Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Temperature measurements of a Bose--Einstein condensate by
  ultra--intense light pulses   Experimentally the temperature in a Bose--Einstein condensate is always
deduced resorting to the comparison between the Maxwell--Boltzmann velocity
distribution function and the density profile in momentum space. Though a
successful method it is an approximation, since it also implies the use of
classical statistical mechanics at temperatures close to the condensation
temperature where quantal effects play a relevant role. The present work puts
forward a new method in which we use an ultra--intense light pulse and a
nonlinear optical material as detectors for differences in times--of--flight.
This experimental value shall be compared against the result here calculated,
using the Bose--Einstein distribution function, which is a
temperature--dependent variable, and in this way the temperature of the
condensate is obtained.

20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom