Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Curing black hole singularities with local scale invariance   We show that Weyl-invariant dilaton gravity provides a description of black
holes without classical spacetime singularities. Singularities appear due to
ill-behaviour of gauge fixing conditions, one example being the gauge in which
theory is classically equivalent to standard General Relativity. The main
conclusions of our analysis are: (1) singularities signal a phase transition
from broken to unbroken phase of Weyl symmetry, (2) instead of a singularity
there is a "baby-universe" or a white hole inside a black hole, (3) in the baby
universe scenario there is a critical mass after which reducing mass makes
black hole larger as viewed by outside observers, (4) if a black hole could be
connected with white hole through the "singularity", this would require
breakdown of (classical) geometric description, (5) the singularity of
Schwarzschild BH solution is non-generic and so it is dangerous to rely on it
in deriving general results. Our results may have important consequences for
resolving issues related to information-loss puzzle. The theory we use is
basically a completion of General Relativity, containing neither additional
physical excitations nor higher-derivative terms, but requires physical scalar
field such as Higgs field of Standard Model. Though quantum effects are still
crucial and may change the proposed classical picture, a position of building
quantum theory around essentially regular classical solutions normally provides
a much better starting point.

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The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: alg-geom
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The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: hep-lat
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
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The categories of this paper are: nlin
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The categories of this paper are: mtrl-th
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The categories of this paper are: math