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Axion contribution to the mass-radius relation of neutron stars

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arxiv 2506.16932 v2 pith:AIJNBN57 submitted 2025-06-20 hep-ph

Axion contribution to the mass-radius relation of neutron stars

classification hep-ph
keywords neutronaxionsstaraxioncontributiondensitieseffectiveinteraction
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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An effective Lagrangian for the interaction between a pseudo-scalar (axion-like) field and massive fermions is considered. At high density and non-zero temperature axions can be produced through bremsstrahlung. If the axion-neutron interaction is greater than a certain value we can have a mean free path smaller than the size of a neutron star. The influence of such trapped axions on the mass-radius function of the neutron star is investigated by solving numerically the Tolman-Oppenheimer-Volkoff equations. We show that causality limits the applicability of the trapping regime. We find specific ranges of central densities and temperatures of a neutron star for which axions give a conspicuous contribution to the neutron-star mass. For other densities and temperatures axions do not have a significant effect on the structure of a neutron star. Since we use an effective approach our results can be easily applied to specific axion models.

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Cited by 1 Pith paper

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    hep-ph 2025-12 unverdicted novelty 7.0

    Extends thermal field theory to fermions with angular momentum and shows neutrino production in rotating neutron stars grows indefinitely with angular velocity near the inverse system size.