15,234 research outputs found
Dark Matter Constraints in Heterotic M-Theory with Five-Brane Dominance
The phenomenological implications of the M-theory limit in which
supersymmetry is broken by the auxiliary fields of five-brane moduli is
investigated.
Assuming that the lightest neutralino provides the dark matter in the
universe, constraints on the sparticle spectrum are obtained. Direct detection
rates for dark matter are estimated.Comment: 10 pages, LaTeX file plus 8 EPS figure
Duality Symmetries in Orbifold Models
We derive the duality symmetries relevant to moduli dependent gauge coupling
constant threshold corrections, in Coxeter orbifolds. We consider
those orbifolds for which the point group leaves fixed a 2-dimensional
sublattice , of the six dimensional torus lattice , where
cannot be decomposed as Comment: 13 pages, QMW--TH--93/21, SUSX--TH--93/1
Modular Symmetries, Threshold Corrections And Moduli For Orbifolds
Coxeter orbifolds are constructed with the
property that some twisted sectors have fixed planes for which the six-torus
can not be decomposed into a direct sum with the
fixed plane lying in . The string loop threshold corrections to the
gauge coupling constants are derived, and display symmetry groups for the
and moduli that are subgroups of the full modular group . The
effective potential for duality invariant gaugino condensate in the presence of
hidden sector matter is constructed and minimized for the values of the moduli.
The effect of Wilson lines on the modular symmetries is also studied.Comment: QMW--TH--94/18, 12 page
Anisotropic Solutions For Orbifold Moduli From Duality Invariant Gaugino Condensates
The values of the and moduli are studied for those
Coxeter orbifolds with the property that some of the twisted sectors have fixed
planes for which the six-torus can not be decomposed into a direct
sum with the fixed plane lying in .
Such moduli in general transform under a subgroup of the modular group
The moduli are determined by minimizing the effective potential
derived from a duality invariant gaugino condensate.Comment: QMW--TH--94/11, SUSX--TH--94/11, 16 page
Modular Symmetries in Orbifold Compactified String Theories with Wilson lines
Target space modular symmetries relevant to string loop threshold corrections
are studied for orbifold compactified string theories containing Wilson
line background fields.Comment: SUSX--TH--93/17, QMW--TH--93/31, 12 page
Realizable Hamiltonians for Universal Adiabatic Quantum Computers
It has been established that local lattice spin Hamiltonians can be used for
universal adiabatic quantum computation. However, the 2-local model
Hamiltonians used in these proofs are general and hence do not limit the types
of interactions required between spins. To address this concern, the present
paper provides two simple model Hamiltonians that are of practical interest to
experimentalists working towards the realization of a universal adiabatic
quantum computer. The model Hamiltonians presented are the simplest known
QMA-complete 2-local Hamiltonians. The 2-local Ising model with 1-local
transverse field which has been realized using an array of technologies, is
perhaps the simplest quantum spin model but is unlikely to be universal for
adiabatic quantum computation. We demonstrate that this model can be rendered
universal and QMA-complete by adding a tunable 2-local transverse XX coupling.
We also show the universality and QMA-completeness of spin models with only
1-local Z and X fields and 2-local ZX interactions.Comment: Paper revised and extended to improve clarity; to appear in Physical
Review
Sparticle Spectrum and Dark Matter in M-Theory
The phenomenological implications of the eleven dimensional limit of
-theory (strongly coupled ) are investigated. In particular
we calculate the supersymmetric spectrum subject to constraints of correct
electroweak symmetry breaking and the requirement that the lighest
supersymmetric particle provides the dark matter of the universe. The -soft
term associated with the generation of a term in the superpotential is
calculated and its phenomenology is discussed.Comment: LaTeX file 15 pages,1 figure adde
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