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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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11 papers · 2 filters
Non-singular black holes and the Limiting Curvature Mechanism: A Hamiltonian perspective
Jibril Ben Achour, Frederic Lamy, Hongguang Liu +1
We revisit the non-singular black hole solution in (extended) mimetic gravity with a limiting curvature from a Hamiltonian point of view. We introduce a parameterization of the pha…
Dark energy from quantum gravity discreteness
Alejandro Perez, Daniel Sudarsky
We argue that discreteness at the Planck scale (naturally expected to arise from quantum gravity) might manifest in the form of minute violations of energy-momentum conservation of…
Quantum reduced loop gravity effective Hamiltonians from a statistical regularization scheme
Emanuele Alesci, Gioele Botta, Gabriele V. Stagno
We introduce a new regularization scheme for Quantum Cosmology in Loop Quantum Gravity (LQG) using the tools of Quantum Reduced Loop Gravity (QRLG). It is obtained considering dens…
Memory Effect for Impulsive Gravitational Waves
P. -M. Zhang, C. Duval, P. A. Horvathy
Impulsive gravitational plane waves, which have a delta-function singularity on a hypersurface, can be obtained by squeezing smooth plane gravitational waves with Gaussian profile.…
SU(2) graph invariants, Regge actions and polytopes
Pietro Donà, Marco Fanizza, Giorgio Sarno +1
We revisit the the large spin asymptotics of 15j symbols in terms of cosines of the 4d Euclidean Regge action, as derived by Barrett and collaborators using a saddle point approxim…
Sachs' free data in real connection variables
Elena De Paoli, Simone Speziale
We discuss the Hamiltonian dynamics of general relativity with real connection variables on a null foliation, and use the Newman-Penrose formalism to shed light on the geometric me…
Light Cone Thermodynamics
Tommaso De Lorenzo, Alejandro Perez
We show that null surfaces defined by the outgoing and infalling wave fronts emanating from and arriving at a sphere in Minkowski spacetime have thermodynamical properties that are…
Born-Infeld inspired modifications of gravity
Jose Beltran Jimenez, Lavinia Heisenberg, Gonzalo J. Olmo +1
General Relativity has shown an outstanding observational success in the scales where it has been directly tested. However, modifications have been intensively explored in the regi…
Soft Gravitons & the Memory Effect for Plane Gravitational Waves
P. -M. Zhang, C. Duval, G. W. Gibbons +1
The "gravitational memory effect" due to an exact plane wave provides us with an elementary description of the diffeomorphisms associated with soft gravitons. It is explained how t…
The Memory Effect for Plane Gravitational Waves
P. M. Zhang, C. Duval, G. W. Gibbons +1
We give an account of the gravitational memory effect in the presence of the exact plane wave solution of Einstein's vacuum equations. This allows an elementary but exact descripti…
Limits on the anomalous speed of gravitational waves from binary pulsars
Hermano Velten, Jose Beltrán Jiménez, Federico Piazza
A large class of modified theories of gravity used as models for dark energy predict a propagation speed for gravitational waves which can differ from the speed of light. This diff…