Browsing NTNU Open by Author "Brauner, Tomas"
Now showing items 1-6 of 6
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A Soft-Limit Theorem for the On-Shell Scattering Amplitudes Describing Processes Involving Massive Nambu-Goldstone Bosons
Jakobsen, Martin Fonnum (Master thesis, 2017)In this thesis we consider systems where both Lorentz invariance and a continuous symmetry group G is explicitly broken by coupling a chemical potential µ to one of the generators Q of G. In such systems it is well known ... -
Competition of chiral soliton lattice and Abrikosov vortex lattice in QCD with isospin chemical potential
Grønli, Martin Spillum; Brauner, Tomas (Journal article; Peer reviewed, 2022)We investigate the thermodynamics of two-flavor quark matter in presence of nonzero isospin chemical potential and external magnetic field. It is known that at sufficiently high isospin chemical potential, charged pions ... -
Dimensional reduction of the Two-Higgs Doublet Model with a softly broken Z2 symmetry at one-loop
Helset, Andreas (Master thesis, 2017)In the collaboration between NTNU, the University of Stavanger, and the University of Helsinki we pursue a satisfactory answer to the problem of baryogenesis, i.e. the origin of the asymmetry in the amount of baryons and ... -
Effective Lagrangians for quantum many-body systems
Andersen, Jens Oluf; Brauner, Tomas; Hofmann, CP; Vuorinen, Aleksi (Journal article; Peer reviewed, 2014)The low-energy and low-momentum dynamics of systems with a spontaneously broken continuous symmetry is dominated by the ensuing Nambu-Goldstone bosons. It can be conveniently encoded in a model-independent effective field ... -
On-shell recursion relations for nonrelativistic effective field theories
Mojahed, Martin Aria; Brauner, Tomas (Peer reviewed; Journal article, 2021)We derive on-shell recursion relations for nonrelativistic effective field theories (EFTs) with enhanced soft limits. The recursion relations are illustrated through analytic calculation of tree-level scattering amplitudes ... -
Scattering amplitudes of massive Nambu-Goldstone bosons
Brauner, Tomas; Jakobsen, Martin Fonnum (Journal article; Peer reviewed, 2018)Massive Nambu-Goldstone (mNG) bosons are quasiparticles the gap of which is determined exactly by symmetry. They appear whenever a symmetry is broken spontaneously in the ground state of a quantum many-body system and at ...