Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Microlensing due to both gravitation and refraction as a further probe
  of universe evolution   Microlensings events are predicted for the light coming from cosmological
sources. In addition to the microlensing due to gravitation lensing,
microlensing produced also by refraction of light due to either ionized, or
not, gas clouds can be considered. A detailed prediction is here given assuming
that the ray of light coming from the distant source traverses a gas cloud with
a King's density profile for various possible environments. We conclude that
the additional deviation due to relativistic refraction is in most cases
negligible compared to the gravitational deviation. Deviation due to refraction
can anyway become an interesting analysis tool for future facility with great
resolving power and the effects can be singled out with dedicated surveys.

10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex