A critical review of classical bouncing cosmologies
D Battefeld, P Peter - Physics Reports, 2015 - Elsevier
Given the proliferation of bouncing models in recent years, we gather and critically assess
these proposals in a comprehensive review. The PLANCK data shows an unmistakably red …
these proposals in a comprehensive review. The PLANCK data shows an unmistakably red …
Ekpyrotic and cyclic cosmology
JL Lehners - Physics Reports, 2008 - Elsevier
Ekpyrotic and cyclic cosmologies provide theories of the very early and of the very late
universe. In these models, the big bang is described as a collision of branes—and thus the …
universe. In these models, the big bang is described as a collision of branes—and thus the …
Nine-year Wilkinson Microwave Anisotropy Probe (WMAP) observations: final maps and results
CL Bennett, D Larson, JL Weiland… - The Astrophysical …, 2013 - iopscience.iop.org
We present the final nine-year maps and basic results from the Wilkinson Microwave
Anisotropy Probe (WMAP) mission. The full nine-year analysis of the time-ordered data …
Anisotropy Probe (WMAP) mission. The full nine-year analysis of the time-ordered data …
New ekpyrotic cosmology
EI Buchbinder, J Khoury, BA Ovrut - Physical Review D—Particles, Fields …, 2007 - APS
In this paper, we present a new scenario of the early universe that contains a pre-big bang
ekpyrotic phase. By combining this with a ghost condensate, the theory explicitly violates the …
ekpyrotic phase. By combining this with a ghost condensate, the theory explicitly violates the …
Galileon cosmology
N Chow, J Khoury - Physical Review D—Particles, Fields, Gravitation, and …, 2009 - APS
We study the cosmology of a galileon scalar-tensor theory, obtained by covariantizing the
decoupling Lagrangian of the Dvali-Gabadadze-Poratti (DGP) model. Despite being local in …
decoupling Lagrangian of the Dvali-Gabadadze-Poratti (DGP) model. Despite being local in …
Infrared-modified gravities and massive gravitons
VA Rubakov, PG Tinyakov - Physics-Uspekhi, 2008 - iopscience.iop.org
We review some theoretical and phenomenological aspects of massive gravities in 4
dimensions. We start from the Fierz–Pauli theory with Lorentz-invariant mass terms and then …
dimensions. We start from the Fierz–Pauli theory with Lorentz-invariant mass terms and then …
Cosmological super-bounce
M Koehn, JL Lehners, BA Ovrut - Physical Review D, 2014 - APS
We study a model for a nonsingular cosmic bounce in N= 1 supergravity, based on
supergravity versions of the ghost condensate and cubic Galileon scalar field theories. The …
supergravity versions of the ghost condensate and cubic Galileon scalar field theories. The …
Supersmoothing through slow contraction
WG Cook, IA Glushchenko, A Ijjas, F Pretorius… - Physics Letters B, 2020 - Elsevier
Performing a fully non-perturbative analysis using the tools of numerical general relativity,
we demonstrate that a period of slow contraction is a “supersmoothing” cosmological phase …
we demonstrate that a period of slow contraction is a “supersmoothing” cosmological phase …
Rapidly-varying speed of sound, scale invariance and non-Gaussian signatures
J Khoury, F Piazza - Journal of Cosmology and Astroparticle …, 2009 - iopscience.iop.org
We show that curvature perturbations acquire a scale invariant spectrum for any constant
equation of state, provided the fluid has a suitably time-dependent sound speed. In order for …
equation of state, provided the fluid has a suitably time-dependent sound speed. In order for …
Cosmological perturbations through a non-singular ghost-condensate/Galileon bounce
L Battarra, M Koehn, JL Lehners… - Journal of Cosmology …, 2014 - iopscience.iop.org
We study the propagation of super-horizon cosmological perturbations in a non-singular
bounce spacetime. The model we consider combines a ghost condensate with a Galileon …
bounce spacetime. The model we consider combines a ghost condensate with a Galileon …