57 citations · 332 across the 19 of their papers we have counts for
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hep-th2010★ 44 cited
Non-linear sigma model in de Sitter space
Hiroyuki Kitamoto, Yoshihisa Kitazawa
We investigate infra-red dynamics of the non-linear sigma model in de Sitter space. In the presence of minimally coupled massless scalar fields, the de Sitter symmetry is dynamical…
hep-th2010★ 22 cited
Boltzmann equation in de Sitter space
Hiroyuki Kitamoto, Yoshihisa Kitazawa
In a time dependent background like de Sitter space, Feynman-Dyson perturbation theory breaks down due to infra-red divergences. We investigate an interacting scalar field theory i…