Borriello, Enrico (2008) Radio constraints on dark matter annihilation in the galactic halo and its substructures. [Tesi di dottorato] (Unpublished)


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Item Type: Tesi di dottorato
Resource language: English
Title: Radio constraints on dark matter annihilation in the galactic halo and its substructures
Date: 29 November 2008
Number of Pages: 77
Institution: Università degli Studi di Napoli Federico II
Department: Scienze fisiche
Dottorato: Fisica fondamentale ed applicata
Ciclo di dottorato: 21
Coordinatore del Corso di dottorato:
Date: 29 November 2008
Number of Pages: 77
Keywords: dark matter
Settori scientifico-disciplinari del MIUR: Area 02 - Scienze fisiche > FIS/02 - Fisica teorica, modelli e metodi matematici
Date Deposited: 12 Nov 2009 09:11
Last Modified: 02 Dec 2014 10:44
DOI: 10.6092/UNINA/FEDOA/3242

Collection description

Annihilation of Dark Matter usually produces together with gamma rays comparable amounts of electrons and positrons. The e+e-; gyrating in the galactic magnetic field then produce secondary synchrotron radiation which thus provides an indirect mean to constrain the DM signal itself. To this purpose, we calculate the radio emission from the galactic halo as well as from its expected substructures and we then compare it with the measured diffuse radio background. We employ a multi-frequency approach using data in the relevant frequency range 100 MHz-100 GHz, as well as the WMAP haze at 23 GHz. The derived constraints are of the order <sigmaAv> = 10^{-24} cm^3s^{-1} for a DM mass m = 100 GeV sensibly depending however on the astrophysical uncertainties, in particular on the assumption on the galactic magnetic field model. The signal from single bright clumps is instead largely attenuated by diffusion effects and offers only poor prospects of detection.


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