Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: DLCQ of M-Theory as the Light-Like Limit   We investigate whether DLCQ of M-theory can be defined as a limit of M-theory
compactified on an almost light-like circle. This is of particular interest
since the proofs of the matrix description of M-theory by Seiberg and Sen rely
on this assumption. By the standard relation between M-theory on $S^1$ and IIA
string theory, we translate this question into the corresponding one about the
existence of the light-like limit of IIA superstring theory for any string
coupling $g_s$. We argue that perturbative string loop amplitudes should have a
finite and well-defined light-like limit provided the external momenta are
chosen to correspond to a well-defined DLCQ set-up. On the non-perturbative
side we consider states and amplitudes. We show that an appropriate class of
non-perturbative states (wrapped D-branes) precisely have the right light-like
limit. We give some indications that non-perturbative corrections to string
amplitudes, too, may behave as required in the light-like limit. Having
perturbative and non-perturbative evidence, this suggests that type IIA
superstring theory as a whole has a well-defined light-like limit (for any
string coupling $g_s$) and hence that the same is true for M-theory.

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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
2
The categories of this paper are: math
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The categories of this paper are: econ
13
The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex
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The categories of this paper are: cs
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The categories of this paper are: supr-con
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The categories of this paper are: nlin
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The categories of this paper are: cmp-lg