Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmological model with dynamical curvature   The recently introduced relativistic Lagrangian darkon fluid model (EPJ C
(2015) 75:9) is generalized to a self-gravitating, irrotational, pressure-less
and stress free geodesic fluid, whose energy-momentum tensor is dust-like with
nontrivial energy flow, defining the general framework for our cosmological
model. In the present paper we consider only the averaged dynamics of the
Universe at very large scales, allowing us to work with conformal flat
geometry. The corresponding covariant propagation and constraint equations are
treated in a shear-free nonrelativistic limit. The dynamics is described with a
Lagrangian in minisuperspace. Analytic solutions for the energy density, the
Hubble function and the 1st order relativistic correction to the spatial
curvature are obtained by means of two conditional dynamical symmetries. This
leads to a cosmological model where the accelerated expansion of the Universe
is driven by a time-dependent spatial curvature without the need for
introducing any kind of dark energy. A differential equation for the area
distance is derived in addition.

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The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
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