33 citations · 105 across the 6 of their papers we have counts for
7 papers
Universality classes of sharp gravitational production of light particles
Kanta Ito, Yusuke Mikura, Shuichiro Yokoyama
We establish a classification of the gravitational production of light particles across sharp transitions connecting different asymptotic forms of the scale factor. A family of smo…
Towards a classification of UV completable Higgs inflation in metric-affine gravity
Yusuke Mikura, Yuichiro Tada
Towards a classification of UV completable Higgs inflation in the framework of parity-even metric-affine gravity, we investigate the particle spectrum of a deformed theory in the l…
Gravitational waves from graviton Bremsstrahlung with kination phase
Ryoto Inui, Yusuke Mikura, Shuichiro Yokoyama
Gravitational waves (GWs) from gravitational three-body decay (graviton Bremsstrahlung process) can leave an indelible signal at ultrahigh frequencies. We focus on a scenario where…
Hybrid metric-Palatini Higgs inflation
Minxi He, Yusuke Mikura, Yuichiro Tada
We propose an extension of the Higgs inflation to the hybrid metric-Palatini gravity, where we introduce non-minimal couplings between Higgs and both the metric-type and the Palati…
On UV-completion of Palatini-Higgs inflation
Yusuke Mikura, Yuichiro Tada
We investigate the UV-completion of the Higgs inflation in the metric and the Palatini formalisms. It is known that the cutoff scales for the perturbative unitarity of these inflat…
Minimal -inflation in light of the conformal metric-affine geometry
Yusuke Mikura, Yuichiro Tada, Shuichiro Yokoyama
We motivate a minimal realization of slow-roll -inflation by incorporating the local conformal symmetry and the broken global symmetry in the metric-affine ge…
Conformal inflation in the metric-affine geometry
Yusuke Mikura, Yuichiro Tada, Shuichiro Yokoyama
Systematic understanding for classes of inflationary models is investigated from the viewpoint of the local conformal symmetry and the slightly broken global symmetry in the framew…