Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spherical Self-Similar Solutions in Einstein-Multi-Scalar Gravity   We consider a general non-linear sigma model coupled to Einstein gravity and
show that in spherical symmetry and for a simple realization of
self-similarity, the spacetime can be completely determined. We also examine
some more specific matter models and discuss their relation to critical
collapse.

12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex