40.2k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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23 papers · 2 filters
On the possibility of experimental detection of the discreteness of time
Marios Christodoulou, Carlo Rovelli
The Bose-Marletto-Vedral experiment tests a non-relativistic quantum effect due to a gravitational interaction. It has received attention because it may soon be within observationa…
Where was past low-entropy?
Carlo Rovelli
I identify where precisely is low-entropy located in the early universe, arguing that some common answers overplay the role of gravity. I discuss the available interpretations of t…
Gravitational birefringence of light in Schwarzschild spacetime
Christian Duval, Loic Marsot, Thomas Schucker
We compute the gravitational birefringence of light as it undergoes gravitational lensing. To this end we re-derive the Souriau-Saturnini equations in the Schwarzschild metric and…
Hairy Schwarzschild-(A)dS black hole solutions in DHOST theories beyond shift symmetry
Jibril Ben Achour, Hongguang Liu
We derive the general conditions for a large family of shift symmetry breaking degenerate higher order scalar-tensor (DHOST) theories to admit stealth black hole solutions. Such bl…
Light Cone Black Holes
Tommaso De Lorenzo, Alejandro Perez
When probed with conformally invariant matter fields, light cones in Minkowski spacetime satisfy thermodynamical relations which are the analog of those satisfied by stationary bla…
Asymptotic analysis of spin foam amplitude with timelike triangles
Hongguang Liu, Muxin Han
The large asymptotic behavior of -dimensional spin foam amplitude is investigated for the extended spin foam model (Conrady-Hnybida extension) on a simplicial complex. We st…
Phenomenology of Quantum Reduced Loop Gravity in the isotropic cosmological sector
Emanuele Alesci, Aurélien Barrau, Gioele Botta +2
Quantum reduced loop gravity is designed to consistently study symmetry reduced systems within the loop quantum gravity framework. In particular, it bridges the gap between the eff…
On the possibility of laboratory evidence for quantum superposition of geometries
Marios Christodoulou, Carlo Rovelli
We analyze the recent proposal of measuring a quantum gravity phenomenon in the lab by entangling two particles gravitationally. We give a generally covariant description of this p…
Raychaudhuri and optical equations for null geodesic congruences with torsion
Simone Speziale
We study null geodesic congruences (NGCs) in the presence of spacetime torsion, recovering and extending results in the literature. Only the highest spin irreducible component of t…
On a quadratic equation of state and a universe mildly bouncing above the Planck temperature
Joanna Berteaud, Johanna Pasquet, Thomas Schücker +1
A 1-parameter class of quadratic equations of state is confronted with the Hubble diagram of supernovae and Baryonic Acoustic Oscillations. The fit is found to be as good as the on…
Numerical methods for EPRL spin foam transition amplitudes and Lorentzian recoupling theory
Pietro Dona, Giorgio Sarno
The intricated combinatorial structure and the non-compactness of the Lorentz group have always made the computation of EPRL spin foam transition amplitudes a ve…
Spacetime Thermodynamics with Contorsion
Tommaso De Lorenzo, Elena De Paoli, Simone Speziale
We prove that a conserved effective energy-momentum tensor for Einstein-Cartan theory can be identified from the Noether identities of the matter Lagrangian, using the torsion fiel…
Ion Traps and the Memory Effect for Periodic Gravitational Waves
P. -M. Zhang, M. Cariglia, C. Duval +3
The Eisenhart lift of a Paul Trap used to store ions in molecular physics is a linearly polarized periodic gravitational wave. A modified version of Dehmelt's Penning Trap is in tu…
Quantum Hubble horizon
Michal Artymowski, Jakub Mielczarek
The article addresses a possibility of obtaining cosmologically relevant effects from the quantum nature of the Hubble horizon. Following the observation made by E.~Bianchi and C.~…
Small black/white hole stability and dark matter
Carlo Rovelli, Francesca Vidotto
We show that the expected lifetime of white holes formed as remnants of evaporated black holes is consistent with their production at reheating. We give a simple quantum descriptio…
Pre-big-bang black-hole remnants and the past low entropy
Carlo Rovelli, Francesca Vidotto
Dark matter could be composed by black-hole remnants formed before the big-bang era in a bouncing cosmology. This hypothetical scenario has major implications on the issue of the a…
A microscopic model for an emergent cosmological constant
Alejandro Perez, Daniel Sudarsky, James D. Bjorken
The value of the cosmological constant is explained in terms of a noisy diffusion of energy from the low energy particle physics degrees of freedom to the fundamental Planckian gra…
A gauge-invariant symplectic potential for tetrad general relativity
Elena De Paoli, Simone Speziale
We identify a symplectic potential for general relativity in tetrad and connection variables that is fully gauge-invariant, using the freedom to add surface terms. When torsion van…
White Holes as Remnants: A Surprising Scenario for the End of a Black Hole
Eugenio Bianchi, Marios Christodoulou, Fabio D'Ambrosio +2
Quantum tunneling of a black hole into a white hole provides a model for the full life cycle of a black hole. The white hole acts as a long-lived remnant, solving the black-hole in…
Interior metric and ray-tracing map in the firework black-to-white hole transition
Carlo Rovelli, Pierre Martin-Dussaud
The possibility that a black hole could tunnel into a white hole has recently received attention. Here we present a metric that improves the 'firework' metric: it describes the ent…
How Information Crosses Schwarzschild's Central Singularity
Fabio D'Ambrosio, Carlo Rovelli
We study the natural extension of spacetime across Schwarzschild's central singularity and the behavior of the geodesics crossing it. Locality implies that this extension is indepe…
Velocity Memory Effect for Polarized Gravitational Waves
P. -M. Zhang, C. Duval, G. W. Gibbons +1
Circularly polarized gravitational sandwich waves exhibit, as do their linearly polarized counterparts, the Velocity Memory Effect: freely falling test particles in the flat after-…
2-vertex Lorentzian Spin Foam Amplitudes for Dipole Transitions
Giorgio Sarno, Simone Speziale, Gabriele V. Stagno
We compute transition amplitudes between two spin networks with dipole graphs, using the Lorentzian EPRL model with up to two (non-simplicial) vertices. We find power-law decreasin…