Forthcoming events in this series
14:15
The Theoretical Particle Physics seminar: The Split Supersymmetric Standard Model
16:15
12:00
Unification of couplings in string theory and implications for "realistic" string theory
16:15
13:15
GUT spectrum from Heterotic Compactification
(Seminar will take place in King's College London, room 423)
12:00
D-branes in Landau Ginzburg models
I will discuss the Landau-Ginzburg description of B-type
D-branes. The main example w
12:00
12:00
12:00
12:00
Special holonomy, killing spinors and singularity resolution from wrapped D-branes
12:00
On Witten's Perturbative Gauge Theory as a string Theory in Twistor Space II
12:00
12:00
On Witten's Perturbative gauge theory as a string theory in twistor space
(Joint String/Relativity Seminar)
12:00
Symmetries of M-theory
(Dennis Sciama Lecture Theatre)
Abstract
After a review of the symmetries of supergravity theories and Kac-Moody
algebras, we explain show that M theory is likely to possess a very large
Kac-Moody symmetry of rank eleven, denoted by E_{11}. We also provide
evidence that even pure gravity and the closed bosonic string possess
analogous Kac-Moody symmetries.
Finally, we explain how the central charges of the maximal supergravity
theories arise naturally in E_{11}.
12:00
Special Holonomy Manifolds and Quartic String Corrections
Abstract
At the leading order, the low-energy effective field equations in string
theory admit solutions of the form of products of Minkowski spacetime and a
Ricci-flat Calabi-Yau space. The equations of motion receive corrections at
higher orders in \alpha', which imply that the Ricci-flat Calabi-Yau space is
modified. In an appropriate choice of scheme, the Calabi-Yau space remains
Kahler, but is no longer Ricci-flat. We discuss the nature of these
corrections at order {\alpha'}^3, and consider the deformations of all the
known cohomogeneity one non-compact Kahler metrics in six and eight
dimensions. We do this by deriving the first-order equations associated with
the modified Killing-spinor conditions, and we thereby obtain the modified
supersymmetric solutions. We also give a detailed discussion of the boundary
terms for the Euler complex in six and eight dimensions, and apply the
results to all the cohomogeneity one examples. Additional material will be
presented concerning the case of holonomy G_2.
12:00
Moduli Kahler Potential for M-theory on a G_2 Manifold
Abstract
I present a calculation of the moduli Kahler potential for M-theory
on a G_2 manifold in a large radius approximation. The result is used to
analyze moduli dynamics and moduli stabilization in the context of the
associated four-dimensional effective theory.