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4 papers · 2 filters
Redshift space distortions in the presence of non-minimally coupled dark matter
Fabio Chibana, Rampei Kimura, Masahide Yamaguchi +2
In this paper, we fully investigate cosmological scenarios in which dark matter is non-minimally coupled to an extra scalar degree of freedom. The interaction is realized by means…
CMB Constraints on the Stochastic Gravitational-Wave Background at Mpc scales
Toshiya Namikawa, Shohei Saga, Daisuke Yamauchi +1
We present robust constraints on the stochastic gravitational waves (GWs) at Mpc scales from the cosmic microwave background (CMB) data. CMB constraints on GWs are usually characte…
Constraining DHOST theories with linear growth of matter density fluctuations
Shin'ichi Hirano, Tsutomu Kobayashi, Daisuke Yamauchi +1
We investigate the potential of cosmological observations, such as galaxy surveys, for constraining degenerate higher-order scalar-tensor (DHOST) theories, focusing in particular o…
Large-scale inhomogeneity of dark energy produced in the ancestor vacuum
Yue Nan, Kazuhiro Yamamoto, Hajime Aoki +2
We investigate large-scale inhomogeneity of dark energy in the bubble nucleation scenario of the universe. In this scenario, the present universe was created by a bubble nucleation…