98 citations · 272 across the 6 of their papers we have counts for
6 papers
Direct/indirect detection signatures of nonthermally produced dark matter
Minoru Nagai, Kazunori Nakayama
We study direct and indirect detection possibilities of neutralino dark matter produced non-thermally by e.g. the decay of long-lived particles, as is easily implemented in the cas…
Space laser interferometers can determine the thermal history of the early Universe
Kazunori Nakayama, Shun Saito, Yudai Suwa +1
It is shown that space-based gravitational wave detectors such as DECIGO and/or Big Bang Observer (BBO) will provide us with invaluable information on the cosmic thermal history af…
Solving Cosmological Problems of Supersymmetric Axion Models in an Inflationary Universe
Masahiro Kawasaki, Kazunori Nakayama
We revisit inflationary cosmology of axion models in the light of recent developments on the inflaton decay in supergravity. We find that all the cosmological difficulties, includi…
Cosmological implications of supersymmetric axion models
Masahiro Kawasaki, Kazunori Nakayama, Masato Senami
We derive general constraints on supersymmetric extension of axion models, in particular paying careful attention to the cosmological effects of saxion. It is found that for every…
Nonthermal dark matter in mirage mediation
Minoru Nagai, Kazunori Nakayama
In mirage-mediation models there exists a modulus field whose mass is O(1000) TeV and its late-decay may significantly change the standard thermal relic scenario of the dark matter…
Baryon Asymmetry in a Heavy Moduli Scenario
Masahiro Kawasaki, Kazunori Nakayama
In some models of supersymmetry breaking, modulus fields are heavy enough to decay before BBN. But the large entropy produced via moduli decay significantly dilutes the preexisting…