A5032383776- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Algebraic structures and combinatorial models
- Nonlinear Waves and Solitons
- Noncommutative and Quantum Gravity Theories
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Pulsars and Gravitational Waves Research
- Advanced Topics in Algebra
- Computational Physics and Python Applications
- Quantum Mechanics and Applications
- Relativity and Gravitational Theory
- Geophysics and Gravity Measurements
- Physics of Superconductivity and Magnetism
- Dark Matter and Cosmic Phenomena
- Quantum and Classical Electrodynamics
- Gamma-ray bursts and supernovae
- Advanced Algebra and Geometry
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Advanced NMR Techniques and Applications
- Homotopy and Cohomology in Algebraic Topology
- Nuclear physics research studies
- Astrophysics and Cosmic Phenomena
- Quantum chaos and dynamical systems
Vrije Universiteit Brussel
2011-2024
International Solvay Institutes
2008-2023
University of Antwerp
2013-2023
KU Leuven
1987-2013
Lawrence Berkeley National Laboratory
1991-1995
European Organization for Nuclear Research
1993-1995
Stony Brook University
1989-1995
State University of New York
1989-1995
U.S. National Science Foundation
1992
Office of Science
1992
A bstract The recent results from the Pulsar Timing Array (PTA) collaborations show first evidence for detection of a stochastic background gravitational waves at nHz frequencies. This discovery has profound implications physics both late and early Universe. In fact, together with interpretation in terms supermassive black hole binaries, many sources Universe can provide viable explanations as well. this paper, we study wave sourced by network axion-like-particle (ALP) domain walls...
Abstract We study the early Universe evolution of axion-like particle (ALP) domain walls taking into account effect friction from particles in surrounding plasma, including case thermal equilibrium and frozen out species. characterize force interactions within ALP effective theory, providing new results for fermion contribution as well identifying simple conditions to be relevant during wall life time. When dominates, network departs standard scaling regime corresponding gravitational wave...
We present a novel baryogenesis mechanism in which the asymmetry is sourced from heavy particles either gain their mass or are created during bubble expansion strong first order phase transition. These then decay $CP$ and baryon number violating way inside bubble. The inherently out of equilibrium sufficiently dilute after wall crossing so third Sakharov condition easily met. Washout avoided provided reheat temperature below scale particles. relies on moderate supercooling relativistic walls...
We investigate the reach of LIGO/Virgo/KAGRA detectors in search for signatures first-order phase transitions early Universe. Utilizing data from first three observing runs, we derive constraints on parameters underlying gravitational-wave background, focusing characterized by strong supercooling. As an application our analysis, determine bounds parameter space two representative particle physics models. also comment expected third-generation probing supercooled transitions.
A bstract We investigate the integrable Yang-Baxter deformation of 2d Principal Chiral Model with a Wess-Zumino term. For arbitrary groups, one-loop β -functions are calculated and display surprising connection between classical quantum physics: integrability condition is necessary to prevent new couplings being generated by renormalisation. show these theories admit an elegant realisation Poisson-Lie T-duality acting as simple inversion coupling constants. The self-dual point corresponds...
Chiral bosons, or self-dual $p$-form fields, are ubiquitous in string theoretic contexts but challenging to treat. Lagrangian constructions invariably introduce a complexity be it auxiliary fields sacrificing Lorentz invariance. In this paper we show how pass between such different approaches chiral bosons starting from Chern Simons point of view recover formulations Pasti, Sorokin and Tonin Mkrtchyan. This leads novel generalization the latter include non-Abelian 2-dimensions,...
The study of electric quadrupole transitions from the ground state into symmetric states and mixed symmetry in deformed nucleus $^{156}\mathrm{Gd}$ by inelastic electron scattering has been used to derive effective neutron proton boson charges for $E2$ operator framework interacting-boson model. values ${e}_{\ensuremath{\pi}}$ ${e}_{\ensuremath{\nu}}$ differ at most 30% rotational limit.
We show that the geometric interpretation of D-branes in WZW models as twisted conjugacy classes persists $\lambda$--deformed theory. obtain such configurations by demanding a monodromy matrix constructed from Lax connection theory continues to produce conserved charges presence boundaries. In this way D-brane obtained correspond `integrable' boundary configurations. illustrate with examples based on $SU(2)$ and $SL(2,\mathbb{R})$, comment relation these both non-Abelian T-duality...