54 citations · 159 across the 5 of their papers we have counts for
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gr-qc2018★ 17 cited
Self-anisotropizing inflationary universe in Horndeski theory and beyond
Hiroaki W. H. Tahara, Sakine Nishi, Tsutomu Kobayashi +1
As opposed to Wald's cosmic no-hair theorem in general relativity, it is shown that the Horndeski theory (and its generalization) admits anisotropic inflationary attractors if the…
gr-qc2017★ 54 cited
Healthy imperfect dark matter from effective theory of mimetic cosmological perturbations
Shin'ichi Hirano, Sakine Nishi, Tsutomu Kobayashi
We study the stability of a recently proposed model of scalar-field matter called mimetic dark matter or imperfect dark matter. It has been known that mimetic matter with higher de…