Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the origin of the CDDR violation   The investigation of any violation in the Cosmic Distance Duality Relation
(CDDR) is one of the most important sources of investigation for a new physic.
In this paper we propose a new method to find the origin of a possible
violation on the CDDR. Such violation is defined from the equation
$\frac{d_L}{d_A(1+z)^2} = \eta$, with $\eta \neq 1$. We analyze the
observational constraints from SNIa, BAO and $f_{gas}$ for the parameter $\eta$
using three different parameterizations. We create three data sets with the
following combinations: (Set I) $d_L$ data from SNIa and $d_A$ data from BAO
measurements, (Set II) $d_L$ data from $f_{gas}$ and $d_A$ from BAO
measurements and (Set III) $d_L$ from SNIa and $d_A$ from $f_{gas}$
measurements. The sets have 18 points and a redshift difference between the
observational pairs of $\Delta z \leq 0.08$. It is found that the difference
between Sets I and II is up to five times higher than Sets I and III, what
suggest that a violation in the CDDR come from a new physics related with the
angular diameter distance.

14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex