Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observational constraints on dynamical dark energy with pivoting
  redshift   We investigate the generalized Chevallier-Polarski-Linder (CPL)
parametrization, which contains the pivoting redshift $z_p$ as an extra free
parameter. We use various data combinations from cosmic microwave background
(CMB), baryon acoustic oscillations (BAO), redshift space distortion (RSD),
weak lensing (WL), joint light curve analysis (JLA), cosmic chronometers (CC),
and we include a Gaussian prior on the Hubble constant value, in order to
extract the observational constraints on various quantities. For the case of
free $z_p$ we find that for all data combinations it always remains
unconstrained, and there is a degeneracy with the current value of the dark
energy equation of state $w_0$. For the case where $z_p$ is fixed to specific
values, and for the full data combination, we find that with increasing $z_p$
the mean value of $w_0$ slowly moves into the phantom regime, however the
cosmological constant is always allowed within 1$\sigma$ confidence-level.
However, the significant effect is that with increasing $z_p$ the correlations
between $w_0$ and $w_a$ change from negative to positive, with the case $z_p
=0.35$ corresponding to no correlation. This feature indeed justifies why a
non-zero pivoting redshift should be taken into account.

33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn