Axion-Photon Coupling: Astrophysical Constraints

Straniero, Oscar; Giannotti, Maurizio; Mirizzi, Alessandro; Ayala, Adrian; Dominguez, Inma

Contribution to a conference proceedings/Contribution to a book

PUBDB-2017-00134

Axion-Photon Coupling: Astrophysical Constraints

Straniero, O. ; Ayala, A. ; Giannotti, M. ; Mirizzi, A. ; Dominguez, I.

2015
Verlag Deutsches Elektronen-Synchrotron Hamburg
ISBN: 978-3-935702-43-0

Straniero, Oscar "Axion-Photon Coupling: Astrophysical Constraints" in Proceedings, 11th Patras Workshop on Axions, WIMPs and WISPs (Axion-WIMP 2015) / Irastorza, Igor G., Redondo, Javier, Carmona, José Manuel, Cebrian, Susana, Dafni, Theopisti, Iguaz, Francisco J., Luzon, Gloria (eds.), Verlag Deutsches Elektronen-Synchrotron : 2015 ; AXION-WIMP 2015 : 11th Patras Workshop on Axions, WIMPs and WISPs, 2015-06-22 - 2015-06-26, Zaragoza
11th Patras Workshop on Axions, WIMPs and WISPs, AXION-WIMP 2015, Zaragoza, Spain, 22 Jun 2015 - 26 Jun 2015 Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-PROC 77-81 (2015) [10.3204/DESY-PROC-2015-02/straniero_oscar]

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Please use a persistent id in citations: doi:10.3204/DESY-PROC-2015-02/straniero_oscar

Abstract: We revise the astrophysical bound to the axion-photon coupling, as obtained by comparing $R=N_{HB}/N_{RGB}$, the ratio of the numbers of stars observed in the Horizontal Branch (HB) and in the Red Giant Branch (RGB) of 39 Galactic Globular Clusters with up-to-date theoretical predictions. First results have already been published in a PRL paper in 2014. Here we present a new and more accurate method to calculate the theoretical $R$, which makes use of synthetic Color-Magnitude diagrams to be directly compared to the observed (real) diagrams. Preliminary results of our analysis are discussed.

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