Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Light-cone observations and cosmological models: implications for
  inhomogeneous models mimicking dark energy   Cosmological observables are used to construct cosmological models. Since
cosmological observations are limited to the light cone, a fixed number of
observables (even measured to arbitrary accuracy) may not uniquely determine a
cosmological model without additional assumptions or considerations. A
prescription for constructing a spherically symmetric, inhomogeneous
cosmological model that exactly reproduces the luminosity-distance as a
function of redshift and the light-cone mass density as a function of redshift
of a $\Lambda$CDM model is employed to gain insight into how an inhomogeneous
cosmological model might mimic dark energy models.

10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga