A5085945522- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Particle physics theoretical and experimental studies
- Noncommutative and Quantum Gravity Theories
- Dark Matter and Cosmic Phenomena
- Relativity and Gravitational Theory
- Quantum Mechanics and Applications
- Atomic and Subatomic Physics Research
- Quantum Chromodynamics and Particle Interactions
- Quantum Electrodynamics and Casimir Effect
- Pulsars and Gravitational Waves Research
- Cold Atom Physics and Bose-Einstein Condensates
- Computational Physics and Python Applications
- Advanced Frequency and Time Standards
- Complex Systems and Time Series Analysis
- Stochastic processes and financial applications
- High-Energy Particle Collisions Research
- Statistical Mechanics and Entropy
- Quantum Information and Cryptography
- advanced mathematical theories
- Advanced Operator Algebra Research
- Geophysics and Gravity Measurements
- Computability, Logic, AI Algorithms
- Advanced Differential Geometry Research
- Neutrino Physics Research
University of Sussex
2015-2024
Airbus (France)
2023
Johannes Gutenberg University Mainz
2017-2018
University of Delaware
2012
UCLouvain
2008-2009
Université Libre de Bruxelles
2005-2008
University of Oregon
2008
KU Leuven
2008
Institut de Physique Théorique
2007
University of North Carolina at Chapel Hill
2004-2005
Abstract We propose in this White Paper a concept for space experiment using cold atoms to search ultra-light dark matter, and detect gravitational waves the frequency range between most sensitive ranges of LISA terrestrial LIGO/Virgo/KAGRA/INDIGO experiments. This interdisciplinary experiment, called Atomic Experiment Dark Matter Gravity Exploration (AEDGE), will also complement other planned searches exploit synergies with wave detectors. give examples extended sensitivity matter offered...
Abstract We summarise the discussions at a virtual Community Workshop on Cold Atoms in Space concerning status of cold atom technologies, prospective scientific and societal opportunities offered by their deployment space, developments needed before atoms could be operated space. The technologies discussed include atomic clocks, quantum gravimeters accelerometers, interferometers. Prospective applications metrology, geodesy measurement terrestrial mass change due to, e.g., climate change,...
Abstract We present a new framework to study the time variation of fundamental constants in model-independent way. Model independence implies more free parameters than assumed previous studies. Using data from atomic clocks based on 87 Sr, 171 Yb + and 133 Cs, we set bounds controlling fine-structure constant, α , electron-to-proton mass ratio, µ . consider variations timescales ranging minute almost day. In addition, use our results derive some tightest limits date parameter space models...
We define a theory of noncommutative general relativity for canonical spaces. find subclass coordinate transformations acting on spacetimes to be volume-preserving transformations. Local Lorentz invariance is treated as gauge with the spin connection field taken in so(3,1) enveloping algebra. The resulting appears extension unimodular gravitation. compute leading order correction action and derive equations motion weak gravitation field.
We derive fundamental limits on measurements of position, arising from quantum mechanics and classical general relativity. First, we show that any primitive probe or target used in an experiment must be larger than the Planck length, $l_P$. This suggests a Planck-size {\it minimum ball} uncertainty measurement. Next, study interferometers (such as LIGO) whose precision is much finer size individual components hence are not obviously limited by ball. Nevertheless, deduce limit their accuracy...
We reconsider perturbative unitarity violation in the standard model Higgs inflation model. show that Cutkosky cutting rule implied by is fulfilled at one-loop. This a strong indication restored order perturbation theory. then resum certain one-loop diagrams and relevant dressed amplitude fulfills exactly. an example of self-healing mechanism. The original thus consistent does not require any new physics beyond least up to Planck scale.
We derive the first bound on value of Higgs boson nonminimal coupling to Ricci scalar. show that recent discovery at Large Hadron Collider CERN implies is smaller than $2.6\ifmmode\times\else\texttimes\fi{}{10}^{15}$.
We calculate quantum gravitational corrections to the entropy of black holes using Wald formula within an effective field theory approach gravity. The are calculated second order in curvature and we a subset those at third order. show that, curvature, interesting issues appear that had not been considered previously literature. fact Schwarzschild metric receives this expansion has important implications for calculation. Indeed, horizon radius temperature receive corrections. These need be...
Abstract The detection of variations fundamental constants the Standard Model would provide us with compelling evidence new physics, and could lift veil on nature dark matter energy. In this work, we discuss how a network atomic molecular clocks can be used to look for such unprecedented sensitivity over wide range time scales. This is precisely goal recently launched QSNET project: A measuring stability constants. will include state-of-the-art clocks, but also develop next-generation highly...
We calculate quantum gravitational corrections to the amplitude for emission of a Hawking particle by black hole. show explicitly how amplitudes depend on exterior metric (quantum hair). This reveals mechanism which information escapes The state hole is reflected in metric, turn influences quanta.
We examine whether renormalization effects can cause Newton's constant to change dramatically with energy, perhaps even reducing the scale of quantum gravity TeV region without introduction extra dimensions. a model that realizes this possibility and describe experimental signatures from production small black holes.
Using effective field theory techniques, we compute quantum corrections to spherically symmetric solutions of Einstein's gravity and focus in particular on the Schwarzschild black hole. Quantum modifications are covariantly encoded a non-local action. We work quadratic order curvatures simultaneously taking local into account. Looking for perturbatively close that classical general relativity, find an eternal hole remains solution receives no up this curvature expansion. In contrast, massive...
In this paper we point out that Starobinky inflation could be induced by quantum effects due to a large non-minimal coupling of the Higgs boson Ricci scalar. The Starobinsky mechanism provides solution issues attached field values in early universe which metastable would not viable option. We verify explicitly these corrections do destabilize Starobinsky's potential.
It has been shown that the quantum state of graviton field outside a black hole horizon carries information about internal hole. We explain how this allows unitary evaporation: final radiation is complex superposition which depends linearly on initial state. Under time reversal, evolves back to original Formulations paradox fixed semiclassical geometry describe only small subset evaporation Hilbert space, and do not exclude overall unitarity.
We explore the relationship between quantum state of a compact matter source and its asymptotic graviton field. For in an energy eigenstate, is determined at leading order by eigenvalue. Insofar as there are no accidental degeneracies one to map states on boundary spacetime states. Effective field theory allows us compute purely gravitational effect which causes subleading behavior depend internal structure source. This establishes existence ubiquitous hair due effects.
In this work, we calculate the leading order corrections to general relativity formulated on a canonical noncommutative spacetime. These appear in second of expansion theta. First can only gravity-matter interactions. Some implications are briefly discussed.
In this paper we consider general relativity in the large $N$ limit, where stands for number of particles model. Studying resummed graviton propagator, propose to interpret its complex poles as black hole precursors. Our main result is calculation mass and width lightest holes. We show that values masses precursors depend on fields theory. Their can be lowered down TeV region by increasing a hidden sector only interacts gravitationally with standard
In this invited review, we describe Hawking's information paradox and a recently proposed resolution of it. Explicit calculations demonstrate the existence quantum hair on black holes, meaning that state external graviton field depends internal hole. Simple mechanics then implies Hawking radiation amplitudes depend state, resulting in pure final preserves unitarity and, importantly, violates factorization assumption which is central to original paradox. Black hole encoded entangled...