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Quantum Gravity

Group “Fundamental Interactions”

The QG equipe works on a major unsolved question in fundamental physics: understanding the quantum properties of gravity. Since gravity is the dynamics of spacetime, this amount to study the quantum behaviour of time and space.

Loop Quantum Gravity (LQG), is a main approach towards the solution of this problem, and the CPT is a leader in this field. The group works on the formal definition of the theory, its mathematical aspects, and its applications.

Among the formal developments, the group is studying the properties of the coherent semiclassical states which describe quantum geometry, and is developing a reformulation of the theory in terms of twistors which should simplify its application.

The main applications are to early cosmology and to black hole physics. The objective of the research is to find observable phenomena that could test the theory empirically.

In the context of early cosmology, LQG allows to explore the region around the initial singularity predicted by classical general relativity. The theory indicates that the present expansion phase was preceded by a contraction phase.

In the context of Black hole physics, LQG opens the possibility to study the physics of the high-curvature region (the “Planck star”), suggesting that the singularity predicted by classical general relativity is cured by quantum effects. A black hole is consequently unstable: it can explode via a quantum tunnelling process, akin to conventional radioactive nuclear decay. The equipe studies the signals produced by such black hole explosions. One hypothesis is that currently observed astrophysical phenomena such as very-high-energy gamma rays or Fast Radio Bursts could be originated by such a quantum gravitational explosion of primordial black holes.

The quantum structure of spacetime is also relevant for the thermal properties of the black holes and for the so-called black-hole “information paradox”. The group is at the forefront of the analysis of these questions.

Directory of Members

D’Ambrosio Fabio PhD candidate
Email
De Lorenzo Tommaso PhD candidate
Email
Krajewski Thomas University faculty
+33.4.91.26.95.61 Email
Liu Hongguang PhD candidate
Email
Martin-Dussaud Pierre PhD candidate
Email
Martinez Daniel PhD candidate
Email
Perez Alejandro University faculty
+33.4.91.26.97.98 Email
Rovelli Carlo University faculty
Chef de l’équipe « Gravité quantique »
+33.4.91.26.96.44 Email
SARNO Giorgio PhD candidate
Email
Saul Andres Guest
Email
Speziale Simone Researcher
+33.4.91.26.95.46 Email
Vidotto Francesca Guest
Email

List of Publications

86 results
Preprint, Working paper
Giorgio Sarno, Simone Speziale, Gabriele Stagno
2-vertex Lorentzian Spin Foam Amplitudes for Dipole Transitions
2018
Preprint, Working paper
Marios Christodoulou, Fabio D'Ambrosio
Characteristic Time Scales for the Geometry Transition of a Black Hole to a White Hole from Spinfoams
2018
Journal article
L. Rosa, S. Avino, E. Calloni, S. Caprara, M. De Laurentis, R. De Rosa, Giampiero Esposito, M. Grilli, E. Majorana, G. P. Pepe, S. Petrarca, P. Puppo, P. Rapagani, F. Ricci, C. Rovelli, P. Ruggi, N. L. Saini, C. Stornaiolo, F. Tafuri
Casimir energy for two and three superconducting coupled cavities: numerical calculations
The European Physical Journal Plus, Springer, 2017, 132 (11), pp.478. 〈10.1140/epjp/i2017-11750-y〉
Journal article
Thibaut Josset
The Second Law of Thermodynamics at the Microscopic Scale
Foundations of Physics, Springer Verlag, 2017, 47 (9), pp.1185-1190. 〈10.1007/s10701-017-0104-5〉
Journal article
Eugenio Bianchi, Hal M. Haggard, Carlo Rovelli
The boundary is mixed
General Relativity and Gravitation, Springer Verlag, 2017, 49 (8), pp.100. 〈10.1007/s10714-017-2263-2〉
Journal article
Carlo Rovelli
Michelangelo's Stone: an Argument against Platonism in Mathematics
European Journal for Philosophy of Science, Springer, 2017, 7 (2), pp.285-297. 〈10.1007/s13194-016-0159-8〉
Book Section
J. Fernando Barbero G., Alejandro Perez
Quantum Geometry and Black Holes
A. Ashtekar; J. Pullin. Loop Quantum Gravity : The First 30 Years , 4, World Scientific, pp.241-279, 2017, 100 Years of General Relativity, 978-981-3209-92-3. 〈10.1142/9789813220003_0008〉
Journal article
Laurent Freidel, Alejandro Perez, Daniele Pranzetti
Loop gravity string
Physical Review D, American Physical Society, 2017, 95 (10), pp.106002. 〈10.1103/PhysRevD.95.106002〉
Journal article
Alberto S. Cattaneo, Alejandro Perez
A note on the Poisson bracket of 2d smeared fluxes in loop quantum gravity
Classical and Quantum Gravity, IOP Publishing, 2017, 34 (10), pp.107001. 〈10.1088/1361-6382/aa69b4〉
Preprint, Working paper
Valerio Astuti, Marios Christodoulou, Carlo Rovelli
Volume Entropy
2017
86 results

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