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QUANTUM FIELD THEORY

Research areas

Modern high-intensity laser systems are about to give access to fundamental physics phenomena. Complementary to particle accelerators, lasers have the potential to probe fundamental properties of nature on the microscopic quantum level. Our group explores this new potential on the theoretical basis of quantum field theory. Our goal is to identify and investigate new high-intensity phenomena and suggest concrete experimental set-ups for their verification. Research thrusts include:

  • properties of light induced by quantum or thermal fluctuations
  • quantum phenomena at highest laser intensities
  • light-induced particle production
  • light propagation in modified quantum vacua
  • optical searches for exotic particles
  • light-matter interactions out of equilibrium

Teaching fields

Prof. Gies provides advanced theory courses, supporting the training of young developing researchers during their early project phases. He gives courses in:

  • quantum field theory and quantum mechanics
  • strong-field and quantum vacuum physics

Research methods

Prof. Gies develops and applies a wide range of theoretical methods to describe quantum correlations of light and matter including:

  • perturbative effective actions and correlation functions
  • analytical and computer-algebraic field theory methods
  • numerical worldline algorithms for inhomogeneous electromagnetic fields
  • non-equilibrium quantum transport equations
  • nonperturbative renormalization flows

>> link to the Quantum Field Theory Group

>>link to DFG Research Unit FOR 2783 "Probing the Quantum Vacuum at the High-Intensity Frontier"

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