A square-torsion modification of Einstein-Cartan theory

In the present paper we consider a theory of gravity in which not only curvature but also torsion is explicitly present in the Lagrangian, both with their own coupling constant. In particular, we discuss the couplings to Dirac fields and spin fluids: in the case of Dirac fields, we discuss how in our approach, the Dirac self-interactions depend on the coupling constant as a parameter that may even make these non-linearities manifest at subatomic scales, showing different applications according to the value of the parameter we have assigned; in the case of spin fluids, we discuss FLRW cosmological models arising from the proposed theory.Comment: 21 page

On geometric relativistic foundations of matter field equations and plane wave solutions

In this paper, we start from the geometric relativistic foundations to define the basis upon which matter field theories are built, and their wave solutions are investigated, finding that they display repulsive interactions able to reproduce the exclusion principle in terms of its effects in a dynamical way, then discussing possible consequences and problems.Comment: 11 page

A torsional completion of gravity for Dirac matter fields and its applications to neutrino oscillations

In this paper, we consider the torsional completion of gravitation for an underlying background filled with Dirac fields, applying it to the problem of neutrino oscillations: we discuss the effects of the induced torsional interactions as corrections to the neutrino oscillation mechanism.Comment: 4 page

Black (or) Italians? The Construction of Blackness in Italian Context - Past and Present

Black (or) Italians? The Construction of Blackness in the Italian Context – Past and Present. In the last 30 years Italy experienced relevant changes due to its new configuration as a postcolonial country and land of transnational migrations, without ceasing to be an emigration country. From the official end of Italian colonialism and, later, from the Berlin Wall fell, the seas around Italy no longer constitute insuperable barriers but rather borders that are continously crossed. The arrival, the transition or the stable settlement of people coming from the Global South, the daily deaths in the Mediterranean Sea, the increasing presence of the so-called “second generations of migration” and the consequent social and demographic changes force Italy to deal with its postcolonial and, as Cristina Lombardi-Diop proposed, postracial status. The new social balances created by migration flows and the increasingly presence of Afroitalians have two simultaneous effects: on one hand they are re-defining the concepts of “being Italian” and of national belonging; on the other hand they are revealing that the racial identity of the Italians has been built up as uniformly white, with the consequent foreclosure of people who are not included in this “chromatic norm”. In this paper I focus on the construction processes of blackness in the frame of Italian historical and geopolitical context. Connecting the postcolonial present with the colonial past, I examine how the definition of the concept of blackness has been influenced by specific social phenomena linked to specific historical periods (as colonialism, migrations etc). I analyze both the representations of blackness in today’s Italy and how the common idea that “black Italian” is an oxymoron is increasingly challenged by the “second generations”

Polar solutions with tensorial connection of the spinor equation

Dirac field equations are studied for spinor fields without any external interaction and when they are considered on a background having a tensorial connection with a specific non-vanishing structure some solution can be found in polar form displaying a square-integrable localized behaviour.Comment: 6 page