Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observables in effective gravity   We address the construction and interpretation of diffeomorphism-invariant
observables in a low-energy effective theory of quantum gravity. The
observables we consider are constructed as integrals over the space of
coordinates, in analogy to the construction of gauge-invariant observables in
Yang-Mills theory via traces. As such, they are explicitly non-local.
Nevertheless we describe how, in suitable quantum states and in a suitable
limit, the familiar physics of local quantum field theory can be recovered from
appropriate such observables, which we term `pseudo-local.' We consider
measurement of pseudo-local observables, and describe how such measurements are
limited by both quantum effects and gravitational interactions. These
limitations support suggestions that theories of quantum gravity associated
with finite regions of spacetime contain far fewer degrees of freedom than do
local field theories.

31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat