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SUMMARY:Floquet and Sideband Dynamics of Photon–Axion Mixing in Coherent
  Axion Backgrounds
DTSTART;VALUE=DATE-TIME:20260810T071500Z
DTEND;VALUE=DATE-TIME:20260810T074000Z
DTSTAMP;VALUE=DATE-TIME:20260824T185750Z
UID:indico-contribution-2677@indico.itp.ac.cn
DESCRIPTION:Speakers: Runmin Yao (HIAS\, UCAS)\nCoherent axion dark matter
  provides a periodically time-dependent background for electromagnetic pro
 pagation. In the presence of an external magnetic field\, the oscillating 
 axion field acts as a temporal pump and can drive photon–axion conversio
 n beyond the conventional static or adiabatic level-crossing picture. A un
 ified Floquet and sideband description of this dynamics will be presented.
 \n\nResonant photon–axion mixing can occur when the mismatch between pho
 ton and axion dispersion relations is compensated by integer harmonics of 
 the axion oscillation frequency. This driven resonance enables efficient c
 onversion away from the usual level-crossing regime and is missed after ti
 me averaging. It constitutes a unitary mode-conversion process\, distinct 
 from axion decay or parametric particle production\, and can lead to chara
 cteristic polarization signatures relevant for astrophysical observations.
 \n\nA Floquet–Bloch sideband formulation of axion electrodynamics will b
 e discussed. The periodic axion background generates a ladder of photon an
 d axion sidebands. Near folded degeneracies\, the system reduces to univer
 sal two-mode crossings whose stability is determined by the symplectic\, o
 r Krein\, signatures of the colliding modes. This framework unifies stable
  avoided crossings\, parametric instabilities\, forward conversion\, stop 
 bands\, and distributed reflection within a single language.\n\nTogether\,
  these results clarify how coherent axion backgrounds modify wave propagat
 ion and provide new theoretical tools for identifying observable signature
 s of axion dark matter.\n\nhttps://indico.itp.ac.cn/event/416/contribution
 s/2677/
LOCATION:Conference Center (2F) Front Area
URL:https://indico.itp.ac.cn/event/416/contributions/2677/
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