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pro vyhledávání: '"Robert F. Penna"'
Autor:
Robert F. Penna
Publikováno v:
Journal of High Energy Physics, Vol 2021, Iss 9, Pp 1-22 (2021)
Abstract Many integrable systems can be reformulated as holomorphic vector bundles on twistor space. This is a powerful organizing principle in the theory of integrable systems. One shortcoming is that it is formulated at the level of the equations o
Externí odkaz:
https://doaj.org/article/dd92312492d8487e8ccf1fa179e6d15f
Autor:
Robert F. Penna, Claire Zukowski
Publikováno v:
Journal of High Energy Physics, Vol 2019, Iss 7, Pp 1-25 (2019)
Abstract Kinematic space has been defined as the space of codimension-2 spacelike extremal surfaces in anti de Sitter (AdS d+1) spacetime which, by the Ryu-Takayanagi proposal, compute the entanglement entropy of spheres in the boundary CFT d . It ha
Externí odkaz:
https://doaj.org/article/78057dd8461e461cba4947c698e2b5b3
Publikováno v:
Journal of High Energy Physics, Vol 2019, Iss 2, Pp 1-16 (2019)
Abstract The asymptotic symmetry group of three-dimensional (anti) de Sitter space with Brown-Henneaux boundary conditions is the two dimensional conformal group with central charge c = 3ℓ/2G. Usually the asymptotic charge algebra is derived using
Externí odkaz:
https://doaj.org/article/307830a5b0814bdbbfa352599ea4dbcf
Autor:
Robert F. Penna
Publikováno v:
Journal of High Energy Physics, Vol 2017, Iss 10, Pp 1-18 (2017)
Abstract The Bondi-van der Burg-Metzner-Sachs (BMS) group is the asymptotic symmetry group of asymptotically flat gravity. Recently, Donnay et al. have derived an analogous symmetry group acting on black hole event horizons. For a certain choice of b
Externí odkaz:
https://doaj.org/article/7a4bc0c7960c49739b4b70f635900cdc
Autor:
Robert F. Penna
Under the action of the Geroch group, the Minkowski metric can be transformed into any vacuum metric with two commuting Killing vectors. In principle, this reduces the problem of deriving vacuum metrics with two commuting Killing vectors to pure alge
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4882e3dd3c83e3465427e815a3d83736
Autor:
Robert F. Penna
Publikováno v:
Physics. 12
Autor:
Robert F. Penna
Publikováno v:
Journal of Mathematical Physics. 61:012301
The group of area preserving diffeomorphisms of the two sphere, SDiff(S2), is one of the simplest examples of an infinite dimensional Lie group. It plays a key role in incompressible hydrodynamics and it recently appeared in general relativity as a s
Publikováno v:
Physical Review D. 96
In previous work, we developed tools for quantifying the tidal distortion of a black hole's event horizon due to an orbiting companion. These tools use techniques which require large mass ratios (companion mass $\ensuremath{\mu}$ much smaller than bl
Autor:
Robert F. Penna
We revisit the boundary dynamics of asymptotically flat, three dimensional gravity. The boundary is governed by a momentum conservation equation and an energy conservation equation, which we interpret as fluid equations, following the membrane paradi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4885bf702aaa9a3b0071bc22df45b7e1
http://arxiv.org/abs/1708.08470
http://arxiv.org/abs/1708.08470
Autor:
Hrant Gharibyan, Jon Losh, Sruthi Narayanan, Victor Buza, J. Villasenor, Eben Kunz, Michael Matejek, Qinxuan Pan, Richard F. Bradley, Meng Su, M. Valdez, Matthew R. Dexter, Haoxuan Zheng, Scott Morrison, Courtney M. Peterson, A. Lutomirski, R. P. Armstrong, Abraham R. Neben, Kevin Zheng, Hung-I Yang, Robert F. Penna, Katelin Schutz, Nevada J. Sanchez, Y. Zhu, Devon Rosner, Jack Hickish, Aaron Ewall-Wice, Eric R. Morgan, Joshua S. Dillon, Alessio Magro, Ashley Perko, Max Tegmark, S. M. Tribiano, Ioana Zelko, Adrian Liu, Christopher L. Williams, K. Zarb Adami
Publikováno v:
arXiv
We report on the MIT Epoch of Reionization (MITEoR) experiment, a pathfinder low-frequency radio interferometer whose goal is to test technologies that improve the calibration precision and reduce the cost of the high-sensitivity 3D mapping required