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Spin-dependent potentials, axion-like particles and Lorentz-symmetry violation: beyond the Standard Model phenomenology at the low-energy frontier of physics

Cavalcanti Malta, Pedro

PDF, English (Doctoral thesis)
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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.

Item Type: Dissertation
Supervisor: Jäckel, Prof. Dr. Jörg
Date of thesis defense: 27 June 2017
Date Deposited: 01 Aug 2017 14:16
Date: 2017
Faculties / Institutes: The Faculty of Physics and Astronomy > Institute for Theoretical Physics
Subjects: 500 Natural sciences and mathematics
530 Physics
Uncontrolled Keywords: physics beyond the Standard Model; low-energy phenomenology; spin-dependent potentials; axion-like particles; Lorentz-symmetry violation
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