Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-02-03
Phys.Lett.B325:136-142,1994
Physics
High Energy Physics
High Energy Physics - Phenomenology
Plain TeX 11 pages 4 figures available on request. Preprint numbers LNGS 94/90 - DFTT 5/94
Scientific paper
10.1016/0370-2693(94)90083-3
We study the NGS (Non--dissipative Gravitational Singularity) model, which successfully describes the non--linear stage of evolution of perturbations (see [1], [2] and references therein). This model predicts DM density distribution $\rho(r) \sim r^{-\alpha}$ with $\alpha \simeq 1.8$ which holds from very small distances $r_{\rm min} \simeq 0.01~{\rm pc}$ up to very large distances $r_{\rm max} \simeq 5~{\rm Mpc}$. Assuming the neutralino to be a CDM particle, we calculate the annihilation of neutralinos in the vicinity of the singularity (Galactic Center). If neutralinos are the dominant component of DM in our Galaxy, the produced energy is enough to provide the whole observed activity of the GC. Neutralinos of the most general composition and of mass in the range $20~{\rm GeV} \leq m_\c \leq 1~{\rm TeV}$ are considered. We find the neutralino compositions which give the relic density needed for the Mixed Dark Matter (MDM) model and we evaluate for these compositions the high--energy ($E_{\gamma} > 100 ~{\rm MeV}$) gamma--ray flux under the constraint that the radio flux is lower than the observational limit. The compositions with the detectable gamma--ray flux which we found are provided by a set of almost pure gaugino states with the neutralino mass between $100$ and $500$ GeV. We demonstrate that a detectable high--energy gamma--ray flux is produced by the neutralino annihilation also in the case when neutralinos provide a small fraction (down to $0.1 \%$) of the DM in our Galaxy. The predicted flux is $F_\gamma \sim 10^{-7}-10^{-8}~{\rm cm}^{-2}~{\rm s}^{-1}$ for $E_\gamma \gsim 300~{\rm MeV}$
Berezinsky Veniamin
Bottino Alberto
Mignola G.
No associations
LandOfFree
High Energy Gamma--Radiation from the Galactic Center due to Neutralino Annihilation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with High Energy Gamma--Radiation from the Galactic Center due to Neutralino Annihilation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High Energy Gamma--Radiation from the Galactic Center due to Neutralino Annihilation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-494253