17,906 research outputs found
Dark Spinors Hawking Radiation in String Theory Black Holes
The Hawking radiation spectrum of Kerr-Sen axion-dilaton black holes is
derived, in the context of dark spinors tunnelling across the horizon. Since a
black hole has a well defined temperature, it should radiate in principle all
the standard model particles, similar to a black body at that temperature. We
investigate the tunnelling of mass dimension one spin-1/2 dark fermions, that
are beyond the standard model and are prime candidates to the dark matter.
Their interactions with the standard model matter and gauge fields are
suppressed by at least one power of unification scale, being restricted just to
the Higgs field and to the graviton likewise. The tunnelling method for the
emission and absorption of mass dimension one particles across the event
horizon of Kerr-Sen axion-dilaton black holes is shown here to provide further
evidence for the universality of black hole radiation, further encompassing
particles beyond the standard model.Comment: 11 pages, improved version, to appear in AHE
Aspects of open-flavour mesons in a comprehensive DSBSE study
Open-flavour meson studies are the necessary completion to any comprehensive
investigation of quarkonia. We extend recent studies of quarkonia in the
Dyson-Schwinger-Bethe-Salpeter-equation approach to explore their results for
all possible flavour combinations. Within the inherent limitations of the
setup, we present the most comprehensive results for meson masses and leptonic
decay constants currently available and put them in perspective with respect to
experiment and other approaches.Comment: 38 pages, 26 figures, 2 tables, revised according to reviewer
comment
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