Merger of dark matter axion clumps and resonant photon emission
Hertzberg, M. P., Li, Y., & Schiappacasse, E. D. (2020). Merger of dark matter axion clumps and resonant photon emission. Journal of Cosmology and Astroparticle Physics, 2020(7), Article 067. https://doi.org/10.1088/1475-7516/2020/07/067
Published inJournal of Cosmology and Astroparticle Physics
© 2020 IOP Publishing Ltd and Sissa Medialab
A portion of light scalar dark matter, especially axions, may organize into gravitationally bound clumps (stars) and be present in large number in the galaxy today. It is therefore of utmost interest to determine if there are novel observational signatures of this scenario. Work has shown that for moderately large axion-photon couplings, such clumps can undergo parametric resonance into photons, for clumps above a critical mass Mਮc determined precisely by some of us in ref. . In order to obtain a clump above the critical mass in the galaxy today would require mergers. In this work we perform full 3-dimensional simulations of pairs of axion clumps and determine the conditions under which mergers take place through the emission of scalar waves, including analyzing head-on and non-head-on collisions, phase dependence, and relative velocities. Consistent with other work in the literature, we find that the final mass from the merger Mਮfinal≈ 0.7(Mਮ1+Mਮ2) is larger than each of the original clump masses (for Mਮ1∼ Mਮ2). Hence, it is possible for sub-critical mass clumps to merge and become super-critical and therefore undergo parametric resonance into photons. We find that mergers are expected to be kinematically allowed in the galaxy today for high Peccei-Quinn scales, which is strongly suggested by unification ideas, although the collision rate is small. While mergers can happen for axions with lower Peccei-Quinn scales due to statistical fluctuations in relative velocities, as they have a high collision rate. We estimate the collision and merger rates within the Milky Way galaxy today. We find that a merger leads to a flux of energy on earth that can be appreciable and we mention observational search strategies. ...
PublisherInstitute of Physics
Publication in research information system
MetadataShow full item record
Showing items with similar title or keywords.
Event-by-event hydrodynamics and thermal photon production in ultrarelativistic heavy ion collisions Holopainen, Hannu (University of Jyväskylä, 2011)
Alanne, Tommi (University of Jyväskylä, 2015)In this thesis, we discuss ideas of how to go beyond the Standard Model (SM) of particle physics to incorporate the cosmological observations of dark matter and matter–antimatter asymmetry, and to address the theoretical ...
Yrjänheikki, Sami (2022)Tässä opinnäytetyössä johdetaan ekvivalentti fotoniapproksimaatio ja siihen liittyvä ekvivalentti fotonijakauma yhden ja kahden fotonivaihdon prosesseissa helisiteettipohjaista menetelmää käyttäen kvanttikenttäteorian ...
Direct photon production at low transverse momentum in proton-proton collisions at √s = 2.76 and 8 TeV ALICE Collaboration (American Physical Society, 2019)Measurements of inclusive and direct photon production at midrapidity in pp collisions at √s=2.76 and 8 TeV are presented by the ALICE experiment at the LHC. The results are reported in transverse momentum ranges of 0.4<pT<10 ...
Laakkonen, Linda (2019)Tutkielma tehtiin yhteistyössä Varian Medical Systems Finland -yrityksen kanssa. Tutkielmassa keskityttiin ulkoiseen alle 15 MeV energian säteilylähteseen, jolla tarkoitetaan yleensä sitä, että säteilykeila on tuotettu ...