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SUMMARY:Bias with a Timer: Axion Domain Wall Decay and Dark Matter
DTSTART;VALUE=DATE-TIME:20260811T072500Z
DTEND;VALUE=DATE-TIME:20260811T074500Z
DTSTAMP;VALUE=DATE-TIME:20260824T164743Z
UID:indico-contribution-2685@indico.itp.ac.cn
DESCRIPTION:Speakers: Sally Yuxuan Hao (TDLI\, SJTI)\nWe explore the inter
 play of the post-inflationary QCD axion and a light scalar field for the a
 xion domain wall decay and dark matter (DM). The scalar field possesses a 
 nonzero vacuum expectation value (VEV) during inflation\, so that its inte
 raction with the axion effectively serves as an explicit Peccei-Quinn (PQ)
  violating term. At a temperature below the PQ phase transition\, the effe
 ctive PQ violating interaction generates the axion potential which general
 ly contains multiple degenerate vacua leading to the formation of the axio
 n string-domain wall networks. The following QCD phase transition provides
  another contribution to the axion potential making domain walls decay bef
 ore they dominate the Universe. Later\, the scalar field starts to relax t
 o the minimum of its potential with a vanishing VEV\, turning off the effe
 ctive PQ violating interaction so that the axion potential is aligned with
  the QCD vacuum. We keep track of the evolution of the axion-scalar system
  and discuss the production of the axion DM through the domain wall decay 
 and the (trapped) misalignment. We find that the string-wall network in so
 me cases can decay due to its structural instability\, rather than the vol
 ume pressure\, and the correct axion DM abundance is realized with the dec
 ay constant larger than that of the conventional post-inflationary QCD axi
 on without fine tuning.\n\nhttps://indico.itp.ac.cn/event/416/contribution
 s/2685/
LOCATION:Conference Center (2F) Back Area
URL:https://indico.itp.ac.cn/event/416/contributions/2685/
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