52,880 research outputs found
Effective potential and warp factor dynamics
We define an effective potential describing all massless and massive modes in
the supergravity limit of string/M theory compactification which is valid
off-shell, i.e. without imposing the equations of motion. If we neglect the
warp factor, it is unbounded below, as is the case for the action in Euclidean
quantum gravity. By study of the constraint which determines the warp factor,
we solve this problem, obtaining a physically satisfying and tractable
description of the dynamics of the warp factor.Comment: 32 pages, JHEP3.cls. v4: added reference to hep-th/050715
Basic results in Vacuum Statistics
A review of recent work on constructing and finding statistics of string
theory vacua, done in collaboration with Frederik Denef, Bogdan Florea, Bernard
Shiffman and Steve Zelditch.Comment: 11 pages, 5 figures (Latex elsart.cls, included
Enhanced Gauge Symmetry in M(atrix) Theory
We discuss the origin of enhanced gauge symmetry in ALE (and K3)
compactification of M theory, either defined as the strong coupling limit of
the type IIa superstring, or as defined by Banks et al. In the D-brane
formalism, wrapped membranes are D0 branes with twisted string boundary
conditions, and appear on the same footing with the Kaluza-Klein excitations of
the gauge bosons. In M(atrix) theory, the construction appears to work for
arbitrary ALE metric.Comment: 10 pp, harvma
A Brief Retrospective Look at the Cayley-Purser Public-key Cryptosystem, 19 Years Later
The purpose of this paper is to describe and analyze the Cayley-Purser
algorithm, which is a public-key cryptosystem proposed by Flannery in 1999. I
will present two attacks on it, one of which is apparently new. I will also
examine a variant of the Cayley-Purser algorithm that was patented by Slavin in
2008, and show that it is also insecure.Comment: submitted for publicatio
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