Abstract
I discuss various ways in which CPT symmetry may be violated, and their phenomenology in current or immediate future experimental facilities, both terrestrial and astrophysical. Specifically, I discuss first violations of CPT symmetry due to the impossibility of defining a scattering matrix as a consequence of the existence of microscopic or macroscopic space-time boundaries, such as Planck-scale Black-Hole (event) horizons, or cosmological horizons due to the presence of a (positive) cosmological constant in the Universe. Second, I discuss CPT violation due to breaking of Lorentz symmetry, which may characterize certain approaches to quantum gravity, and third, I describe models of CPT non invariance due to violations of locality of interactions. In each of the above categories I discuss experimental sensitivities. I argue that the majority of Lorentz-violating cases of CPT breaking, with minimal (linear) suppression by the Planck-mass scale, are already excluded by current experimental tests. There are however some (stringy) models which can evade these constraints.
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Mavromatos, N.E. (2004). On CPT Symmetry: Cosmological, Quantum-Gravitational and Other Possible Violations and Their Phenomenology. In: Klapdor-Kleingrothaus, H.V. (eds) Beyond the Desert 2003. Springer Proceedings in Physics, vol 92. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-18534-2_3
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DOI: https://doi.org/10.1007/978-3-642-18534-2_3
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