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Cool WISPs for stellar cooling excesses

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arxiv 1512.08108 v2 pith:XHINCW54 submitted 2015-12-26 astro-ph.HE astro-ph.SRhep-ph

Cool WISPs for stellar cooling excesses

Maurizio Giannotti , Igor Irastorza , Javier Redondo , Andreas Ringwald This is my paper
classification astro-ph.HE astro-ph.SRhep-ph
keywords coolingparticlesaccessiblealpsenergyexcessesmasslessmechanism
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Several stellar systems (white dwarfs, red giants, horizontal branch stars and possibly the neutron star in the supernova remnant Cassiopeia A) show a mild preference for a non-standard cooling mechanism when compared with theoretical models. This exotic cooling could be provided by Weakly Interacting Slim Particles (WISPs), produced in the hot cores and abandoning the star unimpeded, contributing directly to the energy loss. Taken individually, these excesses do not show a strong statistical weight. However, if one mechanism could consistently explain several of them, the hint could be significant. We analyze the hints in terms of neutrino anomalous magnetic moments, minicharged particles, hidden photons and axion-like particles (ALPs). Among them, the ALP or a massless HP represent the best solution. Interestingly, the hinted ALP parameter space is accessible to the next generation proposed ALP searches, such as ALPS II and IAXO and the massless HP requires a multi TeV energy scale of new physics that might be accessible at the LHC.

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