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Baryon isocurvature constraints on the primordial hypermagnetic fields
Kohei Kamada, Fumio Uchida, Jun'ichi Yokoyama
It has been pointed out that hypermagnetic helicity decay at the electroweak symmetry breaking may have produced the observed baryon asymmetry of the Universe through the chiral an…
Method for environmental noise estimation via injection tests for ground-based gravitational wave detectors
T. Washimi, T. Yokozawa, T. Tanaka +3
Environmental noise is one of the critical issues for the observation of gravitational waves, but is difficult to predict in advance. Therefore, to evaluate the adverse impact of e…
Overview of KAGRA : KAGRA science
KAGRA Collaboration, T. Akutsu, M. Ando +240
KAGRA is a newly build gravitational-wave observatory, a laser interferometer with 3 km arm length, located in Kamioka, Gifu, Japan. In this paper in the series of KAGRA-featured a…
Occurrence of Tachyonic Preheating in the Mixed Higgs- Model
Minxi He, Ryusuke Jinno, Kohei Kamada +2
It has recently been suggested that at the post-inflationary stage of the mixed Higgs- model of inflation efficient particle production can arise from the tachyonic instabilit…
On catalyzed vacuum decay around a radiating black hole and the crisis of the electroweak vacuum
Takumi Hayashi, Kohei Kamada, Naritaka Oshita +1
False vacuum decay is a key feature in quantum field theories and exhibits a distinct signature in the early Universe cosmology. It has recently been suggested that the false vacuu…
Particle production induced by vacuum decay in real time dynamics
Soichiro Hashiba, Yusuke Yamada, Jun'ichi Yokoyama
We discuss particle production associated with vacuum decay, which changes the mass of a scalar field coupled to a background field which induces the decay. By utilizing the Stokes…