Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The fifth dimension in the worldline formalism, holography, and the
  Wilson flow   We develop a model for hadrons in the framework of the worldline formalism.
While being based wholly in four-dimensional quantum field theory, it shares
many features with holographic approaches: Already by the use of the worldline
formalism the approach appears intrinsically quantum mechanical. As auxiliary
fifth dimension Schwinger's proper time is grouped with the physical four
spacetime dimensions into an AdS5 geometry, which is warped due to
conformal-symmetry breaking effects. Hidden local symmetry is emergent. The
four-dimensional sources are extended to five-dimensional fields by a Wilson
flow (gradient flow). A variational principle for the flow reproduces exactly
the corresponding holographic computation. The worldline approach also yields
the higher-dimensional description in the non-relativistic case.

28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th