Identification of perturbation modes and controversies in ekpyrotic perturbations
arXiv:hep-th/0203193 · doi:10.1016/S0370-2693(02)02598-4
Abstract
If the linear perturbation theory is valid through the bounce, the surviving fluctuations from the ekpyrotic scenario (cyclic one as well) should have very blue spectra with suppressed amplitude for the scalar-type structure. We derive the same (and consistent) result using the curvature perturbation in the uniform-field (comoving) gauge and in the zero-shear gauge. Previously, Khoury et al. interpreted results from the latter gauge condition incorrectly and claimed the scale-invariant spectrum, thus generating controversy in the literature. We also correct similar errors in the literature based on wrong mode identification and joining condition. No joining condition is needed for the derivation.
5 pages, substantially revised, match with PLB version
References in corpus (14)
- The Ekpyrotic Universe: Colliding Branes and the Origin of the Hot Big Bang
- Cosmic Evolution in a Cyclic Universe
- From Big Crunch to Big Bang
- On the Generation of a Scale-Invariant Spectrum of Adiabatic Fluctuations in Cosmological Models with a Contracting Phase
- Cosmology With Negative Potentials
- Enhancement of superhorizon scale inflationary curvature perturbations
- The primordial curvature perturbation in the ekpyrotic Universe
- On the Spectrum of Fluctuations in an Effective Field Theory of the Ekpyrotic Universe
- Gauge-ready formulation of the cosmological kinetic theory in generalized gravity theories
- Passing through the bounce in the ekpyrotic models
- Cosmological structure problem of the ekpyrotic scenario
- The failure of cosmological perturbation theory in the new ekpyrotic and cyclic ekpyrotic scenarios
- Density perturbations in the Ekpyrotic Universe and string-inspired generalizations
- Non-singular big-bounces and evolution of linear fluctuations
Cited by in corpus (18)
- Inflation Dynamics and Reheating
- Lectures on string/brane cosmology
- Cosmological perturbations through a simple bounce
- Cosmological Perturbations in a Big Crunch/Big Bang Space-time
- Theoretical tools for CMB physics
- Cosmological Perturbations Through a General Relativistic Bounce
- Scalar perturbations in regular two-component bouncing cosmologies
- Regular two-component bouncing cosmologies and perturbations therein
- Construction of nonsingular cosmological solutions in string theories
- Solution of a Braneworld Big Crunch/Big Bang Cosmology
- General solution for scalar perturbations in bouncing cosmologies
- Vector fluctuations from multidimensional curvature bounces
- Evolution of linear perturbations through a bouncing world model: Is the near Harrison-Zel'dovich spectrum possible via a bounce?
- Averaged Energy Conditions and Bouncing Universes
- Flow in Cyclic Cosmology
- A primer on the ekpyrotic scenario
- Warm Ekpyrosis
- Universe bouncing its way to inflation