

Document History for Document ID 522047

ID:
522047.0,
MPI für Kernphysik / Theoretical Quantum Dynamics 
Radiative corrections to electron states in intense laser fields 
Advisors:  Keitel, Christoph H.  Authors:  Meuren, Sebastian  Language:  English  Date of Approval (YYYYMMDD):  2010  Type of Thesis (e.g.Diploma):  diplom  Name of University:  RuprechtKarlsUniversität  Place of University:  Heidelberg  Physical Description (e.g. Total Number of Pages):  122 S. : Ill., graph. Darst.  Audience:  Experts Only  Abstract / Description:  In this thesis, radiative corrections to electron states in a background planewave laser field are investigated. At the tree level, electrons are described by Volkov states, which are solutions to the Dirac equation in a planewave field. However, the interaction of an electron with its own electromagnetic field leads to “radiative” modifications of the states. In the present work, the leadingorder radiatively corrected Volkov states are derived for a linearly polarized planewave field by solving the DiracSchwinger equation perturbatively. Corrections to the phase
and spinorstructure of the Volkov states are obtained to leadingorder in the finestructure constant. Both the quasimomentum of the electron and its dressed mass are shown to be altered by quantum radiative corrections. Remarkably, it is found that the dressed mass of the electron becomes in general spindependent. For the case of a constantcrossed field, a new derivation of the mass operator entering the DiracSchwinger equation is presented. Moreover, asymptotic and convergent series for the spindependent part of the dressed mass are obtained in this case. The results can be used to calculate firstorder loop corrections to elementary processes in intense laser fields.  Document Type:  Thesis 
Communicated by:  C.H. Keitel  Affiliations:  MPI für Kernphysik/ Group of C.H. Keitel
 


