Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Massive Primordial Black Holes   A review of the astronomical data of several last years on an astonishingly
high amount of black holes in the contemporary and early ($z\sim 10$) universe
is presented. Also the data on the recently observed peculiar stars in the
Galaxy are discussed. It is argued that practically all black holes in the
universe are primordial (PBH) and suggested that an inverted picture of the
galaxy formation is realized: supermassive black holes were formed prior to
galaxy formation and subsequently seeded the latter. Possibilities of
cosmological dark matter consisting of primordial black holes and of abundant
cosmological antimatter are considered.
  A mechanism of 1993 anticipating all these phenomena and predicting an
extended log-normal mass spectrum of PBH is described.

35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ