141 citations · 588 across the 29 of their papers we have counts for
18 papers · 1 filter
Stability of nonsingular cosmologies in Galileon models with torsion. A no-go theorem for eternal subluminality
S. Mironov, M. Valencia-Villegas
Generic models in Galileons or Horndeski theory do not have cosmological solutions that are free of instabilities and singularities in the entire time of evolution. We extend this…
DPSV trick for spherically symmetric backgrounds
S. Mironov, V. Volkova
We discuss the approach suggested by Deffayet et al. (DPSV) to analysing the linearized perturbations in Horndeski theory in the case of a static, spherically symmetric background.…
Quartic Horndeski-Cartan theories in a FLRW universe
S. Mironov, M. Valencia-Villegas
We consider the Quartic Horndeski theory with torsion on a FLRW background in the second order formalism. We show that there is a one parameter family of Quartic Horndeski Cartan L…
Stable non-singular cosmologies in beyond Horndeski theory and disformal transformations
S. Mironov, V. Volkova
In this note we collect, systemise and generalise the existing results for relations between general Horndeski theories and beyond Horndeski theories via disformal transformations…
Superluminality in DHOST theory with extra scalar
S. Mironov, V. Rubakov, V. Volkova
We consider DHOST Ia theory interacting gravitationally with an additional conventional scalar field minimally coupled to gravity. At the linearized level of perturbations about co…
Superluminality in beyond Horndeski theory with extra scalar field
S. Mironov, V. Rubakov, V. Volkova
We study the superluminality issue in beyond Horndeski theory with additional scalar field, which is minimally coupled to gravity and has no second derivatives in the Lagrangian. W…
Subluminal cosmological bounce beyond Horndeski
S. Mironov, V. Rubakov, V. Volkova
We address the issue of potential superluminal propagation of gravitational waves in backgrounds neighboring the previously suggested bounce [arXiv:1807.08361] in beyond Horndeski…
Cosmological scenarios with bounce and Genesis in Horndeski theory and beyond: An essay in honor of I.M. Khalatnikov on the occasion of his 100th birthday
S. Mironov, V. Rubakov, V. Volkova
This essay is a brief review of the recent studies of non-singular cosmological scenarios with bounce and Genesis and their stability in a subclass of scalar-tensor theories with h…
Genesis with general relativity asymptotics in beyond Horndeski theory
S. Mironov, V. Rubakov, V. Volkova
We suggest a novel version of a cosmological Genesis model within beyond Horndeski theory. It combines the initial Genesis behavior of Creminelli et al. [arXiv:1007.0027, arXiv:120…
More about stable wormholes in beyond Horndeski theory
S. Mironov, V. Rubakov, V. Volkova
It is known that Horndeski theories, like many other scalar-tensor gravities, do not support static, spherically symmetric wormholes: they always have either ghosts or gradient ins…
Towards wormhole beyond Horndeski
S. Mironov, V. Rubakov, V. Volkova
We address the issue of whether a no-go theorem for static, spherically symmetric wormholes, proven in Horndeski theories, can be circumvented by going beyond Horndeski. We show th…
Bounce beyond Horndeski with GR asymptotics and -crossing
S. Mironov, V. Rubakov, V. Volkova
It is known that beyond Horndeski theory admits healthy bouncing cosmological solutions. However, the constructions proposed so far do not reduce to General Relativity (GR) in eith…
Perturbations in generalized Galileon theories
R. Kolevatov, S. Mironov, V. Rubakov +2
We discuss the approaches by Deffayet et al. (DPSV) and Kobayashi et al. (KYY) to the analysis of linearized scalar perturbations about a spatially flat FLRW background in Horndesk…
Cosmological bounce and Genesis beyond Horndeski
R. Kolevatov, S. Mironov, N. Sukhov +1
We study a "classical" bouncing scenario in beyond Horndeski theory. We give an example of spatially flat bouncing solution that is non-singular and stable throughout the whole evo…
Cosmological bounces and Lorentzian wormholes in Galileon theories with an extra scalar field
R. Kolevatov, S. Mironov
We study whether it is possible to design a "classical" spatially flat bouncing cosmology or a static, spherically symmetric asymptotically flat Lorentzian wormhole in cubic Galile…
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…
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…
Linearized Lorentz-Violating Gravity and Discriminant Locus in the Moduli Space of Mass Terms
Andrei Mironov, Sergey Mironov, Alexei Morozov +1
We analyze the pattern of normal modes in linearized Lorentz-violating massive gravity over the 5-dimensional moduli space of mass terms. Ghost-free theories arise at bifurcation p…