COOKIES: By using this website you agree that we can place Google Analytics Cookies on your device for performance monitoring. |

University of Cambridge > Talks.cam > Isaac Newton Institute Seminar Series > Motivic Superstring Amplitudes

## Motivic Superstring AmplitudesAdd to your list(s) Download to your calendar using vCal - Stieberger, S (Max-Planck-Institut fr Physik, Mnchen)
- Thursday 11 April 2013, 11:00-12:00
- Seminar Room 1, Newton Institute.
If you have a question about this talk, please contact Mustapha Amrani. Grothendieck-Teichmller Groups, Deformation and Operads We review the recent advances in open superstring N-point tree-level computations. One basic ingredient is a basis of (N-3)! generalized Gaussian hypergeometric functions (generalized Euler integrals) encoding all string effects through their dependence on the string tension $lpha’$. The structure of the open superstring amplitudes is analyzed. We find a striking and elegant form, which allows to disentangle its $lpha’$ power series expansion into several contributions accounting for different classes of multiple zeta values. This form is bolstered by the decomposition of motivic multiple zeta values, i.e. the latter encapsulate the $lpha’$-expansion of the superstring amplitude. Moreover, a morphism induced by the coproduct maps the $lpha’$-expansion onto a non-commutative Hopf algebra. This map represents a generalization of the symbol of a transcendental function. In terms of elements of this Hopf algebra the alpha’-expansion assumes a very simple and symmetric form, which carries all the relevant information. This talk is part of the Isaac Newton Institute Seminar Series series. ## This talk is included in these lists:- All CMS events
- Featured lists
- INI info aggregator
- Isaac Newton Institute Seminar Series
- School of Physical Sciences
- Seminar Room 1, Newton Institute
- bld31
Note that ex-directory lists are not shown. |
## Other listsPragmatics Reading Group Darwin College Science Seminars Empowered Voices Year King's Graduate Seminar One Day Meeting - Third Annual Symposium of the Cambridge Computational Biology Institute Open Cambridge## Other talksBlack and British Migration Improving on Nature: Biotechnology and the Ethics of Animal Enhancement Group covariance functions for Gaussian process metamodels with categorical inputs Quantum geometry from the quantisation of gravitational boundary modes on a null surface Kiwi Scientific Acceleration on FPGA Challenges to monetary policy in a global context Sustainability of livestock production: water, welfare and woodland Crowding and the disruptive effect of clutter throughout the visual system 'Cryptocurrency and BLOCKCHAIN – PAST, PRESENT AND FUTURE' Inferring the Evolutionary History of Cancers: Statistical Methods and Applications On the climate change conversation |