@misc{erikoistyo,
    author    = "Joonas Ilmavirta",
    title     = "One loop neutrino self energies in coherent quasiparticle approximation",
    school    = "University of Jyv\"askyl\"a, Department of Physics",
    year      = "2011",
    month     = sep,
    note = "research training report",
    url = {http://users.jyu.fi/~jojapeil/thesis/one_loop_neutrino_self_energies_in_cqpa_121211.pdf},
    abstract = {In this research training report we calculate leading order corrections to neutrino self energies in coherent quasiparticle approximation (cQPA). These corrections are needed for a treatment of neutrino oscillation in matter in finite temperature; such a treatment in cQPA will take coherence into account more carefully than the standard approach.

We first briefly review cQPA, and to this end will briefly discuss the role of coherence in quantum mechanics and the different formulations and phenomena of thermal field theory. Using the Feynman rules for evaluating self energy corrections in cQPA, we identify the relevant diagrams and calculate the corrections.

Finally we discuss the corrections and compare them to the standard approach to neutrino oscillations in matter, which does not similarly take into account nonlocal coherence and the fermionic nature of neutrinos. Application of the obtained results to neutrino oscillations are unfortunately beyond the scope of this work, and will hopefully be discussed in a further study.}
}