TY  - GEN
Y1  - 2017///
TI  - Spin-dependent potentials, axion-like particles and Lorentz-symmetry violation:
beyond the Standard Model phenomenology at the low-energy frontier of physics
AV  - public
KW  - physics beyond the Standard Model; low-energy phenomenology;
spin-dependent potentials; axion-like particles; Lorentz-symmetry violation
ID  - heidok23260
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/23260/
A1  - Cavalcanti Malta, Pedro
N2  - 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.
ER  -