179 citations · 1.8k across the 51 of their papers we have counts for
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SUSY contributions to CP violations in and transitions facing on new data
Yusuke Shimizu, Morimitsu Tanimoto, Kei Yamamoto
We study the contribution of the gluino-squark mediated flavor changing process for the CP violation in and transitions facing on recent experimental data. The ma…
Primordial bispectrum from inflation with background gauge fields
Hiroyuki Funakoshi, Kei Yamamoto
We study the primordial bispectrum of curvature perturbation in the uniform- density slicing generated by the interaction between the inflaton and isotropic background gauge fields…
Killing-Yano symmetry of Kaluza-Klein black holes in five dimensions
Tsuyoshi Houri, Kei Yamamoto
Using a generalised Killing-Yano equation in the presence of torsion, spacetime metrics admitting a rank-2 generalised Killing-Yano tensor are investigated in five dimensions under…
Do intergalactic magnetic fields imply an open universe?
J. D. Barrow, C. G. Tsagas, K. Yamamoto
The detection of magnetic fields at high redshifts, and in empty intergalactic space, support the idea that cosmic magnetism has a primordial origin. Assuming that Maxwellian elect…
Cosmologies in Horndeski's second-order vector-tensor theory
John D. Barrow, Mikjel Thorsrud, Kei Yamamoto
Horndeski derived a most general vector-tensor theory in which the vector field respects the gauge symmetry and the resulting dynamical equations are of second order. The action co…
Inflationary Dynamics with a Non-Abelian Gauge Field
Kei-ichi Maeda, Kei Yamamoto
We study the dynamics of the universe with a scalar field and an SU(2) non-Abelian Gauge (Yang-Mills) field. The scalar field has an exponential potential and the Yang-Mills field…
Direct CP violation of and CP asymmetries of non-leptonic B decays in squark flavor mixing
Yusuke Shimizu, Morimitsu Tanimoto, Kei Yamamoto
We study the contribution of the squark flavor mixing from the component of the squark mass matrices to the direct CP violation of the decay and the CP-violating…
Origin of cosmic magnetic fields: Superadiabatically amplified modes in open Friedmann universes
J. D. Barrow, C. G. Tsagas, K. Yamamoto
Cosmological magnetic fields in open Friedmann universes can experience superadiabatic amplification within the realm of conventional electromagnetism. This is possible mathematica…
Squark flavor mixing and CP asymmetry of neutral mesons at LHCb
Atsushi Hayakawa, Yusuke Shimizu, Morimitsu Tanimoto +1
The CP violation of the neutral meson is the important phenomenon to search for the new physics. The like-sign dimuon charge asymmetry observed by the D Collaboration indica…
Primordial Fluctuations from Inflation with a Triad of Background Gauge Fields
Kei Yamamoto
We study the linear perturbation of the recently proposed model of inflation where a uniform gauge-kinetic coupling of the inflaton to multiple vector fields breaks the cosmic no-h…
Inflation with Multi-Vector-Hair: The Fate of Anisotropy
Kei Yamamoto, Masa-aki Watanabe, Jiro Soda
We study inflation with multiple vector fields. In the presence of non-trivial couplings between the inflaton and the vector fields, it turns out that no-hair conjecture does not h…