Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin foams   The spin foam framework provides a way to define the dynamics of canonical
loop quantum gravity in a spacetime covariant way, by using a path integral
over histories of quantum states which can be interpreted as `quantum
space-times'. This chapter provides a basic introduction to spin foams aimed
principally at beginning graduate students and, where possible, at broader
audiences.

31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga