Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Causal horizons and topics in structure formation   This is a write-up of a talk given at the Opava RAGtime meeting in 2011, but
it has been updated to include some subsequent related developments. The talk
focused on discussion of some aspects of black hole and cosmological horizons
under rather general circumstances, and on two different topics related to
formation of cosmological structures at different epochs of the universe:
virialization of cold dark matter during standard structure formation in the
matter-dominated era, and primordial black hole formation during the radiative
era.

30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn