Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Power spectrum of radiation from a Gaussian source microlensed by a
  point mass: analytic results   Gravitational lensing deals with general-relativistic effects in the
propagation of electromagnetic radiation. We consider wavelength-dependent
contributions in case of a (micro)lensing of an extended Gaussian source by a
point mass under standard assumptions about the incoherent emission of
different source elements. Analytical expressions for the power spectrum of a
microlensed radiation, which are effective in case of a large source, are
obtained. If the source center, the mass, and an observer are on a straight
line, the power spectrum is found in a closed form in terms of a hypergeometric
function. In the case of general locations of the lens and the source, the
result is presented in the form of a series. Approximate analytic expressions
for the power spectrum in the case of a large source and high frequencies are
obtained.

31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph