Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Navigating the asteroid field: New evaporation constraints for
  primordial black holes as dark matter   Primordial black holes (PBHs) in the asteroid-mass range
$(10^{-17}$--$10^{-12})~M_{\odot}$ almost entirely escape constraints as dark
matter candidates. In the early universe, however, the Schwarzschild metric is
no longer applicable and we must carefully consider PBH metrics with a proper
cosmological embedding. In particular, the Thakurta solution stands out as
perhaps the most adequate such solution. Notably, the Thakurta metric contains
a time-dependent apparent horizon, proportional to the cosmological
scale-factor. We show that this implies the PBHs are hotter than in the
standard Schwarzschild case, and so evaporate significantly faster via Hawking
radiation. By matter-radiation equality, PBHs up to masses of $\sim
10^{-12}~M_{\odot}$ have totally evaporated, and so cannot be a viable dark
matter candidate.

31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th