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SUMMARY:When stars dim into axions: A time-domain window on new physics
DTSTART;VALUE=DATE-TIME:20260811T060000Z
DTEND;VALUE=DATE-TIME:20260811T062500Z
DTSTAMP;VALUE=DATE-TIME:20260824T154647Z
UID:indico-contribution-2710@indico.itp.ac.cn
DESCRIPTION:Speakers: Hong-Yi Zhang (Tsung-Dao Lee Institute\, Shanghai Ji
 ao Tong University)\nMagnetic white dwarfs may reveal axions through a sim
 ple astrophysical scenario: photons leaving the stellar surface can conver
 t into axions while traversing the star's intense magnetic field. As the s
 tar rotates\, the changing magnetic geometry can imprint a periodic\, ener
 gy-dependent modulation on the observed light. Precision photometry can th
 erefore turn rotating magnetic stars into laboratories for fundamental phy
 sics.\n\nUsing the magnetic white dwarfs PG 1015+014 and RE J0317-853 as c
 ase studies\, we show how this scenario can be tested with TESS light curv
 es and achieve competitive sensitivity to sub-µeV axions. Intrinsic stell
 ar variability can mimic parts of the signal\, making a realistic understa
 nding of the stellar light curves essential. More broadly\, observations o
 f multiple magnetic white dwarfs could identify axion-induced modulation t
 hrough its correlations with magnetic-field geometry\, wavelength\, and ro
 tation phase\, opening a new time-domain window on weakly coupled particle
 s.\n\nhttps://indico.itp.ac.cn/event/416/contributions/2710/
LOCATION:Conference Center (2F) Back Area
URL:https://indico.itp.ac.cn/event/416/contributions/2710/
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