A first-order noncommutative deformation of the tachyon Klein-Gordon equation yields a thermal creation spectrum with a momentum-dependent temperature below the Gibbons-Hawking value.
Tachyonic Majorana neutrinos or neutrino spin-to-orbital angular momentum conversion in OPERA
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abstract
The new data release of OPERA - CNGS experiment, obtained with a shorter spill of protons, confirms the tachyionic behavior expected from the phenomenological model of a Majorana neutrino with a fictitious imaginary mass term acquired during the propagation in the Earth's crust, recently presented by us. We performed numerical simulations of neutrino event detections to compare the properties of these Majorana tachyons with the new OPERA results, finding a good agreement. The possibility of spin-to orbital angular momentum conversion that is expected to give a negative squared mass in a medium, is also briefly discussed.
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On the scalar tachyons creation in noncommutative de Sitter space-time
A first-order noncommutative deformation of the tachyon Klein-Gordon equation yields a thermal creation spectrum with a momentum-dependent temperature below the Gibbons-Hawking value.