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Cosmological origin of anomalous radio background

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Cosmological origin of anomalous radio background

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dc.contributor.author Cline, James M.
dc.contributor.author Vincent, Aaron C.
dc.date.accessioned 2014-02-19T10:52:48Z
dc.date.available 2014-02-19T10:52:48Z
dc.date.issued 2013
dc.identifier.citation Cline, James M. Vincent, Aaron 2013 Cosmological origin of anomalous radio background Journal Of Cosmology And Astroparticle Physics
dc.identifier.uri http://hdl.handle.net/10550/33087
dc.description.abstract The ARCADE 2 collaboration has reported a significant excess in the isotropic radio background, whose homogeneity cannot be reconciled with clustered sources. This suggests a cosmological origin prior to structure formation. We investigate several potential mechanisms and show that injection of relativistic electrons through late decays of a metastable particle can give rise to the observed excess radio spectrum through synchrotron emission. However, constraints from the cosmic microwave background (CMB) anisotropy, on injection of charged particles and on the primordial magnetic field, present a challenge. The simplest scenario is with a gtrsim9 GeV particle decaying into e+e− at a redshift of z ~ 5, in a magnetic field of ~ 5μG, which exceeds the CMB B-field constraints, unless the field was generated after decoupling. Decays into exotic millicharged particles can alleviate this tension, if they emit synchroton radiation in conjunction with a sufficiently large background magnetic field of a dark U(1)' gauge field.
dc.relation.ispartof Journal Of Cosmology And Astroparticle Physics, 2013
dc.subject Física
dc.title Cosmological origin of anomalous radio background
dc.type journal article es_ES
dc.date.updated 2014-02-19T10:52:48Z
dc.identifier.doi 10.1088/1475-7516/2013/02/011
dc.identifier.idgrec 093178
dc.rights.accessRights open access es_ES
dc.identifier.url 10.1088/1475-7516/2013/02/011

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