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Signatures of photon and axion-like particle mixing in the gamma-ray burst jet

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Signatures of photon and axion-like particle mixing in the gamma-ray burst jet

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dc.contributor.author Mena Requejo, Olga
dc.contributor.author Razzaque, Soebur
dc.contributor.author Villaescusa Navarro, Francisco Antonio
dc.date.accessioned 2014-09-11T08:00:25Z
dc.date.available 2014-09-11T08:00:25Z
dc.date.issued 2011
dc.identifier.citation Mena Requejo, Olga Razzaque, Soebur Villaescusa Navarro, F. 2011 Signatures of photon and axion-like particle mixing in the gamma-ray burst jet Journal Of Cosmology And Astroparticle Physics 02 2 030
dc.identifier.uri http://hdl.handle.net/10550/37721
dc.description.abstract Photons couple to Axion-Like Particles (ALPs) or more generally to any pseudo Nambu-Goldstone boson in the presence of an external electromagnetic field. Mixing between photons and ALPs in the strong magnetic field of a Gamma-Ray Burst (GRB) jet during the prompt emission phase can leave observable imprints on the gamma-ray polarization and spectrum. Mixing in the intergalactic medium is not expected to modify these signatures for ALP mass > 10(-14) eV and/or for < nG magnetic field. We show that the depletion of photons due to conversion to ALPs changes the linear degree of polarization from the values predicted by the synchrotron model of gamma ray emission. We also show that when the magnetic field orientation in the propagation region is perpendicular to the field orientation in the production region, the observed synchrotron spectrum becomes steeper than the theoretical prediction and as detected in a sizable fraction of GRB sample. Detection of the correlated polarization and spectral signatures from these steep-spectrum GRBs by gamma-ray polarimeters can be a very powerful probe to discover ALPs. Measurement of gamma-ray polarization from GRBs in general, with high statistics, can also be useful to search for ALPs.
dc.language.iso eng
dc.relation.ispartof Journal Of Cosmology And Astroparticle Physics, 2011, vol. 02, num. 2, p. 030
dc.subject Física
dc.title Signatures of photon and axion-like particle mixing in the gamma-ray burst jet
dc.type journal article es_ES
dc.date.updated 2014-09-11T08:00:25Z
dc.identifier.doi 10.1088/1475-7516/2011/02/030
dc.identifier.idgrec 097561
dc.rights.accessRights open access es_ES

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