13 citations · 41 across the 9 of their papers we have counts for
9 papers
Caustic formation in DBI models: Wave propagation on planar domain walls
E. Babichev, B. Gafarov, S. Ramazanov +1
We investigate propagation of generic waves on thin planar domain walls effectively described by the scalar Dirac-Born-Infeld model (DBI). We pay a particular attention to the poss…
Ghost-free, gauge invariant SVT generalizations of Horndeski theory
S. Mironov, A. Shtennikova, M. Valencia-Villegas
We analyze the generalizations of Kaluza--Klein compactifications of 5D Horndeski theory. They are Scalar--Vector--Tensor (SVT) theories with higher derivatives in the action, but…
Luminal Scalar-Tensor theories for a not so dark Dark Energy
S. Mironov, A. Shtennikova, M. Valencia-Villegas
In general the speed of Gravitational Waves (GWs) in Scalar-Tensor modifications of Einstein's gravity is different from the speed of Light. Nevertheless, it has been measured that…
Higher derivative SVT theories from Kaluza-Klein reductions of Horndeski theory
S. Mironov, A. Shtennikova, M. Valencia-Villegas
It was recently pointed out that some precise Photon-Galileon couplings in four dimensions (4D) -- inspired by a higher dimensional reduction -- are enough to obtain a Horndeski th…
Healthy Horndeski cosmologies with torsion
S. Mironov, M. Valencia-Villegas
We show that the full Horndeski theory with both curvature and torsion can support nonsingular, stable and subluminal cosmological solutions at all times. Thus, with torsion, the u…
Reviving Horndeski after GW170817 by Kaluza-Klein compactifications
S. Mironov, A. Shtennikova, M. Valencia-Villegas
The application of Horndeski theory/ Galileons for late time cosmology is heavily constrained by the strict coincidence in the speed of propagation of gravitational and electromagn…
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…
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…
Ghost condensation and Ostrogradskian instability on low derivative backgrounds
Justo Lopez-Sarrion, Mauricio Valencia-Villegas
We show a new class of interaction terms with higher derivatives that can be added to every low derivative real scalar, such that the theory is degenerate, and the equation of moti…