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18 papers · 1 filter
Neutrino current in a gravitational plane wave collision background
Donato Bini, Christian Cherubini, Gianluca Cruciani +1
The behaviour of a massless Dirac field on a general spacetime background representing two colliding gravitational plane waves is discussed in the Newman-Penrose formalism. The geo…
The origins of Causality Violations in Force Free Simulations of Black Hole Magnetospheres
Brian Punsly, Donato Bini
Recent simulations of force-free, degenerate (ffde) black hole magnetospheres indicate that the fast mode radiated from (or near) the event horizon can modify the global potential…
Dualism between Physical Frames and Time in Quantum Gravity
Simone Mercuri, Giovanni Montani
In this work we present a discussion of the existing links between the procedures of endowing the quantum gravity with a real time and of including in the theory a physical referen…
Revised Canonical Quantum Gravity via the Frame Fixing
Simone Mercuri, Giovanni Montani
We present a new reformulation of the canonical quantum geometrodynamics, which allows to overcome the fundamental problem of the frozen formalism and, therefore, to construct an a…
Exact Cosmological Solutions of Gravitational Theories
Robert T. Jantzen
A global picture is drawn tying together most exact cosmological solutions of gravitational theories in four or more spacetime dimensions.
On stability of simplest nonsingular inflationary cosmological models within general relativity and gauge theories of gravity
G. V. Vereshchagin
In this paper we provide approximate analytical analysis of stability of nonsingular inflationary chaotic-type cosmological models. Initial conditions for nonsingular solutions at…