Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Cyclic Universe Approach to Fine Tuning   We present a closed bouncing universe model where the value of coupling
constants is set by the dynamics of a ghost-like dilatonic scalar field. We
show that adding a periodic potential for the scalar field leads to a cyclic
Friedmann universe where the values of the couplings vary randomly from one
cycle to the next. While the shuffling of values for the couplings happens
during the bounce, within each cycle their time-dependence remains safely
within present observational bounds for physically-motivated values of the
model parameters. Our model presents an alternative to solutions of the fine
tuning problem based on string landscape scenarios.

20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg