A5071721065- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Particle physics theoretical and experimental studies
- Noncommutative and Quantum Gravity Theories
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Geophysics and Gravity Measurements
- Computational Physics and Python Applications
- Relativity and Gravitational Theory
- Quantum Electrodynamics and Casimir Effect
- Neutrino Physics Research
- High-Energy Particle Collisions Research
- Pulsars and Gravitational Waves Research
- Solar and Space Plasma Dynamics
- Nonlinear Waves and Solitons
- Astrophysics and Cosmic Phenomena
- Advanced Differential Geometry Research
- advanced mathematical theories
- Particle Accelerators and Free-Electron Lasers
- Physics of Superconductivity and Magnetism
- Distributed and Parallel Computing Systems
- Algebraic structures and combinatorial models
- Astrophysical Phenomena and Observations
- Radio Astronomy Observations and Technology
Laboratoire de Physique Théorique et Hautes Energies
2016-2025
Sorbonne Université
2016-2025
Centre National de la Recherche Scientifique
2016-2025
Chulalongkorn University
2024-2025
Stony Brook University
2024
University of Liverpool
2022-2024
Institute for Advanced Study
2023-2024
New York University
2023-2024
Simons Center for Geometry and Physics
2024
Harvard University
2023
We construct a supergravity model whose scalar degrees of freedom arise from chiral superfield and are solely scalaron an axion that is very heavy during the inflationary phase. The includes second $X$, which subject however to constraint $X^2=0$ so it describes only Volkov - Akulov goldstino auxiliary field. also dual higher derivative model, rests on curvature ${\cal R}$ R}^2=0$, where arises gauge invariant gravitino field strength as $\gamma^{mn} {\cal D}_m \psi_n$. final bosonic action...
Abstract We propose a new dark matter contender within the context of so-called “dark dimension”, an innovative 5-dimensional construct that has compact space with characteristic length-scale in micron range. The candidate is radion, bulk scalar field whose quintessence-like potential drives inflationary phase described by de Sitter (or approximate) solution Einstein equations. show radion could be ultralight and thereby serve as fuzzy candidate. advocate simple cosmological production...
We study the landscape of lower-dimensional vacua standard model (SM) coupled to gravity in presence so-called “dark dimension” size <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>R</a:mi><a:mo>⊥</a:mo></a:msub></a:math> micron range, focusing on validity swampland conjecture forbidding nonsupersymmetric anti–de Sitter (AdS) a consistent quantum theory. first adopt working assumption that right-handed neutrinos propagate bulk, so neutrino Yukawa couplings...
The conclusions of the Physics Working Group international scoping study a future Neutrino Factory and super-beam facility (the ISS) are presented. ISS was carried by community between NuFact05, 7th International Workshop on Factories Superbeams, Laboratori Nazionali di Frascati, Rome, June 21-26, 2005) NuFact06 (Ivine, California, 24{30 August 2006). physics case for an extensive experimental programme to understand properties neutrino is presented role high-precision measurements...
We study the trace-anomaly-induced dynamics of conformal factor four-dimensional (4D) quantum gravity. The resulting effective scalar theory is ultraviolet renormalizable, and possesses a nontrivial, infrared stable fixed point. exact anomalous scaling dimension at critical point derived. argue that this describes 4D gravity large distances provides framework for dynamical solution cosmological-constant problem.
In addition to simple scale invariance, a universe dominated by dark energy naturally gives rise correlation functions possessing full conformal invariance. This is due the mathematical isomorphism between group of certain 3 dimensional slices de Sitter space and isometry SO(4,1). standard homogeneous isotropic cosmological model in which primordial density perturbations are generated during long vacuum phase, embedding flat spatial sections induces invariant perturbation spectrum definite...
When considered in the Palatini formalism, Starobinsky model does not provide us with a mechanism for inflation due to absence of propagating scalar degree freedom. By (non)--minimally coupling fields formalism we can principle describe inflationary epoch. In this article, focus on minimally coupled quartic and natural models. Both theories are excluded their simplest realization since they predict values observables that outside limits set by Planck data. However, addition $R^2$ term use...
Very recently, it was suggested that combining the Swampland program with smallness of dark energy and confronting these ideas to experiment lead prediction existence a single extra-dimension (dubbed dimension) characteristic length-scale in micron range. We show rate Hawking radiation slows down for black holes perceiving dimension discuss impact our findings assessing matter fraction could be composed primordial holes. demonstrate species scale ${\cal O}(10^{10}~{\rm GeV})$, an...
It was recently understood that if the swampland conjectures are confronted to experiment they naturally point a solution of cosmological hierarchy problem in which smallness dark energy is ascribed an internal (dark) dimension with characteristic length-scale micron range. later inferred universal coupling Standard Model fields massive spin-2 Kaluza-Klein (KK) excitations graviton leads matter candidate. Since partial decay widths KK gravitons into visible sector must be relatively small...
We study the possible correspondence between 5-dimensional primordial black holes and massive KK gravitons as dark matter candidate within recently proposed dimension scenario that addresses cosmological hierarchy problem. First, we show in local universe a population of with $M_{\rm BH}\sim 7\times 10^{13}~{\rm g}$ would be practically indistinguishable from tower $m_{\rm DM} \sim 50~{\rm keV}$. Second, connect mass increase related temperature decrease cooling spin-2 excitations graviton....
A bstract We argue for a relation between the supersymmetry breaking scale and measured value of dark energy density Λ. derive it by combining two quantum gravity consistency swampland constraints, which tie Λ gravitino mass M 3 / 2 , respectively, to light Kaluza-Klein tower and, therefore, UV cut-off effective theory. Whereas constraint on has recently led Dark Dimension scenario, with prediction single mesoscopic extra dimension micron size, we use infer implications such scenario...
In a recent publication we studied the decay rate of primordial black holes perceiving dark dimension, an innovative five-dimensional (5D) scenario that has compact space with characteristic length scale in micron range. We demonstrated Hawking radiation 5D slows down compared to 4D same mass. Armed our findings showed for species <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi mathvariant="script">O</a:mi><a:mo...