94 citations · 600 across the 40 of their papers we have counts for
31 papers · 1 filter
Condensation phenomena in gravity
Giorgio Papini
Gravity can play a role in critical phenomena. Topological singularities induce ground state degeneracy and break the continuum symmetry of the vacuum. They also generate momenta o…
Gravitational qubits
Giorgio Papini
We report on the behaviour of two-level quantum systems, or qubits, in the background of rotating and non-rotating metrics and provide a method to derive the related spin currents…
Long range order in gravity
Giorgio Papini
Gravity induced condensation takes the form of momentum alignment in an ensemble of identical particles. Use is made of a one-dimensional Ising model to calculate the alignment per…
Structured objects in quantum gravity. The external field approximation
Giorgio Papini
In the external field approximation (EFA) gravity and inertia are represented by a two-point vector that is the byproduct of symmetry breaking. The vector is accompanied by the app…
Spin and maximal acceleration
Giorgio Papini
We study the spin current tensor of a Dirac particle at accelerations close to the upper limit introduced by Caianiello. Continual interchange between particle spin and angular mom…
Classical and Quantum Aspects of Particle Propagation in External Gravitational Fields
Giorgio Papini
In the study of covariant wave equations, linear gravity manifests itself through the metric deviation and a two-point vector potential itself constructed from $γ_{μ…
Maximal acceleration and radiative processes
Giorgio Papini
We derive the radiation characteristics of an accelerated, charged particle in a model due to Caianiello in which the proper acceleration of a particle of mass has the upper li…
Perspectives on gravity-induced radiative processes in astrophysics
Giorgio Papini
Single-vertex Feynman diagrams represent the dominant contribution to physical processes, but are frequently forbidden kinematically. This is changed when the particles involved pr…
Covariance and gauge invariance in relativistic theories of gravity
Giorgio Papini
Any metric theory of gravity whose interaction with quantum particles is described by a covariant wave equation is equivalent to a vector theory that satisfies Maxwell-type equatio…
Fermion-antifermion mixing in gravitational fields
Giorgio Papini
Mixing of fermion and antifermion states occurs in gravitational interactions, leading to non-conservation of fermion number above temperatures determined by the particle masses. W…
Zitterbewegung and gravitational Berry phase
Giorgio Papini
Berry phases mix states of positive and negative energy in the propagation of fermions and bosons in external gravitational and electromagnetic fields and generate Zitterbewegung o…
Radiative processes in external gravitational fields
Giorgio Papini
Kinematically forbidden processes may be allowed in the presence of external gravitational fields. These ca be taken into account by introducing generalized particle momenta. The c…
Optics of spin-1 particles from gravity-induced phases
G. Papini, G. Scarpetta, A. Feoli +1
The Maxwell and Maxwell-de Rham equations can be solved exactly to first order in an external gravitational field. The gravitational background induces phases in the wave functions…
Spin-gravity coupling and gravity-induced quantum phases
Giorgio Papini
External gravitational fields induce phase factors in the wave functions of particles. The phases are exact to first order in the background gravitational field, are manifestly cov…
Spin-2 particles in gravitational fields
G. Papini
We give a solution of the wave equation for massless, or massive spin-2 particles propagating in a gravitational background. The solution is covariant, gauge-invariant and exact to…
Reply to Comment on ``Can gravity distinguish between Dirac and Majorana neutrinos?''
Dinesh Singh, Nader Mobed, Giorgio Papini
This is a reply to a comment (gr-qc/0610098) written by Nieves and Pal about our paper (gr-qc/0605153) published in Phys. Rev. Lett. 97, 041101 (2006).
The Distinction Between Dirac and Majorana Neutrino Wave Packets Due to Gravity and Its Impact on Neutrino Oscillations
Dinesh Singh, Nader Mobed, Giorgio Papini
We present the possibility that Dirac and Majorana neutrino wave packets can be distinguished when subject to spin-gravity interaction while propagating through vacuum described by…
Can Gravity Distinguish Between Dirac and Majorana Neutrinos?
Dinesh Singh, Nader Mobed, Giorgio Papini
We show that spin-gravity interaction can distinguish between Dirac and Majorana neutrino wave packets propagating in a Lense-Thirring background. Using time-independent perturbati…
Lower Neutrino Mass Bound from SN1987A Data and Quantum Geometry
G. Lambiase, G. Papini, R. Punzi +1
A lower bound on the light neutrino mass is derived in the framework of a geometrical interpretation of quantum mechanics. Using this model and the time of flight delay data…
Neutrino optics and oscillations in gravitational fields
G. Lambiase, G. Papini, R. Punzi +1
We study the propagation of neutrinos in gravitational fields using wave functions that are exact to first order in the metric deviation. For illustrative purposes, the geometrical…
Neutrino Wave Packet Propagation in Gravitational Fields
Dinesh Singh, Nader Mobed, Giorgio Papini
We discuss the propagation of neutrino wave packets in a Lense-Thirring space-time using a gravitational phase approach. We show that the neutrino oscillation length is altered by…
Discrete symmetries and the muon's gyro-gravitational ratio in g-2 experiments
G. Lambiase, G. Papini
We show that recent, persistent discrepancies between theory and experiment can be interpreted as corrections to the gyro-gravitational ratio of the muon and lead to improved upper…
Shadows of a maximal acceleration
G. Papini
A quantum mechanical upper limit on the value of particle accelerations, or maximal acceleration (MA), is applied to compact stars. A few MA fermions are at most present in canonic…
Radiation Bursts from Particles in the Field of Compact, Impenetrable, Astrophysical Objects
G. Papini, G. Scarpetta, V. Bozza +2
The radiation emitted by charged, scalar particles in a Schwarzschild field with maximal acceleration corrections is calculated classically and in the tree approximation of quantum…