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SUMMARY:Tomography of cosmic birefringence induced by 3-form dark energy
DTSTART;VALUE=DATE-TIME:20261107T063000Z
DTEND;VALUE=DATE-TIME:20261107T070000Z
DTSTAMP;VALUE=DATE-TIME:20261023T141242Z
UID:indico-contribution-2986@indico.itp.ac.cn
DESCRIPTION:Speakers: Kohei Kamada (HIAS-UCAS)\n3-form dark energy shows a
  similar behavior to but distinguishable one from that of a scalar field i
 n an expanding universe\, and its tensorial structure allows for unique co
 uplings that cannot be experienced by canonical scalars.\nWe here explore 
 the possibility that 3-form dark energy can explain the cosmic birefringen
 ce angle β~0.3°\, as suggested by observations of the CMB polarization.\
 nWe consider two EFT-inspired couplings between the 3-form and the photon\
 , finding a dimension-4 operator is a candidate explanation\, moreover pre
 dicting a photon mass around the Hubble scale.\nThe profiles for β(z) fro
 m the model can mimic those from ALP dark energy or ALP dark matter\, or b
 e distinguishable\, depending on the field configuration in the early univ
 erse\, which may be tested by precise measurements of CMB polarization or 
 radio galaxies.\n\nhttps://indico.itp.ac.cn/event/417/contributions/2986/
LOCATION:
URL:https://indico.itp.ac.cn/event/417/contributions/2986/
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