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SUMMARY:Constraining axion couplings with the Hulse-Taylor binary system
DTSTART;VALUE=DATE-TIME:20260811T064500Z
DTEND;VALUE=DATE-TIME:20260811T070500Z
DTSTAMP;VALUE=DATE-TIME:20260824T174810Z
UID:indico-contribution-2671@indico.itp.ac.cn
DESCRIPTION:Speakers: Ziwen Yin (Tsung-Dao Lee Institute & SJTU)\nThe orbi
 tal evolution of the Hulse-Taylor binary neutron star system is described 
 with high precision by General Relativity\, in which gravity is the only l
 ong-range force and gravitational waves provide the dominant energy-loss c
 hannel. We use this precision test of relativistic binary dynamics to deri
 ve new constraints on axion couplings to stable neutron-star constituents:
  neutrons\, electrons\, and muons. In the presence of exotic long-range fo
 rces and additional radiation channels\, the measured orbital decay constr
 ains the strength of quadratic axion-fermion interactions.\n Axions enjoy 
 a perturbative shift symmetry that is broken by non-perturbative effects r
 esponsible for the axion mass. Such shift symmetry breaking can induce qua
 dratic couplings between axions and fermions. In an ambient axion dark-mat
 ter background\, these couplings mediate enhanced long-range\, spin-indepe
 ndent forces\, while also allowing binary systems to lose energy through d
 ipole and quadrupole emission of axion waves. For light QCD axions and for
  models in which non-perturbative effects correct lepton masses\, our boun
 ds can be recast as limits on the axion decay constant.\n\nhttps://indico.
 itp.ac.cn/event/416/contributions/2671/
LOCATION:Conference Center (2F) Back Area
URL:https://indico.itp.ac.cn/event/416/contributions/2671/
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