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Results: 15079
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...
On the appearance of nitrite anion in [PdX(OAc)L<sub>2</sub>] and [Pd(X)(C∧N)L] syntheses (X = OAc or NO<sub>2</sub>)
S E Bajwa, T E Storr, Lauren E Hatcher, T J Williams, C G Baumann, A C Whitwood, D R Allan, S J Teat, Paul R Raithby, I J S Fairlamb
May 01, 2012
Pd 3(OAc) 5NO 2, an impurity in "Pd(OAc) 2" {formally Pd 3(OAc) 6}, emerges as a serious issue in the synthesis of pure Pd II complexes derived from Pd(OAc) 2, for example in our C-H activation precatalyst, Pd(OAc) 2(pip) 2 (pip...
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...
Bridging pre-surgical endocrine therapy for breast cancer during the COVID-19 pandemic
Rajiv V Dave, Beatrix Elsberger, Vicky P Taxiarchi, Ashu Gandhi, Cliona C Kirwan, Baek Kim, Elizabeth M Camacho, Charlotte E Coles, Ellen Copson, Alona Courtney, Kieran Horgan, Patricia Fairbrother, Chris Holcombe, Jamie J Kirkham, Daniel R Leff, Stuart A McIntosh, Rachel O'Connell, Ricardo Pardo, Shelley Potter, Tim Rattay, Nisha Sharma, Raghavan Vidya, Ramsey I Cutress, B-MaP-C study collaborative
Apr 17, 2023
PURPOSE: The B-MaP-C study investigated changes to breast cancer care that were necessitated by the COVID-19 pandemic. Here we present a follow-up analysis of those patients commenced on bridging endocrine therapy (BrET), whilst...
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...
The Integrity and Yield of Genomic DNA Isolated from Whole Blood Following Long-Term Storage at -30°C.
Wenlong Carl Chen, Robyn Kerr, Andrew May, Babongile Ndlovu, Anelisa Sobalisa, Sanelisiwe T Duze, Lavania Joseph, Christopher G Mathew, Chantal Babb de Villiers
Jun 25, 2018
Long-term storage of whole blood can affect the integrity of DNA if it is not done under optimal conditions. The aim of this study was to determine whether long-term storage (2-19 years) of whole blood samples at -30°C had a...
On the appearance of nitrite anion in [PdX(OAc)L<sub>2</sub>] and [Pd(X)(C∧N)L] syntheses (X = OAc or NO<sub>2</sub>)
S E Bajwa, T E Storr, Lauren E Hatcher, T J Williams, C G Baumann, A C Whitwood, D R Allan, S J Teat, Paul R Raithby, I J S Fairlamb
May 01, 2012
Pd 3(OAc) 5NO 2, an impurity in "Pd(OAc) 2" {formally Pd 3(OAc) 6}, emerges as a serious issue in the synthesis of pure Pd II complexes derived from Pd(OAc) 2, for example in our C-H activation precatalyst, Pd(OAc) 2(pip) 2 (pip...
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...
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...
An exploration into the visual aspects of roadmaps
Roadmapping is an established and popular method for strategic planning. Its strength is often characterised in terms of the visual way in which it can embody future plans and present pathways to realising an organisation's...
Circulating vitamin C and digestive system cancers
Susanna C Larsson, Amy M Mason, Mathew Vithayathil, Paul Carter, Siddhartha Kar, Ju-Sheng Zheng, Stephen Burgess
Sep 20, 2022
BACKGROUND & AIMS: Vitamin C is an antioxidant with a potential role in the prevention of digestive system cancers, but there is yet no consensus whether vitamin C has a causal role in these cancers. The aim of this study was to...
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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