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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

AMADEI Lautaro PhD candidate
Email
Gozzini Francesco 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
Chef de l’équipe « Gravité quantique »
+33.4.91.26.97.98 Email
Rovelli Carlo University faculty
+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

91 results
Journal article
Valerio Astuti, Marios Christodoulou, Carlo Rovelli
Volume Entropy
Classical and Quantum Gravity, IOP Publishing, 2019, 36 (5), pp.055012. ⟨10.1088/1361-6382/aafec7⟩
Journal article
Laurent Freidel, Alejandro Perez
Quantum gravity at the corner
Universe, MDPI, 2018, 4 (10), pp.107. ⟨10.3390/universe4100107⟩
Preprint, Working paper
Seramika Ariwahjoedi, Valerio Astuti, Jusak Sali Kosasih, Carlo Rovelli, Freddy Permana Zen
Statistical discrete geometry
2018
Preprint, Working paper
Goffredo Chirco, Thibaut Josset
Statistical mechanics of covariant systems with multi-fingered time
2018
Preprint, Working paper
Carlo Rovelli
Black holes have more states than those giving the Bekenstein-Hawking entropy: a simple argument
2018
Preprint, Working paper
Alejandro Perez, Daniel Sudarsky
Dark energy from quantum gravity discreteness
2018
Journal article
Marios Christodoulou
Geometry Transition in Covariant Loop Quantum Gravity
Acta Physica Slovaca, 2018, 68 (1-2), pp.1-185. ⟨http://www.physics.sk/aps/pub.php?y=2018&pub=aps-18-01⟩
Journal article
Carlo Rovelli
Space is blue and birds fly through it
Philosophical Transactions of the Royal Society A: Physical and Engineering Sciences (1990–1995), Royal Society, The, In press, ⟨10.1098/rsta.2017.0312⟩
Journal article
Carlo Rovelli
Meaning = Information + Evolution
Foundations of Physics, Springer Verlag, In press
Journal article
Carlo Rovelli
Shan Gao: The Meaning of the Wave Function. In Search of the Ontology of Quantum Mechanics.
Foundations of Physics, Springer Verlag, 2018, 48 (6), pp.747-749. ⟨10.1007%2Fs10701-018-0159-y⟩
91 results

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