Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct determination of cosmic string loop density from simulations   We determine the distribution of cosmic string loops directly from
simulations, rather than determining the loop production function and inferring
the loop distribution from that. For a wide range of loop lengths, the results
agree well with a power law exponent -2.5 in the radiation era and -2 in the
matter era, the universal result for any loop production function that does not
diverge at small scales. Our results extend those of Ringeval, Sakellariadou,
and Bouchet: we are able to run for 15 times longer in conformal time and
simulate a volume 300-2400 times larger. At the times they reached, our
simulation is in general agreement with the more negative exponents they found,
-2.6 and -2.4. However, our simulations show that this was a transient regime;
at later times the exponents decline to the values above. This provides further
evidence against models with a rapid divergence of the loop density at small
scales, such as ``model 3'' used to analyze LIGO data and predict LISA
sensitivity.

28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph