The 3.5 keV line from stringy axions
Abstract An interesting result in particle astrophysics is the recent detection of an unexplained 3.5 keV line from galaxy clusters. A promising model, which can explain the morphology of the signal and its non-observation in dwarf spheroidal galaxies, involves a 7keV dark matter particle decaying i...
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doaj-b7a6545561394b0d8943cbfcf596ed2c2020-11-24T21:48:24ZengSpringerOpenJournal of High Energy Physics1029-84792017-10-0120171013810.1007/JHEP10(2017)192The 3.5 keV line from stringy axionsMichele Cicoli0Victor A. Diaz1Veronica Guidetti2Markus Rummel3Dipartimento di Fisica e Astronomia, Università di BolognaDipartimento di Fisica e Astronomia, Università di BolognaDipartimento di Fisica e Astronomia, Università di BolognaDepartment of Physics & Astronomy, McMaster UniversityAbstract An interesting result in particle astrophysics is the recent detection of an unexplained 3.5 keV line from galaxy clusters. A promising model, which can explain the morphology of the signal and its non-observation in dwarf spheroidal galaxies, involves a 7keV dark matter particle decaying into a pair of ultra-light axions that convert into photons in the magnetic field of the clusters. Given that light axions emerge naturally in 4D string vacua, in this paper we present a microscopic realisation of this model within the framework of type IIB flux compactifications. Dark matter is a local closed string axion which develops a tiny mass due to subdominant poly-instanton corrections to the superpotential and couples via kinetic mixing to an almost massless open string axion living on a D3-brane at a singularity. The interaction of this ultra-light axion with photons is induced by U(1) kinetic mixing. After describing the Calabi-Yau geometry and the brane set-up, we discuss in depth moduli stabilisation, the resulting mass spectrum and the strength of all relevant couplings.http://link.springer.com/article/10.1007/JHEP10(2017)192Compactification and String ModelsCosmology of Theories beyond the SMSuperstring Vacua |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Michele Cicoli Victor A. Diaz Veronica Guidetti Markus Rummel |
spellingShingle |
Michele Cicoli Victor A. Diaz Veronica Guidetti Markus Rummel The 3.5 keV line from stringy axions Journal of High Energy Physics Compactification and String Models Cosmology of Theories beyond the SM Superstring Vacua |
author_facet |
Michele Cicoli Victor A. Diaz Veronica Guidetti Markus Rummel |
author_sort |
Michele Cicoli |
title |
The 3.5 keV line from stringy axions |
title_short |
The 3.5 keV line from stringy axions |
title_full |
The 3.5 keV line from stringy axions |
title_fullStr |
The 3.5 keV line from stringy axions |
title_full_unstemmed |
The 3.5 keV line from stringy axions |
title_sort |
3.5 kev line from stringy axions |
publisher |
SpringerOpen |
series |
Journal of High Energy Physics |
issn |
1029-8479 |
publishDate |
2017-10-01 |
description |
Abstract An interesting result in particle astrophysics is the recent detection of an unexplained 3.5 keV line from galaxy clusters. A promising model, which can explain the morphology of the signal and its non-observation in dwarf spheroidal galaxies, involves a 7keV dark matter particle decaying into a pair of ultra-light axions that convert into photons in the magnetic field of the clusters. Given that light axions emerge naturally in 4D string vacua, in this paper we present a microscopic realisation of this model within the framework of type IIB flux compactifications. Dark matter is a local closed string axion which develops a tiny mass due to subdominant poly-instanton corrections to the superpotential and couples via kinetic mixing to an almost massless open string axion living on a D3-brane at a singularity. The interaction of this ultra-light axion with photons is induced by U(1) kinetic mixing. After describing the Calabi-Yau geometry and the brane set-up, we discuss in depth moduli stabilisation, the resulting mass spectrum and the strength of all relevant couplings. |
topic |
Compactification and String Models Cosmology of Theories beyond the SM Superstring Vacua |
url |
http://link.springer.com/article/10.1007/JHEP10(2017)192 |
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