Apostolos Pilaftsis

Mar 5, 2024 | link.aps.org | Dimitrios Karamitros |Thomas McKelvey |Apostolos Pilaftsis

We analyze in detail the effect of varying entropy degrees of freedom on low-scale leptogenesis models. As an archetypal model, we consider the triresonant leptogensis (TRL) scenario introduced recently by the authors, where the neutrino-Yukawa coupling matrix is dictated by an approximate Zn discrete symmetry (with n=3, 6).

Jul 13, 2023 | link.aps.org | Dimitrios Karamitros |Thomas McKelvey |Apostolos Pilaftsis

Abstract We study in detail the dynamics of unstable two-level quantum systems by adopting the Bloch-sphere formalism of qubits. By employing the Bloch-vector representation for such unstable qubit systems, we identify a novel class of critical scenarios in which the so-called energy-level and decay-width vectors, E and Γ, are orthogonal to one another, and the parameter r=|Γ|/(2|E|) is less than 1.