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


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Tipologia del documento: Tesi di dottorato
Lingua: English
Titolo: Radio constraints on dark matter annihilation in the galactic halo and its substructures
Data: 29 Novembre 2008
Numero di pagine: 77
Istituzione: Università degli Studi di Napoli Federico II
Dipartimento: Scienze fisiche
Dottorato: Fisica fondamentale ed applicata
Ciclo di dottorato: 21
Coordinatore del Corso di dottorato:
Data: 29 Novembre 2008
Numero di pagine: 77
Parole chiave: dark matter
Settori scientifico-disciplinari del MIUR: Area 02 - Scienze fisiche > FIS/02 - Fisica teorica, modelli e metodi matematici
Depositato il: 12 Nov 2009 09:11
Ultima modifica: 02 Dic 2014 10:44
DOI: 10.6092/UNINA/FEDOA/3242


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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