncertainty Principle
• Cosmological Perturbations from a New-Physics Hypersurface
• Back-Reaction and the Trans-Planckian Problem of Inflation Revisited
• The Tachyon at the End of the Universe
• Is there an imprint of Planck scale physics on inflationary cosmology?
• Minimal modifications of the primordial power spectrum from an adiabatic short distance cutoff
• Closed String Tachyon Condensation: An Overview
• Trans-Planckian Particle Creation in Cosmology and Ultra-High Energy Cosmic Rays
• Dimension-changing exact solutions of string theory
• A comment on trans-Planckian physics in inflationary universe
• Inflation and String Cosmology
• The cosmological vacuum ambiguity, effective actions, and transplanckian effects in inflation
• Inflationary String Theory?
• On Minisuperspace Models of S-branes
• Towards A Nonsingular Tachyonic Big Crunch
• The Nothing at the Beginning of the Universe Made Precise

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• A classical bounce: constraints and consequences
• Inflation with a Negative Cosmological Constant
• Cyclic Inflation
• Exciting gauge field and gravitons in a brane-anti-brane annihilation
• Cosmology of the closed string tachyon
• Large Radius Hagedorn Regime in String Gas Cosmology
• Tachyon - Dilaton driven Inflation as an alpha' - non-perturbative solution in First Quantized String Cosmology