Axion mass limits may be improved by pulsar x-ray measurements

Details Axion mass limits may be improved by pulsar x-ray measurements Axion mass limits may be improved by pulsar x-ray measurements

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phrvd..34..843m&link_type=abstract

Physical Review D (Particles and Fields), Volume 34, Issue 3, 1 August 1986, pp.843-848

Other

18

Elementary Particle Processes, Radiation Mechanisms, Polarization, Neutron Stars

Scientific paper

Axions thermally emitted by a neutron star would be converted into x rays in the strong magnetic field surrounding the star. The present observational limit of pulsed x rays from the Vela pulsar (PSR 0833-45) is not small enough to bound the axion mass. An increase in x-ray sensitivity by a factor of 104 would constrain the axion mass Ma<3×10-3 eV if the core is nonsuperfluid and at temperature Tc~2×108 K. This would improve the limits Ma<~4×10-2 eV from neutron-star cooling and Ma<1×10-2 eV from red-giant evolution. If the core is superfluid throughout, a factor of 105 in sensitivity would be needed. A search for modulated hard x rays from PSR 1509-58 or other young pulsars is suggested. A limit on pulsed hard x rays <5×10-7 photons/cm2 sec from a very young hot (Tc~7×108 K) pulsar within the Galaxy could set a firm bound on the axion mass, since neutron superfluidity is not expected above this temperature.

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