Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hydrodynamic fluctuations of entropy in one-dimensionally expanding
  system   The fluctuation-dissipation relation tells that dissipation always
accompanies with thermal fluctuations. Relativistic fluctuating hydrodynamics
is used to study the effects of the thermal fluctuations in the hydrodynamic
expansion of the quark-gluon plasma created in the high-energy nuclear
collisions. We show that the thermal noise obeys the steady-state fluctuation
theorem when (i) the time scales of the evolution of thermodynamic quantities
are sufficiently longer than the relaxation time, and (ii) the thermal
fluctuations of temperature are sufficiently small. The steady-state
fluctuation theorem describes the distribution of the entropy which can be
related to the multiplicity observed in high-energy nuclear collisions. As a
consequence, we propose an upper bound to the multiplicity fluctuations which
is useful to test the initial state models. We also numerically investigate
breaking of the steady-state fluctuation theorem due to the non-vanishing
relaxation time in real nuclear collisions.

2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga