Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Degenerate higher order scalar-tensor theories beyond Horndeski and
  disformal transformations   We consider all degenerate scalar-tensor theories that depend quadratically
on second order derivatives of a scalar field, which we have identified in a
previous work. These theories, whose degeneracy in general ensures the absence
of Ostrogradski instability, include the quartic Horndenski Lagrangian as well
as its quartic extension beyond Horndeski, but also other families of
Lagrangians. We study how all these theories transform under general
conformal-disformal transformations and find that they can be separated into
three main classes that are stable under these transformations. This leads to a
complete classification modulo conformal-disformal transformations. Finally, we
show that these higher order theories include mimetic gravity and some
particular khronometric theories. They also contain theories that do not
correspond, to our knowledge, to already studied theories, even up to field
redefinitions.

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The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg