Zobrazeno 1 - 10
of 60
pro vyhledávání: '"Nakatsuka, Hiromasa"'
Autor:
Nakatsuka, Hiromasa, Morisaki, Soichiro, Fujita, Tomohiro, Kume, Jun'ya, Michimura, Yuta, Nagano, Koji, Obata, Ippei
Ultralight bosonic particles are fascinating candidates of dark matter (DM). It behaves as classical waves in our Galaxy due to its large number density. There have been various methods proposed to search for the wave-like DM, such as methods utilizi
Externí odkaz:
http://arxiv.org/abs/2205.02960
A pseudoscalar "axionlike" field, $\phi$, may explain the $3\sigma$ hint of cosmic birefringence observed in the $EB$ power spectrum of the cosmic microwave background (CMB) polarization data. Is $\phi$ dark energy or dark matter? A tomographic appro
Externí odkaz:
http://arxiv.org/abs/2203.08560
Publikováno v:
JCAP 09 (2022) 017
Antisymmetric tensor field (two-form field) is a ubiquitous component in string theory and generally couples to the scalar sector through its kinetic term. In this paper, we propose a cosmological scenario that the particle production of two-form fie
Externí odkaz:
http://arxiv.org/abs/2202.02401
Ultra-light axion-like particle (ULAP) with mass $m \sim 10^{-22} ~\mathrm{eV}$ has recently been attracting attention as a possible solution to the small-scale crisis. ULAP forms quasi-stable objects called oscillons/I-balls, which can survive up to
Externí odkaz:
http://arxiv.org/abs/2112.10464
Autor:
Michimura, Yuta, Fujita, Tomohiro, Kume, Jun'ya, Morisaki, Soichiro, Nagano, Koji, Nakatsuka, Hiromasa, Nishizawa, Atsushi, Obata, Ippei
Among various dark matter candidates, bosonic ultralight fields with masses below 1~eV are well motivated. Recently, a number of novel approaches have been put forward to search for ultralight dark matter candidates using laser interferometers at var
Externí odkaz:
http://arxiv.org/abs/2111.00420
The cosmic microwave background (CMB) observation by the Planck satellite precisely determines primordial curvature fluctuations on larger scales than $\mathcal O(1)\,\mathrm{Mpc}$, while the small-scale curvature fluctuation is still less constraine
Externí odkaz:
http://arxiv.org/abs/2110.12620
In a class of (pseudoscalar) inflation, inflationary phase is followed by a kination phase, where the Universe is dominated by the kinetic energy of the inflaton that runs away in a vanishing scalar potential. In this class of postinflationary evolut
Externí odkaz:
http://arxiv.org/abs/2110.10822
Autor:
Oshima, Yuka, Fujimoto, Hiroki, Ando, Masaki, Fujita, Tomohiro, Kume, Jun'ya, Michimura, Yuta, Morisaki, Soichiro, Nagano, Koji, Nakatsuka, Hiromasa, Nishizawa, Atsushi, Obata, Ippei, Watanabe, Taihei
Dark matter Axion search with riNg Cavity Experiment (DANCE) was proposed to search for axion dark matter [Phys. Rev. Lett. 121, 161301 (2018)]. We aim to detect the rotation and oscillation of optical linear polarization caused by axion-photon coupl
Externí odkaz:
http://arxiv.org/abs/2110.10607
Axion-like particles (ALPs) are pseudoscalar bosons predicted by string theory. The ALPs have a shallower potential than a quadratic one, which induces the instability and can form the solitonic object called oscillon/I-ball. Although the lifetime of
Externí odkaz:
http://arxiv.org/abs/2110.05790
Publikováno v:
Phys. Rev. D 105, 103519 (2022)
We study SU($N$) gauge fields that couple to the inflaton through the Chern-Simons term. We provide a general procedure to construct homogeneous, isotropic, and attractor solutions of the gauge fields during inflation. The gauge fields develop variou
Externí odkaz:
http://arxiv.org/abs/2110.03228