Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Maximal Acceleration, Reciprocity & Nonlocality   The existence of a fundamental scale is expected to be a key feature of
quantum gravity. Many approaches take this property as a starting assumption.
Here, instead, we take a less conventional viewpoint based on a critical
inspection of both fundamental principles and kinematic laws. We point out that
rigorous arguments suggest a more urgent need to revise known theories to
incorporate a fundamental acceleration scale already in flat space. The
reciprocity principle can naturally do so. In addition to noticing links with
string theory, we argue that the reciprocity principle implies an
infinite-derivative generalization of the Einstein-Hilbert action that makes
the gravitational interaction fundamentally nonlocal, thus providing a guiding
principle that could lead us towards the formulation of a consistent theory of
quantum gravity.

14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom