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작성자 CQUeST 날짜 2020-12-14
제목 [Seminar] December 18 (Fri.) 4:30 p.m. Hiromasa Nakatsuka
Seminar
DATE & TIME   December 18 (Friday), 4:30 p.m.
PLACE   Online
  Link: https://zoom.us/j/93219673304?pwd=QmxTek14TVFBeHlSb0kvV0lpUFBEdz09
SPEAKER   Hiromasa Nakatsuka
HOST   Eoin O Colgain
INSTITUTE   Tokyo University
TITLE  Isotropic cosmic birefringence and its implications for axion-like particles including dark energy
ABSTRACT

  Recent analysis of CMB polarization data from Planck satellite suggests a hint of a new signal, isotropic cosmic birefringence, which is found through a parity-violating correlation between the E- and B-mode polarization. We investigate the possibility that axion-like particles (ALPs) account for the isotropic birefringence via the party-violating Chern-Simons coupling to photons. Especially when the ALP is responsible for dark energy, it is possible to probe the tiny deviation of the dark energy equation of state from −1 through the cosmic birefringence. We also explore ALPs working as early dark energy, which alleviates the Hubble tension problem.


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