Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A complex path around the sign problem   We review recent attempts at dealing with the sign problem in Monte Carlo
calculations by deforming the region of integration in the path integral from
real to complex fields. We discuss the theoretical foundations, the algorithmic
issues and present some results for low dimensional field theories in both
imaginary and real time.

23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex