Strong Gravity research at Perimeter Institute is devoted to understanding both the theoretical and observational aspects of systems in which gravity is very strong (i.e., spacetime is highly curved or dynamical],. On one hand, this means studying extreme astrophysical systems, like black holes and neutron stars, as well as making and testing predictions for existing and forthcoming gravitational wave detectors, electromagnetic telescopes, and particle astrophysics experiments. On the other hand, it also includes a range of non-astrophysical topics, such as the instabilities of higher-dimensional black holes or the dynamics of strongly-coupled quantum field theories (via holography). The goal of strong gravity researcher is to test the validity of Einstein's theory of gravity, constrain proposed alternatives, understand the most extreme astrophysical systems, and investigate the ways in which highly curved or dynamical spacetimes are linked with a range of other problems in fundamental physics.
Format results
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11 talks-Collection Number C18010
Talk
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Searching for Light Bosons with Black Hole Superradiance
Savas Dimopoulos Perimeter Institute for Theoretical Physics
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Superradiant instabilities and rotating black holes
Sam Dolan University of Southampton
PIRSA:18050028 -
Superradiant instabilities and rotating black holes
Avery Broderick University of Waterloo
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Measuring Stellar-Mass Black Hole Spins via X-ray Spectroscopy
James Steiner Massachusetts Institute of Technology (MIT)
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Superradiance Beyond the Linear Regime
Frans Pretorius Princeton University
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Characterization of compact objects with present and future ground-based gravitational-wave detectors
Salvatore Vitale Massachusetts Institute of Technology (MIT)
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LIGO and Virgo continuous wave searches - Overview and all-sky searches
keith Riles University of Michigan–Ann Arbor
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Directed and targeted searches for continuous gravitational waves
Sylvia Zhu Albert Einstein Institute
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Computational Methods for General Relativistic Magnetohydrodynamics: con2prim an
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Quantum Black Holes in the Sky?
34 talks-Collection Number C17055Talk
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Quantifying the evidence for black holes with GW and EM probes
Paolo Pani Instituto Superior Tecnico - Departamento de Física
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Echoes from the Abyss: Tentative Evidence for Planck-Scale Structure at Black Hole Horizons
Jahed Abedi University of Stavanger (UiS)
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Improvements on the methods for searching echoes
Julian Westerweck Albert Einstein Institute
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A model-independent search for gravitational-wave echoes
Archisman Ghosh Institucio Catalana de Recerca I Estudis Avancats (ICREA) - Universitat de Barcelona
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An alternative significance estimation for the evidence for echoes
Alex Nielsen Albert Einstein Institute
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Discussion: Evidence for Echoes
PIRSA:17110074 -
Inspiral Tests of Strong-field Gravity and Ringdown Tests of Quantum Black Holes
Kent Yagi University of Virginia
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A Recipe for Echoes
Aaron Zimmerman The University of Texas at Austin
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Lights, Sounds, Action in Strong Field Gravity.
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PSI 2017/2018 - Relativity (Turok)
15 talks-Collection Number C17036Talk
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PSI 2017/2018 - Relativity - Lecture 1
Neil Turok University of Edinburgh
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PSI 2017/2018 - Relativity - Lecture 2
Neil Turok University of Edinburgh
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PSI 2017/2018 - Relativity - Lecture 3
Neil Turok University of Edinburgh
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PSI 2017/2018 - Relativity - Lecture 4
Neil Turok University of Edinburgh
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PSI 2017/2018 - Relativity - Lecture 5
Neil Turok University of Edinburgh
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PSI 2017/2018 - Relativity - Lecture 6
Neil Turok University of Edinburgh
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PSI 2017/2018 - Relativity - Lecture 7
Neil Turok University of Edinburgh
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PSI 2017/2018 - Relativity - Lecture 8
Neil Turok University of Edinburgh
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2016 Midwest Relativity Meeting
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PSI 2016/2017 - Relativity (Turok)
14 talks-Collection Number C16010Talk
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PSI 2016/2017 - Relativity - Lecture 1
Neil Turok University of Edinburgh
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PSI 2016/2017 - Relativity - Lecture 2
Neil Turok University of Edinburgh
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PSI 2016/2017 - Relativity - Lecture 3
Neil Turok University of Edinburgh
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PSI 2016/2017 - Relativity - Lecture 4
Neil Turok University of Edinburgh
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PSI 2016/2017 - Relativity - Lecture 5
Neil Turok University of Edinburgh
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PSI 2016/2017 - Relativity - Lecture 6
Neil Turok University of Edinburgh
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PSI 2016/2017 - Relativity - Lecture 7
Neil Turok University of Edinburgh
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EHT 2014
54 talks-Collection Number C14041Talk
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Welcome to Perimeter Institute and the EHT 2014 Conference
Neil Turok University of Edinburgh
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Growth of supermassive black holes and their relationships to their host galaxies
Marta Volonteri Institut d'Astrophysique de Paris
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Polarized emission from Black Hole Accretion Disks and Jets
Jonathan McKinney University of Maryland, College Park
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Stellar Orbits at the Galactic Center
Andrea Ghez University of California, Los Angeles
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Particle Acceleration and Non-thermal Emission in Radiatively Inefficient Accretion Flows
Eliot Quataert University of California, Berkeley
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Strong Gravity Lecture
William East Perimeter Institute for Theoretical Physics
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Strong Gravity Lecture
William East Perimeter Institute for Theoretical Physics
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Strong Gravity Lecture
William East Perimeter Institute for Theoretical Physics
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Searching for New Particles with Black Hole Superradiance
11 talks-Collection Number C18010Black hole superradiance is a fascinating process in general relativity and a unique window on ultralight particles beyond the standard model. Bosons -- such as axions and dark photons -- with Compton wavelengths comparable to size of astrophysical black holes grow exponentially to form large clouds spinning down the black hole in the process and produce monochromatic continuous gravitational wave radiation. In the era of gravitational wave astronomy and increasingly sensitive observations of astrophysical black holes and their properties superradiance of new light particles is a promising avenue to search for new physics in regimes inaccessible to terrestrial experiments. This workshop will bring together theorists data analysts and observers in particle physics gravitational wave astronomy strong gravity and high energy astrophysics to explore the signatures of black hole superradiance and to study the current and future possibilities of searching for new particles with black holes.
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Computational Methods for General Relativistic Magnetohydrodynamics: con2prim an
-Collection Number C18001Computational Methods for General Relativistic Magnetohydrodynamics are important means of studying compact astrophysical objects such as neutron stars and core-collapse supernovae relevant e.g. to understand sources of gravitational radiation.Particular crucial elements of such methods including solving non-linear equations to extract the microphysical state from the conserved fluxes (endearingly called con2prim) or handling realistic equations of state (EOS) that are only given approximately in a tabulated manner. The state of the art for algorithms addressing these issue leaves to be desired and significantly limits stabilityaccuracy and performance of todays calculations.This workshop aims to review the known algorithmic and computational shortcomings list requirements that an ideal solution should haveand discuss potential practical solutions.
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Quantum Black Holes in the Sky?
34 talks-Collection Number C17055The past decade has witnessed significant breakthroughs in understanding the quantum nature of black holes, with insights coming from quantum information theory, numerical relativity, and string theory. At the same time, astrophysical and gravitational wave observations can now provide an unprecedented window into the phenomenology of black hole horizons. This workshop seeks to bring together leading experts in these fields to explore new theoretical and observational opportunities and synergies that could improve our physical understanding of quantum black holes.
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Lights, Sounds, Action in Strong Field Gravity.
-Collection Number C17062With LIGO/VIRGO in operation and detecting gravitational waves, the era of gravitational wave astronomy is upon us. In anticipation of further observations, this workshop will discuss the physics, astrophysics, and observational prospects--as well as challenges--in gravitational wave sources including black holes, neutron stars, and other fascinating objects, in both the near and long term.
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PSI 2017/2018 - Relativity (Turok)
15 talks-Collection Number C17036PSI 2017/2018 - Relativity (Turok) -
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PSI 2016/2017 - Relativity (Turok)
14 talks-Collection Number C16010PSI 2016/2017 - Relativity (Turok) -
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Strong Gravity Lecture
William East Perimeter Institute for Theoretical Physics
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Strong Gravity Lecture
William East Perimeter Institute for Theoretical Physics
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Bridging Scales in Black Hole Accretion and Feedback: Magnetized Bondi Accretion in 3D GRMHD
Hyerin Cho Harvard University
Fueling and feedback couple supermassive black holes (SMBHs) to their host galaxies across many orders of magnitude in spatial and temporal scales, making this problem notoriously challenging to simulate. We use a multi-zone computational method based on the general relativistic magneto-hydrodynamic (GRMHD) code KHARMA that allows us to span 7 orders of magnitude in spatial scale, to simulate accretion onto a non-spinning SMBH from an external medium with Bondi radius ~ 2e5 G*M/c^2, where M is the SMBH mass. For the classic idealized Bondi problem, spherical gas accretion without magnetic fields, our simulation results agree very well with the general relativistic analytic solution. Meanwhile, when the accreting gas is magnetized, the SMBH magnetosphere becomes saturated with a strong magnetic field. The density profile varies as ~ r^(-1) rather than r^(-3/2) and the accretion rate is consequently suppressed by over 2 orders of magnitude below the Bondi rate. We find continuous energy feedback from the accretion flow to the external medium at a level of 1% of the accreted rest mass energy (~ 0.01 Mdot * c^2). Energy transport across these widely disparate scales occurs via turbulent convection triggered by magnetic field reconnection near the SMBH. Thus, strong magnetic fields that accumulate on horizon scales transform the flow dynamics far from the SMBH and naturally explain observed extremely low accretion rates compared to the Bondi rate, as well as at least part of the energy feedback.
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Strong Gravity Lecture
William East Perimeter Institute for Theoretical Physics