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SUMMARY:Transient Bias for CP Domain Wall Decay and Dark Matter
DTSTART;VALUE=DATE-TIME:20260811T070500Z
DTEND;VALUE=DATE-TIME:20260811T072500Z
DTSTAMP;VALUE=DATE-TIME:20260824T185800Z
UID:indico-contribution-2665@indico.itp.ac.cn
DESCRIPTION:Speakers: Fangchao Liu (TDLI\, SJTU)\nSpontaneous CP violation
  (SCPV) provides an attractive solution to the strong CP problem. However\
 , SCPV after inflation suffers from the formation of CP domain walls\, req
 uiring the maximal temperature of the Universe to lie below the CP-breakin
 g scale. In the present work\, we then propose a dynamical mechanism that 
 removes this cosmological constraint without introducing permanent explici
 t CPV. We consider a new scalar field that acquires a large field value wi
 th a nontrivial phase in the early Universe and induces a transient bias a
 mong degenerate CP vacua through a higher-dimensional interaction with a C
 P-breaking scalar field. This bias triggers the decay of CP domain walls a
 fter they form. As the new scalar field evolves toward the origin\, the bi
 as disappears\, leaving the low-energy CP structure intact. We derive the 
 conditions for successful domain wall decay and identify the viable parame
 ter space. Furthermore\, we point out that the coherent oscillation of the
  new scalar field naturally survives as dark matter\, linking the resoluti
 on of the CP domain wall problem to the origin of dark matter.\n\nhttps://
 indico.itp.ac.cn/event/416/contributions/2665/
LOCATION:Conference Center (2F) Back Area
URL:https://indico.itp.ac.cn/event/416/contributions/2665/
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