Heavy axionlike particles (ALPs) with masses up to a few 100 keV and coupled with photons can be efficiently produced in stellar plasmas. We present a new "ballistic" recipe that covers both the energy-loss and energy-transfer regimes, and we perform the first dedicated simulation of Globular Cluster stars including the ALP energy transfer. This argument allows us to constrain ALPs with m(a) less than or similar to 0.4 MeV and g(a gamma) similar or equal to 10(-5) GeV-1, probing a section of the ALP parameter space informally known as the "cosmological triangle". This region is particularly interesting since it has been excluded only using standard cosmological arguments that can be evaded in nonstandard scenarios.
Constraining Heavy Axionlike Particles by Energy Deposition in Globular Cluster Stars
Giuseppe Lucente;Pierluca Carenza;Alessandro Mirizzi
2022-01-01
Abstract
Heavy axionlike particles (ALPs) with masses up to a few 100 keV and coupled with photons can be efficiently produced in stellar plasmas. We present a new "ballistic" recipe that covers both the energy-loss and energy-transfer regimes, and we perform the first dedicated simulation of Globular Cluster stars including the ALP energy transfer. This argument allows us to constrain ALPs with m(a) less than or similar to 0.4 MeV and g(a gamma) similar or equal to 10(-5) GeV-1, probing a section of the ALP parameter space informally known as the "cosmological triangle". This region is particularly interesting since it has been excluded only using standard cosmological arguments that can be evaded in nonstandard scenarios.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
