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Connections between string theory and gauge theory via scattering amplitudes

Grant number: 12/05451-8
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): September 01, 2012
Effective date (End): August 31, 2016
Field of knowledge:Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields
Principal Investigator:Horatiu Stefan Nastase
Grantee:Francisco Javier Rojas Fernandez
Home Institution: Instituto de Física Teórica (IFT). Universidade Estadual Paulista (UNESP). Campus de São Paulo. São Paulo , SP, Brazil
Associated scholarship(s):14/17363-1 - Soft theorems, scattering equations and quantum loops in AdS2, BE.EP.PD


We intend to study several relations between string theory and gauge theory from the point of view of scattering amplitudes. We have nonperturbative relations, using the AdS/CFT correspondence, perturbative (weak-weak) relations, related to amplitudes of open vs. closed strings, and perturbative information obtained from the alpha' to zero limit of string theory. The Alday-Maldacena construction revealed dual conformal symmetry and interesting structures of gluon amplitude that will be explored. The scattering of colorless objects in QCD is addressed using perturbative methods (resummation of string diagrams) and nonperturbative methods (AdS/CFT) methods. The scattering of open strings needs a regulator for tadpole cancellation conditions, a result that can shed light on the quantum Regge trajectory. The scattering of gluons in N=4 SYM and gravitons in N=8 supergravity are related, both at the tree level (KLT relations) and at the loop integrand level (the BCJ conjecture), and we will study possible extensions to N=0,1,2,4 SYM and N=4,5,6,8 supergravity and n-points. (AU)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
PUHM, ANDREA; ROJAS, FRANCISCO; UGAJIN, TOMONORI. (Non-adiabatic) string creation on nice slices in Schwarzschild black holes. Journal of High Energy Physics, n. 4 APR 27 2017. Web of Science Citations: 2.
KALOUSIOS, CHRYSOSTOMOS; ROJAS, FRANCISCO. Next to subleading soft-graviton theorem in arbitrary dimensions. Journal of High Energy Physics, n. 1 JAN 21 2015. Web of Science Citations: 57.
LOPEZ-ARCOS, CRISTHIAM; NASTASE, HORATIU; ROJAS, FRANCISCO; MURUGAN, JEFF. Conductivity in the gravity dual to massive ABJM and the membrane paradigm. Journal of High Energy Physics, n. 1 JAN 9 2014. Web of Science Citations: 1.

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