Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effects of D-instantons   Scattering of fundamental states of type IIB supergravity and superstring
theory is discussed at low orders in perturbation theory in the background of a
D-instanton. The integration over fermionic zero modes in both the low energy
supergravity and in the string theory leads to explicit nonperturbative terms
in the effective action. These include a single instanton correction to the
known tree-level and one-loop $R^4$ interactions. The `spectrum' of
multiply-charged D-instantons is deduced by T-duality in nine dimensions from
multiply-wound world-lines of marginally-bound D-particles. This, and other
clues, lead to a conjectured SL(2,Z) completion of the $R^4$ terms which
suggests that they are not renormalized by perturbative corrections in the
zero-instanton sector beyond one loop. The string theory unit-charged
D-instanton gives rise to point-like effects in fixed-angle scattering, raising
unresolved issues concerning distance scales in superstring theory.

11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga