[IP2I seminar] Jean-Marcel Rax: Gravity induced CP violation

vendredi 13 déc. 2024, 14:00 → 15:00 Europe/Paris

Dirac/3-Croix Rousse (IP2I)

Understanding the ultimate origin of CP violation (CPV) is of prime importance because, as suggested by Sakharov, it might explain how our matter-dominated universe emerged during its early evolution. The observed present level of CPV in neutral mesons experiments is far too small to build early universe models whose asymmetric particles production is compatible with the observed dominance of baryons over antibaryons.
The recent identification (arXiv:2405.17317  & HAL-04589721) of gravity as the source of CPV in kaons experiments renews this issue in depth. The fact that gravity is the ultimate source of CPV opens very interesting perspectives to set up asymmetric particles production models in the early universe compatible with its present state.
To demonstrate that gravity is the source of CPV we analyze the influence of earth’s gravity on neutral kaons oscillations. The main effect of a Newtonian potential is to couple the strangeness oscillation with the strange quarks zitterbewegung. This coupling is responsible for the observed CP violations. Gravity induced CP violation is in fact a CPT violation with T conservation rather than a T violation with CPT conservation, but the finite lifetime of the short-lived kaons induces a rotation of the imaginary CPT violation parameter such that it becomes real and the effect is observed as a CP and a T violation.
Both the indirect and direct violation parameters are predicted in complete agreement with the experimental data and a relativistic generalization of this Newtonian model to a Schwarzschild geometry (arXiv: 2403.07970  & HAL-04501243) confirms these results.

Seminar by Jean-Marcel Rax (Université de Paris-Saclay)
 

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Open to all IP2I & LMA members, as well as UCBL and CNRS students and collaborators. 

More information on seminars: https://intranet.ip2i.in2p3.fr/vie-scientifique/seminaires-ip2i

IP2I agenda: https://www.ip2i.in2p3.fr/agendav2/