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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

Krajewski Thomas University faculty
+33.4.91.26.95.53 Email
ODAK Gloria PhD candidate
+33.4.91.26.97.74 Email
Perez Alejandro University faculty
Chef de l’équipe « Gravité quantique »
+33.4.91.26.97.98 Email
RIBISI Salvatore PhD candidate
Email
RIGNON BRET Antoine PhD candidate
+33.4.91.26.95.57 Email
Rovelli Carlo Emeritus
+33.4.91.26.96.44 Email
Saul Andres Guest
Email
Speziale Simone Researcher
Chef du Groupe « Interactions fondamentales »
+33.4.91.26.95.47 Email
VIOLLET Sami PhD candidate
+33.4.91.26.95.56 Email

List of Publications

130 results
Journal article
Fabio M. Mele, Johannes Münch, Stratos Pateloudis
Quantum corrected polymer black hole thermodynamics: mass relations and logarithmic entropy correction
JCAP, 2022, 02, pp.011. ⟨10.1088/1475-7516/2022/02/011⟩
Journal article
Carlo Rovelli
The Old Fisherman's Mistake
Metaphilosophy, 2022, 53 (5), pp.623-631. ⟨10.1111/meta.12589⟩
Thesis
Lautaro Amadei
Implications théoriques et phénoménologiques de la géométrie discrète
General Relativity and Quantum Cosmology [gr-qc]. Aix Marseille Université (AMU), 2021. English. ⟨NNT : ⟩
Journal article
Annalisa Allocca, Saverio Avino, Enrico Calloni, Sergio Caprara, Massimo Carpinelli, Domenico D’urso, Martina de Laurentis, Rosario de Rosa, L. Errico, G. Gagliardi, Marco Grilli, Valentina Mangano, Maria Marsella, Luca Naticchioni, Antonio Pasqualetti, Gianpiero Pepe, Maurizio Perciballi, Luca Pesenti, Paola Puppo, Piero Rapagnani, Fulvio Ricci, Luigi Rosa, Carlo Rovelli, Davide Rozza, P. Ruggi, Naurang L Saini, Valeria Sequino, Valeria Sipala, Daniela Stornaiuolo, Francesco Tafuri
Picoradiant tiltmeter and direct ground tilt measurements at the Sos Enattos site
The European Physical Journal Plus, 2021, 136 (10), pp.1069. ⟨10.1140/epjp/s13360-021-01993-w⟩
Journal article
Sergey Alexandrov, Simone Speziale, Tom Zlosnik
Canonical structure of minimal varying $\Lambda$ theories
Classical and Quantum Gravity, 2021, 38 (17), pp.175011. ⟨10.1088/1361-6382/ac1852⟩
Journal article
L. Burderi, A. Sanna, T. Di Salvo, L. Amati, G. Amelino-Camelia, M. Branchesi, S. Capozziello, E. Coccia, M. Colpi, E. Costa, N. D’amico, P. de Bernardis, M. de Laurentis, M. Della Valle, H. Falcke, M. Feroci, F. Fiore, F. Frontera, A. Gambino, G. Ghisellini, K. Hurley, R. Iaria, D. Kataria, C. Labanti, G. Lodato, B. Negri, A. Papitto, T. Piran, A. Riggio, Carlo Rovelli, A. Santangelo, F. Vidotto, S. Zane
GrailQuest: hunting for atoms of space and time hidden in the wrinkle of Space-Time
Experimental Astronomy, 2021, 51 (3), pp.1255-1297. ⟨10.1007/s10686-021-09745-5⟩
Journal article
Carlo Rovelli, Enrico Calloni
High-bandwidth beam balance for vacuum-weight experiment and Newtonian noise subtraction
The European Physical Journal Plus, 2021, 136 (3), pp.335. ⟨10.1140/epjp/s13360-021-01214-4⟩
Journal article
Carlo Rovelli
Why Quantum is Relative
New scientist, 2021, 249 (3325), pp.36-40. ⟨10.1016/S0262-4079(21)00426-7⟩
Journal article
Carlo Rovelli
Politics should listen to science, not hide behind it
Nature Materials, 2021, 20 (2), pp.272. ⟨10.1038/s41563-020-00891-3⟩
Journal article
Andrea Di Biagio, Carlo Rovelli
Stable Facts, Relative Facts
Foundations of Physics, 2021, 51 (1), pp.30. ⟨10.1007/s10701-021-00429-w⟩
130 results

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