Recent developments in the modelling of the dark matter distribution in our Galaxy point out the necessity to consider some physical processes to satisfy observational data. In particular, models with adiabatic compression, which include the effect of the baryonic gas in the halo, increase significantly the dark matter density in the central region of the Milky Way. On the other hand, the non-universality in the scalar and gaugino sectors of supergravity models can also increase significantly the neutralino annihilation cross section. We show that the combination of both effects gives rise to a gammaray flux arising from the galactic centre largely reachable by future experiments like GLAST.
JCAP01(2006)010Adiabatic compression and indirect detection of supersymmetric dark matter has been carried out imposing the most recent experimental constraints, such as the lower bound on the Higgs mass, the b → sγ branching ratio, and the muon g − 2. In addition, the recently improved upper bound on B(B s → µ + µ − ) has also been taken into account. The astrophysical (WMAP) bounds on the dark matter density have also been imposed on the theoretical computation of the relic neutralino density through thermal production.Keywords: dark matter, high energy photons, cosmology of theories beyond the SM, structure of galaxies ArXiv ePrint: hep-ph/0506204 Journal of Cosmology and Astroparticle Physics 01 (2006) 010 (stacks.iop.org/JCAP/2006/i=01/a=010) Journal of Cosmology and Astroparticle Physics 01 (2006) 010 (stacks.iop.org/JCAP/2006/i=01/a=010) Journal of Cosmology and Astroparticle Physics 01 (2006) 010 (stacks.iop.org/JCAP/2006/i=01/a=010) 8 For analytical derivations see e.g. the recent work [42], and references therein. 9 It is worth noticing that we obtain the same order of magnitude as the authors of [48]. Journal of Cosmology and Astroparticle Physics 01 (2006) 010 (stacks.iop.org/JCAP/2006/i=01/a=010) 12 Although alternative explanations for this result have been proposed modifying conveniently the standard theory of galactic gamma-ray [61], these turn out to be also controversial [62]. 13 See also [29] for a general analysis. Journal of Cosmology and Astroparticle Physics 01 (2006) 010 (stacks.iop.org/JCAP/2006/i=01/a=010)
The PbTiO3 thin film was deposited on Si(100) with Y2O3 and CeO2 buffer layers. Y2O3, CeO2 and PbTiO3 layers were fabricated by the in-situ pulsed laser deposition (PLD) technique. X-ray diffraction (XRD) analysis revealed that the Y2O3 and CeO2 layers were (222) and (200) preferential orientation, respectively. PbTiO3 showed (100)+(001) mixed texture on CeO2/Si and polycrystalline on Y2O3/Si, respectively. Characterization of the grazing angle incident X-ray diffraction showed that the stress depth profile of the PbTiO3 thin film on CeO2/Si(100) was not uniform. The secondary ion mass spectroscopy (SIMS) analysis indicated that the CeO2 and Y2O3 layers reduced significantly the interdiffusion of Si atoms into PbTiO3 and that the distributions of Pb and Ti elements were uniform throughout the PbTiO3 layer. The columnar crystallization of CeO2, Y2O3, and PbTiO3 films were observed by scanned electron microsopy (SEM).
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