SCOAP3 Repository 7 records found  Search took 0.02 seconds. 
1. Black Hole singularity avoidance by the Higgs scalar field / Fabbri, Luca
Einstein gravitation is known to give rise to the formation of singularities at high densities unless the dominant energy condition is made invalid by the occurrence of new physics: we show that such a new physics can be the already present Higgs sector of the standard model of particle physics..
Published in EPJC 78 (2018) 1028 10.1140/epjc/s10052-018-6505-6
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2. Covariant inertial forces for spinors / Fabbri, Luca
In this paper we consider the Dirac spinor field in interaction with a background of electrodynamics and torsion-gravity; by performing the polar reduction we acquire the possibility to introduce a new set of objects that have the geometrical status of non-vanishing tensors but which seem to contain the same information of the connection: thus they appear to be describing something that seems like an inertial force but which is also essentially covariant. [...]
Published in EPJC 78 (2018) 783 10.1140/epjc/s10052-018-6260-8
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3. Non-existence of rest-frame spin-eigenstate spinors in their own electrodynamics / Fabbri, Luca ; da Rocha, Roldão
We assume a physical situation where gravity with torsion is neglected for an electrodynamically self-interacting spinor that will be taken in its rest-frame and spin-eigenstate: we demonstrate that under this circumstance no solution exists for the system of field equations. [...]
Published in EPJC 78 (2018) 363 10.1140/epjc/s10052-018-5860-7
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4. Unveiling a spinor field classification with non-Abelian gauge symmetries / Fabbri, Luca ; da Rocha, Roldão
A spinor fields classification with non-Abelian gauge symmetries is introduced, generalizing the U(1) gauge symmetries-based Lounesto's classification. [...]
Published in Physics letters B (2018) 10.1016/j.physletb.2018.03.029
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5. Torsion axial vector and Yvon-Takabayashi angle: zitterbewegung, chirality and all that / Fabbri, Luca ; da Rocha, Roldão
We consider propagating torsion as a completion of gravitation in order to describe the dynamics of curved-twisted space-times filled with Dirac spinorial fields; we discuss interesting relationships of the torsion axial vector and the curvature tensor with the Yvon-Takabayashi angle and the module of the spinor field, that is the two degrees of freedom of the spinor field itself: in particular, we shall discuss in what way the torsion axial vector could be seen as the potential of a specific interaction of the Yvon-Takabayashi angle, and therefore as a force between the two chiral projections of the spinor field itself. [...]
Published in EPJC 78 (2018) 207 10.1140/epjc/s10052-018-5706-3
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6. Critical exact solutions for self-gravitating Dirac fields / Cianci, Roberto ; Fabbri, Luca ; Vignolo, Stefano
We consider the Einstein–Dirac field equations describing a self-gravitating massive neutrino, looking for axially symmetric exact solutions; in the search of general solutions, we find some that are specific and which have critical features, such as the fact that the space-time curvature turns out to be flat and the spinor field gives rise to a vanishing bi-linear scalar ψ¯ψ=0 with non-vanishing bi-linear pseudo-scalar iψ¯γ5ψ≠0 : because in quantum-field theory general computational methods are built on plane-wave solutions, for which the bi-linear pseudo-scalar vanishes while the bi-linear scalar does not vanish, then the solutions we found cannot be treated with the usual machinery of quantum-field theory. [...]
Published in EPJC 76 (2016) 595 10.1140/epjc/s10052-016-4428-7
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7. Exact solutions for Weyl fermions with gravity / Cianci, Roberto ; Fabbri, Luca ; Vignolo, Stefano
We consider the single-handed spinor field in interaction with its own gravitational field described by the set of field equations given by the Weyl field equations written in terms of derivatives that are covariant with respect to the gravitational connection plus Einstein field equations soured with the energy tensor of the spinor: for the Weyl spinor and the ensuing spacetime of Weyl–Lewis–Papapetrou structure, we find all exact solutions. [...]
Published in EPJC 75 (2015) 478 10.1140/epjc/s10052-015-3698-9
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