Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Resolving modular flow: a toolkit for free fermions   Modular flow is a symmetry of the algebra of observables associated to
spacetime regions. Being closely related to entanglement, it has played a key
role in recent connections between information theory, QFT and gravity.
However, little is known about its action beyond highly symmetric cases. The
key idea of this work is to introduce a new formula for modular flows for free
chiral fermions in $1+1$ dimensions, working directly from the
\textit{resolvent}, a standard technique in complex analysis. We present novel
results -- not fixed by conformal symmetry -- for disjoint regions on the
plane, cylinder and torus. Depending on temperature and boundary conditions,
these display different behaviour ranging from purely local to non-local in
relation to the mixing of operators at spacelike separation. We find the
modular two-point function, whose analytic structure is in precise agreement
with the KMS condition that governs modular evolution. Our ready-to-use
formulae may provide new ingredients to explore the connection between
spacetime and entanglement.

36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an