Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-unitarity of Minkowskian non-local quantum field theories   We show that Minkowskian non-local quantum field theories are not unitary. We
consider a simple one loop diagram for a scalar non-local field and show that
the imaginary part of the corresponding complex amplitude is not given by
Cutkosky rules, indeed this diagram violates the unitarity condition. We
compare this result with the case of an Euclidean non-local scalar field, that
has been shown to satisfy the Cutkosky rules, and we clearly identify the
reason of the breaking of unitarity of the Minkowskian theory.

30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg