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String-brane scattering at high energy

Monni, Cristina (2012) String-brane scattering at high energy. [Doctoral Thesis]



The main purpose of this Thesis is to provide an analysis for tree-level amplitudes involving massive string states in a D-brane background. String-brane interactions provide an ideal framework to study the dynamics of the massive states of the string spectrum in a non-trivial background. The infinite tower of massive modes in the string spectrum is essential for the perturbative finiteness of the string amplitudes. The high-energy limit of string theory is a promising regime to study the relation between string amplitudes and gravitational phenomena. We present here an analysis of tree-level amplitudes for processes in which an NS-NS string state from the leading Regge trajectory scatters from a D-brane into another state from the leading Regge trajectory, in general of a different mass, at high energies and small scattering angles. This is done by using world-sheet OPE methods and effective vertex operators.We find that this class of processes has a universal dependence on the energy of the projectile and that the tree-level amplitudes are in agreement with the eikonal operator form of the string S-matrix.

Item Type:Doctoral Thesis
Date:26 March 2012
Tutor:D'Appollonio, Giuseppe
PhD classes:Ciclo 24 > Fisica nucleare, subnucleare e astrofisica
Coordinator:Usai, Gianluca
Institution:Universita' degli Studi di Cagliari
Divisions:Dipartimenti (fino a dicembre 2011) > Dipartimento di Fisica
Subjects:Area 02 - Scienze fisiche > FIS/02 Fisica teorica, modelli e metodi matematici
Uncontrolled Keywords:String, brane, scattering, Regge trajectory
ID Code:765
Deposited On:03 Apr 2012 08:44

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