Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Revival of White Holes as Small Bangs   Black holes are extremely dense and compact objects from which light cannot
escape. There is an overall consensus that black holes exist and many
astronomical objects are identified with black holes. White holes were
understood as the exact time reversal of black holes, therefore they should
continuously throw away material. It is accepted, however, that a persistent
ejection of mass leads to gravitational pressure, the formation of a black hole
and thus to the "death of while holes". So far, no astronomical source has been
successfully tagged a white hole. The only known white hole is the Big Bang
which was instantaneous rather than continuous or long-lasting. We thus suggest
that the emergence of a white hole, which we name a 'Small Bang', is
spontaneous - all the matter is ejected at a single pulse. Unlike black holes,
white holes cannot be continuously observed rather their effect can only be
detected around the event itself. Gamma ray bursts are the most energetic
explosions in the universe. Long gamma-ray bursts were connected with supernova
eruptions. There is a new group of gamma-ray bursts, which are relatively close
to Earth, but surprisingly lack any supernova emission. We propose identifying
these bursts with white holes. White holes seem like the best explanation of
gamma-ray bursts that appear in voids. We also predict the detection of rare
gigantic gamma-ray bursts with energies much higher than typically observed.

20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ