117 citations · 1k across the 40 of their papers we have counts for
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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…
The effects of anisotropy and non-adiabaticity on the evolution of comoving curvature perturbation
Atsushi Naruko, Antonio Enea Romano, Misao Sasaki +1
We derive the equation for the evolution of the curvature perturbation on the comoving time slice, , in the presence of anisotropic and non-adiabatic terms in the en…
Stable cosmological solutions in degenerate theory of gravity
Ryotaro Kase, Rampei Kimura, Atsushi Naruko +1
We study cosmological applications of extended vector-tensor theories, whose Lagrangians contain up to two derivatives with respect to metric and vector field. We derive background…