104 citations · 479 across the 23 of their papers we have counts for
23 papers
Fine tunings for inflation with simple potentials
K. -I. Izawa
We continue to investigate possible parameter choices for primordial inflation with simple potentials such as power-law and two-term potentials. We examine the amount of parameter…
Nonlinearly Realized Extended Supergravity
K. -I. Izawa, Y. Nakai, Ryo Takahashi
We provide nonlinear realization of supergravity with an arbitrary number of supersymmetries by means of coset construction. The number of gravitino degrees of freedom counts the n…
A Note on Quasi-Riemannian Gravity with Higher Derivatives
K. -I. Izawa
Quasi-Riemannian theories of gravity have smaller gauge groups acting on the tangent spacetime than the full Lorentz group. Among others, the spatial rotation group can be gauged t…
Supersymmetric Inflation of Dynamical Origin
K. Hamaguchi, K. -I. Izawa, H. Nakajima
Dynamical models of inflation are given with composite inflatons by means of massive supersymmetric gauge theory. Nearly flat directions and stable massive ones in the potential ar…
Supersymmetric Tuned Inflation
K. -I. Izawa, Y. Shinbara
We address an issue what kind of tuning realizes a flat potential for inflaton in supergravity. We restrict ourselves to the case that inflationary dynamics is not affected by sepa…
Marginally Eternal Inflation
K. -I. Izawa
We examine the amount of parameter tuning to make slow-roll inflation marginally eternal by considering an R-invariant chaotic inflation as an example of one-parameter tuning in su…