99 research outputs found
Equations of the (2,0) Theory and Knitted Fivebranes
We study non-linear corrections to the low-energy description of the (2,0)
theory. We argue for the existence of a topological correction term similar to
the C3 wedge X8(R) in M-theory. This term can be traced to a classical effect
in supergravity and to a one-loop diagram of the effective 4+1D Super
Yang-Mills. We study other terms which are related to it by supersymmetry and
discuss the requirements on the subleading correction terms from
M(atrix)-theory. We also speculate on a possible fundamental formulation of the
theory.Comment: JHEP LaTeX, 34 pages, few typos correcte
A Note On Zeroes Of Superpotentials In F-Theory
We discuss the dependence of superpotential terms in 4D F-theory on moduli
parameters. Two cases are studied: the dependence on world-filling 3-brane
positions and the dependence on 2-form VEVs. In the first case there is a zero
when the 3-brane hits the divisor responsible for the superpotential. In the
second case, which has been extensively discussed by Witten in 3D M-theory,
there is a zero for special values of 2-form VEVs when the M-theory divisor
contains non-trivial 3-cycles. We give an alternative derivation of this fact
for the special case of F-theory.Comment: 12pp Te
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