181 citations · 846 across the 29 of their papers we have counts for
9 papers · 1 filter
Vainshtein Mechanism in Generalised Massive Gravity
A. Emir Gumrukcuoglu, Rampei Kimura, Michael Kenna-Allison +1
We present a non-linear analysis of perturbations around cosmological solutions in Generalised Massive gravity. This Lorentz invariant theory is an extension of de Rham, Gabadadze,…
On Lorentz-invariant bi-spin-2 theories
Rampei Kimura, Atsushi Naruko, Daisuke Yamauchi
We investigate a Lorentz invariant action which is quadratic in two rank-2 symmetric tensor fields in Minkowski spacetime. We apply a scalar-vector-tensor decomposition to two tens…
On Lorentz-invariant spin-2 theories
Atsushi Naruko, Rampei Kimura, Daisuke Yamauchi
We construct Lorentz-invariant massless/massive spin-2 theories in flat spacetime. Starting from the most generic action of a rank-2 symmetric tensor field whose Lagrangian contain…
Ghost-free scalar-fermion interactions
Rampei Kimura, Yuki Sakakihara, Masahide Yamaguchi
We discuss a covariant extension of interactions between scalar fields and fermions in a flat space-time. We show, in a covariant theory, how to evade fermionic ghosts appearing be…
Ghost free boson-fermion co-existence system
Rampei Kimura, Yuki Sakakihara, Masahide Yamaguchi
We study co-existence system of both bosonic and fermionic degrees of freedom. For such system with up to first derivatives in Lagrangian, we find Ostrogradsky-type ghost-free cond…
The fate of non-diagonalizable interactions in quasidilaton theory
Rampei Kimura
It has been shown that the spherically symmetric solutions in a subclass of quasidilaton theory are stable against all degrees of freedom and does not even exhibit superluminal pro…