Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Primordial black holes and dark matter mass spectrum   Since primordial black holes (PBHs) evaporate into all particle species in
nature, a large number of dark matter (DM) particle species with specific mass
spectrum may be emitted from PBHs. We assume that PBHs are the only source of
DMs, and DMs only interact with the standard model particles gravitationally.
We investigate whether the number of DM particle species $N_{\rm DM}$ could be
determined from initial PBH density $\beta$ and initial PBH mass $M_{\rm
BH}^{\rm in}$. It turned out that if there are too many heavy DM particle
species in DM mass spectrum, the determination of $N_{\rm DM}$ via $\beta$ and
$M_{\rm BH}^{\rm in}$ may tend to be difficult for heavy initial PBHs.

31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn