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5 papers · 2 filters
Effects of Cosmic Strings on Free Streaming
Tomo Takahashi, Masahide Yamaguchi
We study the effect of free streaming in a universe with cosmic strings with time-varying tension as well as with constant tension. Although current cosmological observations sugge…
Constraining SuperWIMPy and Warm Subhalos with Future Submillilensing
Junji Hisano, Kaiki Taro Inoue, Tomo Takahashi
We propose to observe QSO-galaxy strong lens systems to give a new constraint on the damping scale of the initial fluctuations. We find that the future observation of submilliarc s…
Implications of cosmic strings with time-varying tension on CMB and large scale structure
Kazuhide Ichikawa, Tomo Takahashi, Masahide Yamaguchi
We investigate cosmological evolution and implications of cosmic strings with time-dependent tension. We derive basic equations of time development of the correlation length and th…
Meson loop effect on high density chiral phase transition
Tomohiko Sakaguchi, Kouji Kashiwa, Masayuki Matsuzaki +2
We test the stability of the mean-field solution in the Nambu--Jona-Lasinio model. For stable solutions with respect to both the σand πdirections, we investigate effects of the mes…
New Critical Point Induced by the Axial Anomaly in Dense QCD
Tetsuo Hatsuda, Motoi Tachibana, Naoki Yamamoto +1
We study the interplay between chiral and diquark condensates within the framework of the Ginzburg-Landau free energy, and classify possible phase structures of two and three-flavo…