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38 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…
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…
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…