Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum effects, brane tension and large hierarchy in the brane-world   Semiclassical Einstein's equation in five-dimension with a negative
cosmological constant and conformally invariant bulk matter fields is examined
in the brane world scenario with the S^1/Z_2 compactification. When numbers
N_{b,f} of bosonic and fermionic fields satisfy I<\kappa^2l^{-3}(N_b-N_f)<32I,
we obtain an exact semiclassical solution which has two static branes with
positive tension and for which the warp factor can be arbitrarily large. Here,
\kappa^2 is the five-dimensional gravitational constant, l is a length scale
determined by the negative five-dimensional cosmological constant, and $I$ is a
dimensionless positive constant of order unity. However, in order to obtain a
large warp factor, fine tuning of brane tensions is required. Hence, in order
to solve the hierarchy problem, we need to justify the fine tuning by another
new mechanism.

17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex