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27 papers · 2 filters
The black hole dynamical horizon and generalized second law of thermodynamics
Song He, Hongbao Zhang
The generalized second law of thermodynamics for a system containing a black hole dynamical horizon is proposed in a covariant way. Its validity is also tested in case of adiabatic…
Fundamental parameter-free solutions in Modified Gravity
J. W. Moffat, V. T. Toth
Modified Gravity (MOG) has been used successfully to explain the rotation curves of galaxies, the motion of galaxy clusters, the Bullet Cluster, and cosmological observations witho…
Volumes of Space as Subsystems
Federico Piazza, Fabio Costa
As a novel approach with possible relevance to semiclassical gravity, we propose to define regions of space as quantum subsystems. After recalling how to divide a generic quantum s…
Physical boundary state for the quantum tetrahedron
Etera R. Livine, Simone Speziale
We consider stability under evolution as a criterion to select a physical boundary state for the spinfoam formalism. As an example, we apply it to the simplest spinfoam defined by…
N=2 supersymmetric spin foams in three dimensions
Etera R. Livine, James P. Ryan
We construct the spin foam model for N=2 supergravity in three dimensions. Classically, it is a BF theory with gauge algebra osp(2|2). This algebra has representations which are no…
Is the cosmological "constant" a nonlocal quantum residue of discreteness of the causal set type?
Rafael D. Sorkin
The evidence for an accelerating Hubble expansion appears to have confirmed the heuristic prediction, from causal set theory, of a fluctuating and ``ever-present'' cosmological ter…