16 citations · 52 across the 4 of their papers we have counts for
4 papers
Holographic non-Gaussianities in general single-field inflation
Hiroshi Isono, Toshifumi Noumi, Gary Shiu +2
We use holographic techniques to compute inflationary non-Gaussianities for general single-field inflation, including models with a non-trivial sound speed. In this holographic app…
Nonlocal N=1 Supersymmetry
Tetsuji Kimura, Anupam Mazumdar, Toshifumi Noumi +1
We construct supersymmetric nonlocal theories in four dimension. We discuss higher derivative extensions of chiral and vector superfields, and write down generic fo…
Dynamical breaking of shift-symmetry in supergravity-based inflation
Anupam Mazumdar, Toshifumi Noumi, Masahide Yamaguchi
Shift-symmetry is essential to protect the flatness of the potential, even beyond the super-Planckian vacuum expectation value (VEV) for an inflaton field. The breaking of the shif…
Non-Gaussianities of primordial perturbations and tensor sound speed
Toshifumi Noumi, Masahide Yamaguchi
We investigate the relation between the non-Gaussianities of the primordial perturbations and the sound speed of the tensor perturbations, that is, the propagation speed of the gra…