Search for dissertations about: "Schwinger"

Showing result 1 - 5 of 15 swedish dissertations containing the word Schwinger.

2. 1. Schwinger terms from externalfield problems

   Author : Christian Ekstrand; KTH; []
   Keywords : ;

   Abstract : .... READ MORE

4. 2. Schwinger terms in external field problems

   Author : Christian Ekstrand; KTH; []
   Keywords : ;

   Abstract : .... READ MORE

5. 3. Two-dimensional antiferromagnetism : from Schwinger bosons to spin waves

   Author : Ann Mattsson; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; honeycomb lattice; antiferromagnet; Heisenberg model;

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6. 4. Non-Perturbative Quantum Field Theory in Extreme Environments

   Author : Per Liljenberg; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; pair production; Bose-Einstein condensation; functional representation; Schwinger model; external field; boson stars; temperature; magnetisation;

   Abstract : The aim of this thesis is to describe some physical systems which can be treated by non-perturbative methods in quantum field theory. In the thesis we study systems described by quadratic Hamiltonians, possibly extended with an external electromagnetic field and/or with a thermal heat bath. READ MORE

7. 5. Some Aspects of Non-Perturbative Quantum Field Theory

   Author : Joakim Hallin; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Yang-Mills; QED; pair production; density matrix; external field; Schwinger model; gauge invariant; functional representation;

   Abstract : The aim of this thesis is to describe some different ways in which non-perturbative methods enter in quantum field theory. In the thesis such methods enter in 1+1-dimensional theories: various Yang-Mills theories and electrodynamics. It also enters when treating charged bosons or fermions interacting with an external, classical field. READ MORE