Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Small-scale clumps in the galactic halo and dark matter annihilation   Production of small-scale DM clumps is studied in the standard cosmological
scenario with an inflation-produced primeval fluctuation spectrum. Special
attention is given to three following problems: (i) The mass spectrum of
small-scale clumps with $M \lesssim 10^3 M_{\odot}$ is calculated with tidal
destruction of the clumps taken into account within the hierarchical model of
clump structure. Only 0.1 - 0.5% of small clumps survive the stage of tidal
destruction in each logarithmic mass interval $\Delta\ln M\sim1$. (ii) The mass
distribution of clumps has a cutoff at $M_{\rm min}$ due to diffusion of DM
particles out of a fluctuation and free streaming at later stage. $M_{\rm min}$
is a model dependent quantity. In the case the neutralino, considered as a pure
bino, is a DM particle, $M_{\rm min} \sim 10^{-8} M_{\odot}$. (iii) The
evolution of density profile in a DM clump does not result in the singularity
because of formation of the core under influence of tidal interaction. The
radius of the core is $R_c \sim 0.1 R$, where $R$ is radius of the clump. The
applications for annihilation of DM particles in the Galactic halo are studied.
The number density of clumps as a function of their mass, radius and distance
to the Galactic center is presented. The enhancement of annihilation signal due
to clumpiness, valid for arbitrary DM particles, is calculated. In spite of
small survival probability, the annihilation signal in most cases is dominated
by clumps. For observationally preferable value of index or primeval
fluctuation spectrum $n_p \approx 1$, the enhancement of annihilation signal is
described by factor 2 - 5 for different density profiles in a clump.

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The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys