Thursday, January 17, 2013

1301.3668 (Anirban Biswas et al.)

Two Component Dark Matter : A Possible Explanation of 130 GeV $γ-$
Ray Line from the Galactic Centre
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Anirban Biswas, Debasish Majumdar, Arunansu Sil, Pijushpani Bhattacharjee
Recently Fermi-LAT satellite borne experiment has observed the existence of 130 GeV monochromatic $\gamma$-ray line from the direction of galactic centre. Analyses of these Fermi-LAT data appear to rule out other astrophysical possibilities for the observed 130 GeV $\gamma$-line and strongly suggest this to be originated from the Dark Matter annihilation at the galactic centre region. In this work we propose a two component Dark Matter scenario where the relic densities of both the components add up to produce the Dark Matter relic density given by the WMAP experiment. Such a Dark Matter scenario is invoked by proposing a scalar singlet + inert doublet model where a singlet scalar field and an inert scalar doublet field are added to the standard model whereby the potential due to the proposed model is even under $Z_2 \times Z_2'$ symmetry. Also both the singlet scalar and inert doublet parts do not produce any VEV. These ensure the stability of both the components (inert doublet and scalar singlet) of the Dark Matter in the present model. Under this framework, we show that the inert doublet component of this two component Dark Matter scenario may indeed explain the 130 GeV $\gamma$-ray line observed by Fermi-LAT. It is also shown that each single component (scalar singlet or inert doublet) cannot individually explain the 130 GeV $\gamma$-line.
View original: http://arxiv.org/abs/1301.3668

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