Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing the Era of Galaxy Formation via TeV Gamma Ray Absorption by the
  Near Infrared Extragalactic Background   We present models of the extragalactic background light (EBL) based on
several scenarios of galaxy formation and evolution. We have treated galaxy
formation with the Press-Schecter approximation for both cold dark matter (CDM)
and cold+hot dark matter (CHDM) models. Galaxy evolution has been treated by
considering a variety of stellar types, different initial mass functions and
star formation histories, and with an accounting of dust absorption and
emission. We find that the dominant factor influencing the EBL is the epoch of
galaxy formation. A recently proposed method for observing the EBL utilizing
the absorption of $\sim 0.1$ to 10 TeV gamma-rays from active galactic nuclei
(AGN) is shown to be capable of discriminating between different galaxy
formation epochs. Observations of TeV gamma-ray bursts (GRB) would constrain or
eliminate models in which the GRB sources lie at cosmological distances.

32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat