title: Spin-dependent potentials, axion-like particles and Lorentz-symmetry violation:  beyond the Standard Model phenomenology at the low-energy frontier of physics
creator: Cavalcanti Malta, Pedro
subject: ddc-500
subject: 500 Natural sciences and mathematics
subject: ddc-530
subject: 530 Physics
description: It is well known that the Standard Model is not complete and many of the theories that seek to extend it predict new phenomena that may be accessible in low-energy settings. This thesis deals with some of these, namely, novel spin-dependent interparticle potentials, axion-like particles and Lorentz-symmetry violation. In Part I we discuss the spin-dependent potentials that arise due to the exchange of a  topologically massive mediator, and also pursue a comparative study between spin-1/2 and spin-1 sources. In Part II we treat massive axion-like particles that may be  copiously produced in core-collapse supernovae, thus leading to a non-standard flux of gamma rays. Using SN 1987A and the fact that after its observation no extra gamma-ray signal was detected, we are able to set robust limits on the parameter space of axion-like particles with masses in the 10 keV - 100MeV range. Finally, in Part III we investigate the effects of Lorentz-breaking backgrounds in QED. We  discuss two scenarios: a modification in the Maxwell sector via the Carroll-Field-Jackiw term and a new non-minimal coupling between electrons and photons. We are able to set upper limits on the coefficients of the backgrounds by using laboratory-based measurements.
date: 2017
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/23260/1/PhD_PC_Malta.pdf
identifier: DOI:10.11588/heidok.00023260
identifier: urn:nbn:de:bsz:16-heidok-232604
identifier:   Cavalcanti Malta, Pedro  (2017) Spin-dependent potentials, axion-like particles and Lorentz-symmetry violation: beyond the Standard Model phenomenology at the low-energy frontier of physics.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/23260/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng