Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Accurate modelling of extragalactic microlensing by compact objects   Microlensing of extragalactic sources, in particular the probability of
significant amplifications, is a potentially powerful probe of the abundance of
compact objects outside the halo of the Milky Way. Accurate experimental
constraints require an equally accurate theoretical model for the amplification
statistics produced by such a population. In this article, we argue that the
simplest (strongest-lens) model does not meet this demanding requirement. We
thus propose an elaborate practical modelling scheme for extragalactic
microlensing. We derive from first principles an expression for the
amplification probability that consistently allows for: (i) the coupling
between microlenses; (ii) realistic perturbations from the cosmic large-scale
structure; (iii) extended-source corrections. An important conclusion is that
the external shear applied on the dominant microlens, both by the other lenses
and by the large-scale structure, is practically negligible. Yet, the
predictions of our approach can still differ by a factor of a few with respect
to existing models of the literature. Updated constraints on the abundance of
compact objects accounting for such discrepancies may be required.

16
The categories of this paper are: stat
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs