Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An effective quantum mechanism for mass generation in
  diffeomorphism-invariant theories   We propose a scenario for particle-mass generation, assuming the existence of
a physical regime where, firstly, physical particles can be considered as
point-like objects moving in a background space-time and, secondly, their mere
presence spoils the invariance under the local diffeomorphism group, resulting
in an anomalous realization of the latter. Under these hypotheses, we describe
mass generation starting from the massless free theory. The mechanism is not
sensitive to the detailed description of the underlying theory at higher
energies, leaning only on general structural features of it, specifically
diffeomorphism invariance.

34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat