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Testing Kerr black hole mimickers with quasi-periodic oscillations from GRO J1655-40
Abstract: The measurements of quasi-periodic oscillations (QPOs) provide a quite powerful tool to test the nature of astrophysical black hole candidates in the strong gravitational field regime. In this paper, we use QPOs within...
Hidden Spectral Symmetries and Mode Stability of Subextremal Kerr(-de Sitter) Black Holes
Abstract: We uncover hidden spectral symmetries of the Teukolsky equation in Kerr(-de Sitter) black holes, recently conjectured by Aminov, Grassi and Hatsuda (Ann. Henri Poincaré 23, 1951-1977, 2022, and Gen. Relativ. Grav....
Raman solitons in waveguides with simultaneous quadratic and Kerr nonlinearities
We analyze Raman-induced self-frequency shift in two-component solitons supported by both quadratic and cubic nonlinearities. Treating Raman terms as a perturbation, we derive expressions for soliton velocity and frequency...
Testing Kerr black hole mimickers with quasi-periodic oscillations from GRO J1655-40
Abstract: The measurements of quasi-periodic oscillations (QPOs) provide a quite powerful tool to test the nature of astrophysical black hole candidates in the strong gravitational field regime. In this paper, we use QPOs within...
Threshold of complexity and Arnold tongues in Kerr-ring microresonators
We show that the threshold condition for two pump photons to convert into a pair of the sideband ones in Kerr microresonators with high-quality factors breaks the pump laser parameter space into a sequence of narrow in frequency...
Testing Kerr black hole mimickers with quasi-periodic oscillations from GRO J1655-40
Abstract The measurements of quasi-periodic oscillations (QPOs) provide a quite powerful tool to test the nature of astrophysical black hole candidates in the strong gravitational field regime. In...
Ursinus Magazine, Summer 1969
Henry R. Taylor, Milton E. Detterline, Lucille Hunt Bone, Adele Boyd, Raymond V. Gurzynski, Richard P. Richter, Clark Kerr, Richard Winchester, Ted Taylor, Donald L. Helfferich
Jan 01, 0001
Clark Kerr: It is the best of times, it is the worst of times Alumni Day 1969: Tropp takes office as Alumni President; Annual business meeting held; Outstanding graduates honored; Centennial seminar; Honoraries awarded ...
Ursinus College Collegeville Pennsylvania alumni Deaths Marriages Clark Kerr Walter M. Tropp Gerald M. Edelman Mildred G. Fox Football fundraising track team baseball lacrosse softball tennis field hockey golf Thomas J. Beddow William W. Heefner Frank Smith Higher Education Social History United States History
Published by: Ursinus College
The Kijowski–Liu–Yau quasi-local mass of the Kerr black hole horizon
We use the isometric embedding of the spatial horizon of fast rotating Kerr
black hole in a hyperbolic space to compute the quasi-local mass of the horizon
for any value of the spin parameter $j=J/m^2$. The mass is...
Testing Kerr black hole mimickers with quasi-periodic oscillations from GRO J1655-40
Abstract The measurements of quasi-periodic oscillations (QPOs) provide a quite powerful tool to test the nature of astrophysical black hole candidates in the strong gravitational field regime. In...
The Kijowski–Liu–Yau quasi-local mass of the Kerr black hole horizon * * Dedicated to Gary Gibbons on the occasion of his 75th birthday.
Abstract: We use an isometric embedding of the cross-over surface of the outer horizon of a rapidly rotating Kerr black hole in a hyperbolic space to compute the quasi-local mass of the horizon for any allowed value of the spin...
Mode Stability for the Teukolsky Equation on Extremal and Subextremal Kerr Spacetimes
Rita Teixeira da Costa
Jul 17, 2020
Abstract: We prove that there are no exponentially growing modes nor modes on the real axis for the Teukolsky equation on Kerr black hole spacetimes, both in the extremal and subextremal case. We also give a quantitative...
Testing Kerr black hole mimickers with quasi-periodic oscillations from GRO J1655-40
Abstract: The measurements of quasi-periodic oscillations (QPOs) provide a quite powerful tool to test the nature of astrophysical black hole candidates in the strong gravitational field regime. In this paper, we use QPOs within...
Raman solitons in waveguides with simultaneous quadratic and Kerr nonlinearities
We analyze Raman-induced self-frequency shift in two-component solitons supported by both quadratic and cubic nonlinearities. Treating Raman terms as a perturbation, we derive expressions for soliton velocity and frequency...
Exploring the role of stromal osmoregulation in cancer and disease using executable modelling.
David Shorthouse, Angela Riedel, Emma Kerr, Luisa Pedro, Dóra Bihary, Shamith Samarajiwa, Carla P Martins, Jacqueline Shields, Benjamin A Hall
Oct 18, 2018
Mode Stability for the Teukolsky Equation on Extremal and Subextremal Kerr Spacetimes
Rita Teixeira da Costa
Jul 28, 2021
Abstract: We prove that there are no exponentially growing modes nor modes on the real axis for the Teukolsky equation on Kerr black hole spacetimes, both in the extremal and subextremal case. We also give a quantitative...
Threshold of complexity and Arnold tongues in Kerr-ring microresonators
We show that the threshold condition for two pump photons to convert into a pair of the sideband ones in Kerr microresonators with high-quality factors breaks the pump laser parameter space into a sequence of narrow in frequency...
Eigenvalue repulsions and quasinormal mode spectra of Kerr-Newman
The frequency spectra of the gravito-electromagnetic perturbations of the
Kerr-Newman (KN) black hole with the slowest decay rate have been computed
recently. It has been found that KN has two families $-$ the photon sphere...
Changes in perceived scientific consensus shift beliefs about climate change and GM food safety.
Despite an overwhelming scientific consensus, a sizable minority of people doubt that human activity is causing climate change. Communicating the existence of a scientific consensus has been suggested as a way to correct...
Two-Arm Randomized Pilot Intervention Trial to Decrease Sitting Time and Increase Sit-To-Stand Transitions in Working and Non-Working Older Adults.
Jacqueline Kerr, Michelle Takemoto, Khalisa Bolling, Andrew Atkin, Jordan Carlson, Dori Rosenberg, Katie Crist, Suneeta Godbole, Brittany Lewars, Claudia Pena, Gina Merchant
Jan 15, 2016
Pharmacological Preconditioning with GYKI 52466
Some toxins and drugs can trigger lasting neuroprotective mechanisms that enable neurons to resist a subsequent severe insult. This "pharmacological preconditioning" has far-reaching implications for conditions in which blood...
The Ursinus Weekly, December 10, 1917
Sophomore eleven defeats freshmen "The Merchant of Venice" Ursinus quintet loses to Penn Review of the 1917 football season Christian associations Vesper services Literary societies College directory On the campus ...
Ursinus College Collegeville Pennsylvania newspaper Raymond E. Wilhelm Football Basketball YMCA YWCA Zwinglian literary society Schaff literary society cultural history Higher Education Liberal Studies Social History United States History
Published by: Ursinus College
The Grizzly, April 22, 2004
Lauren A. Perotti, Lindsey Fund, Kyle Kauffman, Brandie Salenetri, Whitney Roper, Michael Castiglione, Kelly Gray, Johanna Nash, Brian Grzymkowski, Bart Brooks, Monica Delaney, Marie DiFeliciantonio, Bill Stiles, Eden Swick
Jan 01, 0001
A Booming Economy Gives Way to a Promising Job Outlook Spotlights on 2004 Salutatorians: Jacqueline Carrick and Quinn Dinsmore Politics in Action: Photo Essay Opinions: Business Degree = Job?; "Cool" Defined; Condoleeza Rice...
Ursinus College Collegeville Pennsylvania newspaper softball Erin Skinner baseball Tommy Herrmann Ryan Bown gospel choir Concert Band Dance Company Donald Trump theater Spring Fling Nicole Borocci John Kerry Jacqueline Carrick Quinn Dinsmore cultural history Higher Education Liberal Studies Social History United States History
Published by: Ursinus College
Soliton-plasmon resonances as Maxwell nonlinear bound states
We demonstrate that soliplasmons (soliton–plasmon bound states) appear naturally as eigenmodes of nonlinear Maxwell’s equations for a metal/Kerr interface. Conservative stability analysis is performed by means of finite element...
Diophantine approximation as Cosmic Censor for Kerr–AdS black holes
Abstract The purpose of this paper is to show an unexpected connection between Diophantine approximation and the behavior of waves on black hole interiors with negative cosmological constant...
Christoph Kehle
Feb 22, 2022
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