Analysis of branon dark matter and extra-dimensional models with AMS-02

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Cruz Dombriz, Álvaro de la
Dunsby, Dunsby
Méndez-Isla, Miguel
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Elsevier Science BV
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In the context of brane-world extra-dimensional theories, we compute the positron production from branon dark matter annihilations and compare with the AMS-02 data. Three different scenarios have been considered; the first two assume that either pulsars or dark matter may explain separately the whole positron fraction as measured by AMS-02, whereas the third one assumes that a suitable combination of these two contributions is needed. For all of them, exclusion diagrams for the brane mass and the tension of the brane, were obtained. Our analysis has been performed for a minimal, a medium and a maximum diffusion model in one extra dimension for both pseudo-Isothermal and Navarro-Frenk-White dark matter halos. Combined with previous cosmological analyses and experimental data in colliders, constraints here enable us to set further bounds on the parameter space of branons. In particular, in the case when pulsars fit the whole AMS-02 data, we have excluded mass-tension regions for masses and tensions smaller than 60.75 TeV and 8.56 TeV respectively. With regard to the scenario in which AMS-02 data are explained by a combination of dark matter and pulsars, masses and tensions smaller than 27.32 TeV and 3.85 TeV respectively turn out to be excluded. Finally, in the scenario with no pulsar contribution, a branon with a mass 38.1 +/- 0.2 TeV and a tension 4.99 +/- 0.04 TeV can fit well the experimental data. (C) 2019 Published by Elsevier B.V.
©2019 Published by Elsevier B.V. This is an open access article under the CC BY license This work was partly supported by the projects FIS2014-52837-P (Spanish MINECO) and FIS2016-78859-P (AEI/FEDER, UE), and Consolider-Ingenio MULTIDARK CSD2009-00064. AdlCD acknowledges financial support from projects FPA2014-53375-C2-1-P Spanish Ministry of Economy and Science, FIS2016-78859-P European Regional Development Fund and Spanish Research Agency (AEI), CA15117 CANTATA and CA16104 COST Actions EU Framework Programme Horizon 2020, CSIC I-LINK1019 Project, Spanish Ministry of Economy and Science, University of Cape Town Launching Grants Programme and National Research Foundation grants 99077 2016-2018 (Ref. No. CSUR150628121624), 110966 Ref. No. BS1705-09230233 and the NRF Incentive Funding for Rated Researchers, Ref. No. IFR170131220846. AdlCD would like to thank the Abdus Salam International Centre for Theoretical Physics (ICTP, Trieste) for its hospitality in the latest stages of the manuscript. PKSD acknowledges NRF for financial support. MMI thanks Carlos Munoz (IFT/CSIC-UAM), Roy Maartens (UWC) and Roberto Lineros (IFIC) for useful discussions and acknowledges financial support from the University of Cape Town Doctoral Fellowships and the Erasmus+ Alliance-4-Universities Mobility Programme.
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