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Inflation in a viscous fluid model
Kazuharu Bamba, Sergei D. Odintsov
We explore a fluid description of the inflationary universe. In particular, we investigate a fluid model in which the equation of state (EoS) for a fluid includes bulk viscosity. W…
Large-scale magnetic fields, non-Gaussianity, and gravitational waves from inflation
Kazuharu Bamba
We explore the generation of large-scale magnetic fields in the so-called moduli inflation. The hypercharge electromagnetic fields couple to not only a scalar field but also a pseu…
Construction of energy-momentum tensor of gravitation
Kazuharu Bamba, Katsutaro Shimizu
We construct the gravitational energy-momentum tensor in general relativity through the Noether theorem. In particular, we explicitly demonstrate that the constructed quantity can…
Cosmological Issues in Gravity Theory
Kazuharu Bamba
We review recent developments on cosmology in extended teleparallel gravity, called " gravity" with the torsion scalar in teleparallelism. We explore various cosmological…
Inflation in a conformally-invariant two-scalar-field theory with an extra term
Kazuharu Bamba, Sergei D. Odintsov, Petr V. Tretyakov
We explore inflationary cosmology in a theory where there are two scalar fields which non-minimally couple to the Ricci scalar and an additional term, which breaks the confor…
Inflationary cosmology in modified gravity theories
Kazuharu Bamba, Sergei D. Odintsov
We review inflationary cosmology in modified gravity such as gravity with its extensions in order to generalize the Starobinsky inflation model. In particular, we explore inf…