A5048665740- Noncommutative and Quantum Gravity Theories
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Pulsars and Gravitational Waves Research
- Relativity and Gravitational Theory
- Quantum Mechanics and Applications
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- High-pressure geophysics and materials
- Geophysics and Sensor Technology
- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Nuclear Physics and Applications
- Statistical and numerical algorithms
- Algebraic and Geometric Analysis
- Magnetic confinement fusion research
- Advanced Differential Geometry Research
- Seismic Waves and Analysis
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Computational Physics and Python Applications
- Neutrino Physics Research
- Nuclear physics research studies
Carleton College
2015-2024
Université Paris Cité
2023
Centre National de la Recherche Scientifique
2023
Laboratoire AstroParticule et Cosmologie
2023
LIGO Scientific Collaboration
2020
St. Olaf College
2015-2017
Whitman College
2010-2012
Indiana University Bloomington
2005-2011
The gravitational couplings of matter are studied in the presence Lorentz and $CPT$ violation. At leading order coefficients for violation, relativistic quantum Hamiltonian is derived from gravitationally coupled minimal standard-model extension. For spin-independent effects, nonrelativistic classical dynamics test source bodies obtained. A systematic perturbative method developed to treat small metric coefficient fluctuations about a Lorentz-violating Minkowski background. post-Newtonian...
The realization that Planck-scale physics can be tested with existing technology through the search for spacetime-symmetry violation brought about development of a comprehensive framework, known as gravitational standard-model extension (SME), studying deviations from exact Lorentz and CPT symmetry in nature. this framework its motivation led to an explosion new tests over past decade considerable theoretical interest subject. This work reviews key concepts associated symmetry, structure SME...
Exceptional sensitivity to spacetime torsion can be achieved by searching for its couplings fermions. Recent experimental searches Lorentz violation are exploited extract new constraints involving 19 of the 24 independent components down levels order ${10}^{\ensuremath{-}31}\text{ }\text{ }\mathrm{GeV}$.
Deviations from relativity are tightly constrained by numerous experiments. A class of unmeasured and potentially large violations is presented that can be tested in the laboratory only via weak-gravity couplings. Specialized highly sensitive experiments could achieve measurements corresponding effects. single constraint $1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}11}\text{ }\text{ }\mathrm{GeV}$ extracted on one combination 12 possible effects ordinary matter. Estimates provided...
Limits on gravitational Cherenkov radiation by cosmic rays are obtained and used to constrain coefficients for Lorentz violation in the gravity sector associated with operators of even mass dimensions, including orientation-dependent effects. We use existing data from cosmic-ray telescopes obtain conservative two-sided constraints 80 distinct Lorentz-violating dimensions four, six, eight, along one-sided three others. Existing limits nine minimal at dimension four improved factors up a...
An effective-field theory framework, the Standard Model Extension, is used to investigate existence of Lorentz and $CPT$-violating effects during gravitational wave propagation. We implement a modified equation for dispersion waves that includes isotropic, anisotropic birefringent dispersion. Using LIGO-Virgo-KAGRA algorithm library suite, we perform joint Bayesian inference source parameters coefficients spacetime-symmetry breaking. From sample 45 high-confidence events selected in GWTC-3...
The direct observation of gravitational waves with Advanced LIGO and Virgo offers novel opportunities to test general relativity in strong-field, highly dynamical regimes. One such opportunity is the measurement gravitational-wave polarizations. While predicts only two tensor polarizations, metric theories gravity allow for up four additional vector scalar modes. detection these alternative polarizations would represent a clear violation relativity. LIGO-Virgo binary black hole merger...
Superconducting-gravimeter measurements are used to test the local Lorentz invariance of gravitational interaction and matter-gravity couplings. The best laboratory sensitivities date achieved via a maximum-reach analysis for 13 Lorentz-violating operators, with some improvements exceeding an order magnitude.Received 9 February 2017DOI:https://doi.org/10.1103/PhysRevLett.119.201101© 2017 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasAlternative gravity...
A largely unconstrained set of relativity-violating effects is studied via the gravitomagnetic effect on intrinsic spins. The results existing comagnetometer experiments are used to place constraints two new combinations these at 10% level. We show that planned improvements in will make them competitive with best sensitivities this elusive class effects. Prospects for measuring conventional general-relativistic also considered.
The Standard-Model Extension (SME) provides a comprehensive effective field-theory framework for the study of CPT and Lorentz symmetry. This work reviews structure philosophy SME some intuitive examples symmetry violation. results recent gravitational tests performed within are summarized including analysis from Laser Interferometer Gravitational-Wave Observatory (LIGO), sensitivities achieved in short-range gravity experiments, constraints cosmic-ray data, by studying planetary ephemerids....
In this work, we review the effective field theory framework to search for Lorentz and CPT symmetry breaking during propagation of gravitational waves. The article is written so as bridge gap between spacetime-symmetry analysis gravitational-waves signals detected by ground-based interferometers. primary physical effects beyond General Relativity that explore here are dispersion birefringence We discuss their implementation in open-source LIGO-Virgo algorithm library suite, well statistical...
The speed of gravitational waves for a single observation can be measured by the time delay among gravitational-wave detectors with Bayesian inference. Then multiple measurements combined to produce more accurate result. From near simultaneous detection and gamma rays originating from GW170817/GRB 170817A, wave signal was found same as approximately one part in ${10}^{15}$. Here we present different method measuring waves, not based on an associated electromagnetic but instead transit across...
We use data from the T-SAGE instrument on board MICROSCOPE space mission to search for Lorentz violation in matter-gravity couplings as described by violating Standard-Model Extension (SME) coefficients $(\bar{a}_\text{eff})_\mu^w$, where ($\mu = T,X,Y,Z$) and ($w e,p,n$) electron, proton neutron. One of phenomenological consequences a non-zero value those is that test bodies different composition fall differently an external gravitational field. This similar "standard" tests universality...
Violations of local Lorentz invariance in the gravitationally coupled matter sector have yet to be sought strong-gravity systems. We present implications matter-sector violation for orbital perturbations pulsar systems and show that analysis data can provide sensitivities these effects exceed current reach Solar System laboratory tests by several orders magnitude.
Sagnac gyroscopes with increased sensitivity are being developed and operated a variety of goals including the measurement general relativistic effects. We show that such systems can be used to search for Lorentz violation within field-theoretic framework Standard-Model Extension, competitive sensitivities achieved. Special deviations from inverse square law gravity among phenomena effectively sought these systems. present necessary equations obtain in relevant experiments.
In this paper, we outline the scientific objectives, experimental layout, and collaborations envisaged for GINGER (Gyroscopes IN GEneral Relativity) project.The project brings together different disciplines aiming at building an array of Ring Laser Gyroscopes (RLGs), exploiting Sagnac effect, to measure continuously, with sensitivity better than picorad/s, large bandwidth (ca. 1 kHz), high dynamic range, absolute angular rotation rate Earth.In address feasibility apparatus respect ambitious...
Physics students are rarely exposed to the style of thinking that goes into theoretical developments in physics until late their education. In this work, we present an alternative traditional statement Newton’s second law makes theory questions accessible early undergraduate studies. Rather than a contrived example, model considered here arises from popular framework for testing Lorentz symmetry used extensively contemporary experiments. Hence, work also provides introduction some key ideas...
The gravitational Standard-Model Extension (SME) is the general field-theory based framework for analysis of CPT and Lorentz violation. In this work we summarize implications violation antimatter gravity in context SME. Implications various attempts to place indirect limits on anomalous are considered SME-based models.
The Standard-Model Extension (SME) provides a comprehensive effective field-theory framework for the study of CPT and Lorentz symmetry. This work reviews structure philosophy SME some intuitive examples symmetry violation. results recent gravitational tests performed within are summarized including analysis from Laser Interferometer Gravitational-Wave Observatory (LIGO), sensitivities achieved in short-range gravity experiments, constraints cosmic-ray data, by studying planetary ephemerids....
The speed of gravitational waves $v_g$ can be measured with the time delay between gravitational-wave detectors. Our study provides a more precise measurement using signals only, compared previous studies. We select 52 events that were detected high confidence by at least two detectors in first three observing runs (O1, O2, and O3) Advanced LIGO Virgo. use Markov chain Monte Carlo nested sampling to estimate posterior distribution for each those events. then combine their distributions find...