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Loriano Bonora (TS)06/05/2019, 10:00
The talk tries to address the question: how to construct a local field
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theory with infinite many fields. First the effective action method is
presented. It is shown how it naturally leads to the definition of
(generally non-local) field theories. It has however strong technical
limitations. Then the more powerful and systematic worldline approach is
introduced, which carries the... -
Toshiko Kojita06/05/2019, 11:00
We examined in the previous paper whether winding number could be defined
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in CSFT. We have found that the quantity N=\int (UQU^-1)^3 has many desirable properties as topological quantity. However, N could not realize an arbitrary integer
value, since it is not possible to suppress the anomaly.
This time, by generalizing the KBc-type solution, we were able to obtain N with arbitorary integer... -
Martin Schnabl06/05/2019, 12:00
We review some of the older as well as more recent progress in attempts to construct and study classical solutions in string field theory.
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Jakub Vosmera06/05/2019, 14:30
We show that apart from the conventional Dp-branes and their supersymmetric bound states, the weakly coupled type II superstring compactified on a 4-torus admits new stable non-BPS fundamental D-branes. We construct the corresponding elementary superconformal boundary states at special values of closed string moduli for which the worldsheet theory admits a Gepner-like description and check a...
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Pierre Vanhove06/05/2019, 15:05
Closed string theory amplitudes display the remarkable property of presenting only single-valued multiple zeta in its low-energy expansion. At genus zero we show how this emerges by identifying the building blocks of any closed string amplitudes with the value at z=1 of single-valued correlation functions in two dimensional conformal field theory. We use the single-valuedness condition to...
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Franco Pezzella06/05/2019, 16:30
After discussing some proposals for a string world-sheet manifestly invariant under the $O(D,D)$ Abelian T-duality, the more general notion of Poisson-Lie T-duality will be introduced together with the one of Drinfeld double that constitutes the algebraic structure necessary to the existence of such duality. As illustrating examples, the three-dimensional Isotropic Rigid Rotor and the...
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Hirosi Ooguri07/05/2019, 10:00
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Faroogh Moosavian07/05/2019, 11:00
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Yongbin Ruan07/05/2019, 12:00
One of biggest and most difficult problems in the subject of Gromov-Witten
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theory is to compute higher genus Gromov-Witten theory of compact Calabi-Yau 3-fold.
There have been a collection of remarkable conjecture from physics for so called 14 one-parameter models,
simplest compact Calabi-Yau 3-folds similar to the quintic 3-folds. These conjectures were
originated from universal properties... -
Matej Kudrna07/05/2019, 14:30
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Theodore Erler07/05/2019, 15:05
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Pietro Antonio Grassi07/05/2019, 16:30
Inspired by the analogy between different types of differential forms
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on supermanifolds and string fields in superstring theory,
I describe new multilinear non-associative products of forms
which yield an A-infinity algebra for any supermanifold. -
Yuji Okawa08/05/2019, 10:00
In open bosonic string field theory with the cubic interaction in terms of the star product a gauge-invariant operator can be defined for each on-shell closed string state. In the theory on N coincident D-branes we claim that the evaluation of correlation functions of the gauge-invariant operators in the 1/N expansion can be interpreted as a closed string perturbation theory in a low-energy...
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Rennan Lipinski Jusinskas08/05/2019, 11:00
Previous attempts to determine the worldsheet origin of the pure spinor formalism were not completely successful, but introduced important concepts that seem to be connected to its fundamental structure. I will present here a new proposal for the underlying gauge theory of the pure spinor superstring, based on an extension of Berkovits' twistor-like constraint. I will start with a quick review...
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Oliver Schlotterer08/05/2019, 12:00
This talk is dedicated to one-loop amplitudes in open, closed and heterotic string theories
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and aims to illustrate connections between their low-energy expansions. For open strings,
the coefficients in the one-loop alpha’-expansion are elliptic multiple zeta values which arise
from moduli-space integrals over punctured cylinders. Closed and heterotic strings in turn
introduce moduli-space... -
Sebastian Mizera08/05/2019, 14:30
It has long been known that intersection theory on the moduli space of punctured Riemann surfaces computes all observables in the two-dimensional quantum gravity. It is natural to ask whether interacting theories could also admit a similar description. In the genus-zero case we construct a twisted version of intersection theory on the moduli space and propose that it gives rise to tree-level...
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Tomasz Taylor08/05/2019, 15:05
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Igor Pesando08/05/2019, 16:30
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Ashoke Sen09/05/2019, 10:00
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Hiroaki Matsunaga09/05/2019, 11:00
We extract a light-cone string field theory from Witten’s covariant string field theory.
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The covariant string field splits into the light-cone string field and trivial excitations of BRST quartets:
The latter generates the gauge symmetry and covariance.
A new light-cone theory, which has an A-infinity type action, is obtained by path-integrating it out from the Witten theory.
We show that... -
Michael Kroyter09/05/2019, 12:00
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Toru Masuda09/05/2019, 14:30
We present a series of new gauge invariant quantities in Witten's open string field theory. They are defined against a set of open-string states which satisfy the physical state condition around a classical solution. We discuss that, for known classical solutions, these gauge invariant quantities compute the on-shell tree-level scattering amplitudes on a D-brane configuration represented by...
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Tomohiko Takahashi09/05/2019, 15:05
We revisit the identity-based solutions for tachyon condensation in
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open bosonic string field theory (SFT) from the viewpoint of the
sine-square deformation (SSD). We show that the open string system with
SSD exhibits decoupling of the left and right moving modes and so it
behaves like a system with a periodic boundary condition. With a method
developed by Ishibashi and Tada, we construct... -
Ivo Sachs09/05/2019, 16:30
I will discuss the marginal deformation describing the blow-up of a zero-size D-brane within super string field theory as well as the world sheet description. By analyzing the equations of motion of superstring field theory we find that this marginal deformation is obstructed, at third order in the size of the D- brane. This obstruction is due to subtleties in the integration over odd moduli...
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Hiroshi Kunitomo10/05/2019, 10:00
We construct a complete heterotic string field theory that includes
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both the Neveu-Schwarz and Ramond sectors. We give a construction
of general string products, which realizes a cyclic L-infinity structures
and thus provides with a gauge invariant action in the homotopy
algebraic formulation. Through a map of the string fields, we also
give the Wess-Zumino-Witten-like action in the large... -
Harold Erbin10/05/2019, 11:00
We prove crossing symmetry of superstring amplitudes to all orders in
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perturbation theory. This is achieved by showing that the Green
functions are analytic in a specific region of the complex momentum
space ("primitive domain") and making use of results from Bros, Epstein
and Glaser. The original derivation relies on locality and causality of
the underlying QFT in position space: since this... -
Dimitri Skliros10/05/2019, 12:00
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10/05/2019, 12:30
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