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Updated: Sep 4, 2025

Spatial Separation of Molecular Conformers and Clusters
Published on: January 9, 2014
Constraining Heavy Axionlike Particles by Energy Deposition in Globular Cluster Stars
Giuseppe Lucente1,2, Oscar Straniero3,4, Pierluca Carenza5
1Dipartimento Interateneo di Fisica "Michelangelo Merlin," Via Amendola 173, 70126 Bari, Italy.
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}≲0.4 MeV and g_{aγ}≃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.
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