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Articles by Jadwin Hall
Kinematic Flow and the Emergence of Time
Perhaps the most basic question we can ask about cosmological correlations is how their strength changes as we smoothly vary kinematic parameters. The answer is encoded in differential equations that govern this evolution in kinematic space. In this Letter, we introduce a new perspective on these differential equations.
Measurements of the temperature and $E$-mode polarization of the cosmic microwave background from the full 500-square-degree SPTpol dataset
F. Bianchini27, L. E. Bleem5,2, J. E. Carlstrom2,6,5,1,7, C. L. Chang2,5,1, P. Chaubal28, H. C. Chiang29,30, R. Citron8, C. Corbett Moran31, T. M. Crawford2,1, A. T. Crites2,1,32,33, T. de Haan34,35,36, M. A. Dobbs29,37, D. Dutcher9, W. Everett10, J. Gallicchio2,11, E. M. George38,34, N. Gupta12, N. W. Halverson10,25, G. P. Holder39,40, W. L. Holzapfel34, J. D. Hrubes8, N. Huang34, J. Hubmayr4, K. D. Irwin27,41, L. Knox13, A. T. Lee34,35, D. Li4,27, A. Lowitz1,42, J. J. McMahon2,6,1, J. Montgomery29, T. Natoli1,2,14, J. P. Nibarger4, G. I.
Nonlinear Sigma model amplitudes to all loop orders are contained in the $\mathrm{Tr}({\mathrm{\ensuremath{\Phi}}}^{3})$ theory
Scattering amplitudes for the simplest theory of colored scalar particles—the Tr(Φ3) theory—have recently been the subject of active investigations. In this work we describe an unanticipated wider implication of this work: the Tr(Φ3) theory secretly contains nonlinear sigma model (NLSM) amplitudes to all loop orders. The NLSM amplitudes are obtained from Tr(Φ3) amplitudes by a unique shift of kinematic variables.
Nonlinear effects in black hole ringdown from scattering experiments: Spin and initial data dependence of quadratic mode coupling
Hengrui Zhu1,2,*, Justin L. Ripley3, Frans Pretorius1,2, Sizheng Ma4, Keefe Mitman5, Robert Owen6, Michael Boyle7, Yitian Chen7, Nils Deppe8,7, Lawrence E. Kidder7, Jordan Moxon5, Kyle C. Nelli5, Harald P. Pfeiffer9, Mark A. Scheel5, William Throwe7, and Nils L.
Challenges in quasinormal mode extraction: Perspectives from numerical solutions to the Teukolsky equation
The intricacies of black hole ringdown analysis are amplified by the absence of a complete set of orthogonal basis functions for quasinormal modes. Although damped sinusoids effectively fit the ringdown signals from binary black hole mergers, the risk of overfitting remains, due to initial transients and nonlinear effects.
Nonlinear evolution of quadratic gravity in $3+1$ dimensions
We present a numerically stable system of (3+1) evolution equations for the nonlinear gravitational dynamics of quadratic-curvature corrections to General Relativity (quadratic gravity). We also report on the numerical implementation of these evolution equations. We recover a well-known linear instability and gather evidence that—aside from said instability—quadratic gravity exhibits a physically stable Ricci-flat subsector.
Influence of stellar compactness on finite-temperature effects in neutron star merger simulations
Binary neutron star mergers probe the dense-matter equation of state (EoS) across a wide range of densities and temperatures, from the cold conditions of the inspiral to the high-temperature matter of the massive neutron star remnant. In this paper, we explore the sensitivity of neutron star mergers to uncertainties in the finite-temperature part of the EoS with a series of merger simulations performed in full general relativity.
Killing horizons decohere quantum superpositions
Abstract We recently showed that if a massive (or charged) body is put in a quantum spatial superposition, the mere presence of a black hole in its vicinity will eventually decohere the superposition. In this paper we show that, more generally, decoherence of stationary superpositions will occur in any spacetime with a Killing horizon.
Tidal deformability doppelg\"anger: Implications of a low-density phase transition in the neutron star equation of state
Abstract Studying the properties of ultradense matter is one of the key goals of modern neutron star research. The measurement of the tidal deformability from the inspiral of a binary neutron star merger offers one promising method for constraining the equation of state (EoS) of cold, dense matter.
Degeneracy in the Inference of Phase Transitions in the Neutron Star Equation of State from Gravitational Wave Data
Abstract Gravitational wave (GW) detections of binary neutron star inspirals will be crucial for constraining the dense matter equation of state (EOS). We demonstrate a new degeneracy in the mapping from tidal deformability data to the EOS, which occurs for models with strong phase transitions.
Instability of spherically symmetric black holes in quadratic gravity
Abstract We investigate the linear stability of the two known branches of spherically symmetric black holes in quadratic gravity. We extend previous work on the long-wavelength (Gregory-Laflamme) instability of the Schwarzschild branch to a corresponding long-wavelength instability in the non-Schwarzschild branch. In both cases, the instability sets in below a critical horizon radius at which the two black-hole branches intersect.
Characterizing the Breakdown of Quasi-universality in Postmerger Gravitational Waves from Binary Neutron Star Mergers
The advent of gravitational wave (GW) astronomy has opened an exciting new era for constraining the equation of state (EoS) of ultradense matter. Observations of the inspiral from the first binary neutron star merger, GW170817 (Abbott et al.
The Atacama Cosmology Telescope: DR4 maps and cosmological parameters
Author affiliations 1 Center for Computational Astrophysics, Flatiron Institute, 162 5th Avenue, New York, NY 10010, U.S.A. 2 Joseph Henry Laboratories of Physics, Jadwin Hall, Princeton University, Princeton, NJ 08544, U.S.A. 3 School of Physics and Astronomy, Cardiff University, The Parade, Cardiff, Wales, CF24 3AA, U.K. 4 Université Paris-Saclay, CNRS, Institut d'astrophysique spatiale, 91405, Orsay, France 5 Instituto de Astrofísica and Centro de Astro-Ingeniería, Facultad de Fìsica,...
The Atacama Cosmology Telescope: a measurement of the Cosmic Microwave Background power spectra at 98 and 150 GHz
Author affiliations 1 Department of Physics, Cornell University, Ithaca, NY 14853, U.S.A. 2 Department of Astronomy, Cornell University, Ithaca, NY 14853, U.S.A. 3 Joseph Henry Laboratories of Physics, Jadwin Hall, Princeton University, Princeton, NJ 08544, U.S.A. 4 Center for Computational Astrophysics, Flatiron Institute, 162 5th Avenue, New York, NY 10010, U.S.A. 5 Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802, U.S.A. 6 Institute for...
Collisions in outer space produced an icosahedral phase in the Khatyrka meteorite never observed previously in the laboratory
The discovery of an icosahedral Al-Cu-Fe quasicrystal with a composition far from that of any known ideal, stable quasicrystal is notable for several reasons. It is only the third example of a natural quasicrystal to be found anywhere, all from fragments of the same Khatyrka meteorite; and it is the first documented example of the coexistence of two different Al-Cu-Fe i-phase compositions.
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