Triangle Seminars
Monday, 9 Mar 2009
QUANTUM THEORY IN SIX DIMENSIONS
Mans Henningson
(Chalmers, Goteborg)
Abstract:
We first quickly review some basic facts about quantum theories in 1+5 dimensions with 2,0 superconformal symmetry. They arise as decoupled subsectors of string or M theories on space times containing certain defects like branes or singularities. By compactification,
they are also related to Yang-Mills theories in lower dimensions. We then describe, in somewhat more detail, recent work on these theories considered on a spatial five torus. In particular, one may determine the
spectrum of vacuum states, and also learn much about the spectrum of
BPS states. Hopefully, this will eventually be helpful for giving a definition of
these mysterious theories.
We first quickly review some basic facts about quantum theories in 1+5 dimensions with 2,0 superconformal symmetry. They arise as decoupled subsectors of string or M theories on space times containing certain defects like branes or singularities. By compactification,
they are also related to Yang-Mills theories in lower dimensions. We then describe, in somewhat more detail, recent work on these theories considered on a spatial five torus. In particular, one may determine the
spectrum of vacuum states, and also learn much about the spectrum of
BPS states. Hopefully, this will eventually be helpful for giving a definition of
these mysterious theories.
Posted by: IC
Tuesday, 10 Mar 2009
Three recent results on asymptotics of oscillations
Sir Michael Berry
(Physics Department, University of Bristol)
Abstract:
The results are separate, and apparently paradoxical, and have implications for physics. First, when two exponentials compete, their interference can be dominated by the contribution with smaller exponent. Second, repeated differentiation of almost all functions in a wide class generates trigonometric oscillations ('almost all functions tend to cosx'). Third, it is possible to find band-limited functions that oscillate arbitrarily faster than their fastest Fourier component ('superoscillations').
The results are separate, and apparently paradoxical, and have implications for physics. First, when two exponentials compete, their interference can be dominated by the contribution with smaller exponent. Second, repeated differentiation of almost all functions in a wide class generates trigonometric oscillations ('almost all functions tend to cosx'). Third, it is possible to find band-limited functions that oscillate arbitrarily faster than their fastest Fourier component ('superoscillations').
Posted by: KCL
Statistics of eigenfunctions in open chaotic systems: a perturbative approach
Charles Poli
(LPMC Nice)
Wednesday, 11 Mar 2009
On reduced model for strings in AdS5 x S5
📍 London
Arkady Tseytlin
(Imperial College)
Integrability for the Full Spectrum of Planar AdS/CFT
Nikolai Gromov
(DESY)
Abstract:
We review a duality between N=4 super Yang-Mills and
a string theory in AdS5xS5 background and integrability
arising in both theories. New results conserning
finite length operators/short strings will be presented.
We review a duality between N=4 super Yang-Mills and
a string theory in AdS5xS5 background and integrability
arising in both theories. New results conserning
finite length operators/short strings will be presented.
Posted by: IC
Thursday, 12 Mar 2009
Open string wavefunctions in warped compactifications
Fernando Marchesano
(CERN)
Abstract:
I will discuss the wavefunctions for open strings in warped compactifications, and in particular for D7-branes in warped Calabi-Yau orientifolds, which provide a string theory realizations of the Randall-Sundrum scenario. I will show how certain background fluxes, necessary in the presence of warping, couple to the fermionic wavefunctions and qualitatively change their behavior. Finally, the warped Kahler potential for the D7-brane light modes will be discussed, as well as a proposal to embed it in the full open+closed Kahler potential.
I will discuss the wavefunctions for open strings in warped compactifications, and in particular for D7-branes in warped Calabi-Yau orientifolds, which provide a string theory realizations of the Randall-Sundrum scenario. I will show how certain background fluxes, necessary in the presence of warping, couple to the fermionic wavefunctions and qualitatively change their behavior. Finally, the warped Kahler potential for the D7-brane light modes will be discussed, as well as a proposal to embed it in the full open+closed Kahler potential.
Posted by: QMW
Lattice Sine-Gordon Model: Explicit Construction of Separation of Variable Basis
Giuliano Niccoli
(DESY Hamburg)
Abstract:
tba
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Posted by: KCL
Friday, 13 Mar 2009
Some aspects of flux compactifications.
Michela Petrini
(Jussieu Paris)
Abstract:
This is the first lecture of a short course on flux compactifications. For more information on the course and the schedule, please visit
http://www.strings.ph.qmw.ac.uk/index.htm
and follow the link to the Graduate Program in String/Field Theory.
This is the first lecture of a short course on flux compactifications. For more information on the course and the schedule, please visit
http://www.strings.ph.qmw.ac.uk/index.htm
and follow the link to the Graduate Program in String/Field Theory.
Posted by: QMW