Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum fields on timelike curves   A quantum field F(x) exists at an event x of space-time in general only as a
quadratic form. Only after smearing with a smooth test function we get an
operator. In this paper the question is considered whether it is possible as
well to smear F(x) with a singular test function T (i.e. a test distribution)
supported by a smooth timelike curve. It is shown that this is always possible
if F(x) satisfies the micro local spectrum condition and T belongs to a special
class of distributions which retain some regularity in timelike directions. In
the free field case these results are used to define some kind of
time-translation along the curve which generalizes global space-time
translations of Minkowski space.

18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs