Luísa Nadal / João Gabriel Violation of the T invariance in the probabilities of spin–flavor transitions of neutrino characterized by a real mixing matrix A. V. Chukhnova We study the simultaneous interaction of a neutrino with matter and the electromagnetic field in the two-flavor model. We show that -invariance violating terms can appear in the probabilities of not only spin-flip transitions but also flavor transitions between states with the same helicity in the case of the interaction via charged currents. * * * * * * Neutron Star in Quantised-space-time Bhagya. R, Diganta Parai, E. Harikumar, Suman Kumar Panja Hide abstract | Show figures | Show BibTeX | Show discussion | View PDF | 2312.00329v1 We construct and analyze a model of neutron star in the κ-deformed space-time. This is done by first deriving κ-deformed generalization of the Einstein tensor, starting from the non-commutative generalization of the metric tensor. By generalising the energy-momentum tensor to the non-commutative space-time and exploiting the κ-deformed dispersion relation, we then set up Einstein's field equations in the κ-deformed space-time. As we adopt a realisation of the non-commutative coordinates in terms of the commutative coordinates and their derivatives, our model is constructed in terms of commutative variables. Now by treating the interior of the star to be a perfect fluid as in the commutative space-time, we investigate the modification to neutron star's mass due to non-commutativity of the space-time. We show that the non-commutativity of the space-time enhances the mass limit of the neutron star. Using recent observational limit on the upper bound on the mass of neutron stars, we find the deformation parameter to be |a|~10^−44 m. Authors' comments: 17 pages