235 citations · 2.2k across the 57 of their papers we have counts for
4 papers · 1 filter
Scalar field couplings to quadratic curvature and decay into gravitons
Yohei Ema, Kyohei Mukaida, Kazunori Nakayama
Any field, even if it lives in a completely hidden sector, interacts with the visible sector at least via the gravitational interaction. In this paper, we show that a scalar field…
Improved indirect limits on muon EDM
Yohei Ema, Ting Gao, Maxim Pospelov
Given current discrepancy in muon and future dedicated efforts to measure muon electric dipole moment (EDM) , we assess the indirect constraints imposed on by the…
Preheating from target space curvature and unitarity violation: Analysis in field space
Yohei Ema, Ryusuke Jinno, Kazunori Nakayama +1
We study particle production and unitarity violation caused by a curved target space right after inflation. We use the inflaton field value instead of cosmic time as the time varia…
Axion assisted Schwinger effect
Valerie Domcke, Yohei Ema, Kyohei Mukaida
We point out an enhancement of the pair production rate of charged fermions in a strong electric field in the presence of time dependent classical axion-like background field, whic…