Zobrazeno 1 - 10
of 787
pro vyhledávání: '"YAMADA, MASAKI"'
Publikováno v:
JCAP 10 (2024) 080
We quantitatively analyze a basic question: what is the stationary solution of the background plasma temperature profile around a black hole (BH)? One may naively expect that the temperature profile continuously decreases from the Hawking temperature
Externí odkaz:
http://arxiv.org/abs/2407.15926
We present a conceptually simple model to generate asymmetries that are not directly related to baryon nor lepton charges. The model employs a three-Higgs doublet framework, wherein the other two Higgs fields are significantly heavier than the Standa
Externí odkaz:
http://arxiv.org/abs/2405.14332
Autor:
Tada, Yuichiro, Yamada, Masaki
We revisit the hybrid inflation model within the framework of the Grand Unified Theory (GUT), focusing on cases where the waterfall phase transition extends over several e-foldings to dilute monopoles. Considering the stochastic effects of quantum fl
Externí odkaz:
http://arxiv.org/abs/2405.08859
Autor:
Mukaida, Kyohei, Yamada, Masaki
We investigate the thermalization of high-energy particles injected from the perturbative decay of inflaton during the pre-thermal phase of reheating in detail. In general, thermalization takes a relatively long time in a low-temperature plasma; ther
Externí odkaz:
http://arxiv.org/abs/2402.14054
Autor:
Co, Raymond T., Yamada, Masaki
Axion rotations can simultaneously explain the dark matter abundance and the baryon asymmetry of the Universe by kinetic misalignment and axiogenesis. We consider a scenario in which the Peccei-Quinn symmetry breaking field is as large as the Planck
Externí odkaz:
http://arxiv.org/abs/2312.17730
Publikováno v:
Phys.Lett.B 849 (2024) 138465
We discuss the unique phenomenology of first-order phase transitions catalyzed by primordial black holes (BHs). If the number of BHs within one Hubble volume is smaller than unity at the time of bubble nucleation, each bubble catalyzed around them ca
Externí odkaz:
http://arxiv.org/abs/2310.06901
In the presence of an anomalous CP phase in a U(1) gauge theory, a monopole becomes a dyon via the Witten effect. When the anomalous CP phase is promoted to a dynamical field, the axion, the electric charge of the dyon changes according to the cohere
Externí odkaz:
http://arxiv.org/abs/2309.16570
Publikováno v:
Phys.Lett.B 849 (2024) 138447
We explore a dynamical mechanism to realize the emergence of a global $U(1)_{\rm PQ}$ symmetry and its spontaneous breaking at an intermediate scale for an axion solution to the strong CP problem. Such a dynamics is provided by a new supersymmetric Q
Externí odkaz:
http://arxiv.org/abs/2309.06964
Autor:
Yamada, Masaki, Yonekura, Kazuya
We point out that SO($2N$) pure Yang-Mills theory provides a candidate for dark matter (DM) without the explicit need to impose any additional symmetry. The DM candidate is a particular type of glueball, which we refer to as a baryonic glueball, that
Externí odkaz:
http://arxiv.org/abs/2307.06586
We show that the baryon asymmetry of the Universe cannot be explained by a large initial value before inflation because it inevitably predicts correlated baryon isocurvature perturbations that are already excluded by cosmic microwave background obser
Externí odkaz:
http://arxiv.org/abs/2307.03049