Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generalized framework for testing gravity with gravitational-wave
  propagation. II. Constraints on Horndeski theory   Gravitational waves (GW) are generally affected by modification of a gravity
theory during propagation in cosmological distance. We numerically perform a
quantitative analysis on Horndeski theory at cosmological scale to constrain
the Horndeski theory by GW observations in model-independent way. We formulate
a parameterization for a numerical simulation based on the Monte Carlo method
and obtain the classification of the models that agrees with cosmic
accelerating expansion within observational errors of the Hubble parameter. As
a result, we find that a large group of the models in the Horndeski theory that
mimic cosmic expansion of ${\Lambda}$CDM model can be excluded from the
simultaneous detection of a GW and its electromagnetic transient counterpart.
Based on our result and the latest detection of GW170817 and GRB170817A, we
conclude that the subclass of Horndeski theory including arbitrary functions
$G_4$ and $G_5$ can hardly explain cosmic accelerating expansion without
fine-tuning.

25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph