Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: World-Sheet Geometry and Baby Universes in 2-D Quantum Gravity   We show that the surface roughness for $c<1$ matter theories coupled to $2D$
quantum gravity is described by a self-similar structure of baby universes.
There exist baby universes whose neck thickness is of the order of the
ultraviolet cutoff, the largest of these having a macroscopic area $\sim A^{1
\over {1-\gamma}}$, where $A$ is the total area and $\gamma$ the string
susceptibility exponent.

36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg