141 citations · 631 across the 21 of their papers we have counts for
12 papers · 1 filter
Perturbations on and off de Sitter brane in anti-de Sitter bulk
M. Libanov, V. Rubakov
Motivated by holographic models of (pseudo)conformal Universe, we carry out complete analysis of linearized metric perturbations in the time-dependent two-brane setup of the Lykken…
Generalized Galileons: instabilities of bouncing and Genesis cosmologies and modified Genesis
M. Libanov, S. Mironov, V. Rubakov
We study spatially flat bouncing cosmologies and models with the early-time Genesis epoch in a popular class of generalized Galileon theories. We ask whether there exist solutions…
Towards conformal cosmology
M. Libanov, V. Rubakov, G. Rubtsov
Approximate de Sitter symmetry of inflating Universe is responsible for the approximate flatness of the power spectrum of scalar perturbations. However, this is not the only option…
Conformal Universe as false vacuum decay
M. Libanov, V. Rubakov
We point out that the (pseudo-)conformal Universe scenario may be realized as decay of conformally invariant, metastable vacuum, which proceeds via spontaneous nucleation and subse…
On holography for (pseudo-)conformal cosmology
M. Libanov, V. Rubakov, S. Sibiryakov
We propose a holographic dual for (pseudo-)conformal cosmological scenario, with a scalar field that forms a moving domain wall in adS_5. The domain wall separates two vacua with u…
Dynamical vs spectator models of (pseudo-)conformal Universe
M. Libanov, V. Rubakov
We discuss two versions of the conformal scenario for generating scalar cosmological perturbations: a spectator version with a scalar field conformally coupled to gravity and carry…
Scalar perturbations in conformal rolling scenario with intermediate stage
M. Libanov, S. Ramazanov, V. Rubakov
Scalar cosmological perturbations with nearly flat power spectrum may originate from perturbations of the phase of a scalar field conformally coupled to gravity and rolling down ne…
Properties of scalar perturbations generated by conformal scalar field
M. Libanov, S. Mironov, V. Rubakov
Primordial scalar perturbations may be generated when complex conformal scalar field rolls down its negative quartic potential. We begin with the discussion of peculiar infrared pr…
Cosmological density perturbations from conformal scalar field: infrared properties and statistical anisotropy
M. Libanov, V. Rubakov
We consider a scenario in which primordial scalar perturbations are generated when complex conformal scalar field rolls down its negative quartic potential. Initially, these are th…
UV stable, Lorentz-violating dark energy with transient phantom era
Maxim Libanov, Eleftherios Papantonopoulos, Valery Rubakov +2
Phantom fields with negative kinetic energy are often plagued by the vacuum quantum instability in the ultraviolet region. We present a Lorentz-violating dark energy model free fro…
More about spontaneous Lorentz-violation and infrared modification of gravity
M. V. Libanov, V. A. Rubakov
We consider a model with Lorentz-violating vector field condensates, in which dispersion laws of all perturbations, including tensor modes, undergo non-trivial modification in the…
On brane-induced gravity in warped backgrounds
S. L. Dubovsky, M. V. Libanov
We study whether modification of gravity at large distances is possible in warped backgrounds with two branes and a brane-induced term localized on one of the branes. We find that…