Zobrazeno 1 - 10
of 163
pro vyhledávání: '"David Garfinkle"'
Publikováno v:
Physics Letters B, Vol 843, Iss , Pp 138028- (2023)
We present first results from a novel numerical relativity code based on a tetrad formulation of the Einstein-scalar field equations combined with recently introduced gauge/frame invariant diagnostics. The results provide support for the argument tha
Externí odkaz:
https://doaj.org/article/da30fbfc6c20415fb380ec144e636b24
Autor:
David Garfinkle
Publikováno v:
Fafnir, Vol 5, Iss 2, Pp 15-22 (2018)
This case study considers popular examples of science fiction in film and on television for classroom instruction at the junior undergraduate level of coursework. Drawing on the familiarity of Star Trek in popular culture, this study uses episodes fr
Externí odkaz:
https://doaj.org/article/2fbf7246dcaf421f9300f47c43acd01d
Autor:
Lawrence R. Mead, David Garfinkle
Publikováno v:
AIP Advances, Vol 7, Iss 8, Pp 085001-085001-7 (2017)
Carl Bender and collaborators have developed a quantum theory governed by Hamiltonians that are PT-symmetric rather than Hermitian. To implement this theory, the inner product was redefined to guarantee positive norms of eigenstates of the Hamiltonia
Externí odkaz:
https://doaj.org/article/0c85684ab04b4f819a10d01a9d84d2b2
Autor:
David Garfinkle, Richard Garfinkle
If scientists can't touch the Sun, how do they know what it's made of? And if we can't see black holes, how can we be confident they exist? Gravitational physicist David Garfinkle and his brother, science fiction writer Richard Garfinkle, tackle the
Ricci fall-off in static and stationary non-singular spacetimes, revisited: the null geodesic method
Autor:
David Garfinkle, Stacey G. Harris
Publikováno v:
General Relativity and Gravitation. 55
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5b2499caa2373efdba87952454c60a37
https://doi.org/10.1007/s10714-023-03064-0
https://doi.org/10.1007/s10714-023-03064-0
Publikováno v:
Nonlinearity. 34:6539-6560
We present a numerical study of the local stability of mean curvature flow of rotationally symmetric, complete noncompact hypersurfaces with Type-II curvature blowup. Our numerical analysis employs a novel overlap method that constructs "numerically
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5bf1c49853d320e26d16bb4b4451d7e1
https://doi.org/10.1088/1361-6544/ac15a9
https://doi.org/10.1088/1361-6544/ac15a9
Publikováno v:
Physical Review D. 105
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a2463269ba4b04c8e0801ce20346789f
https://doi.org/10.1103/physrevd.105.123022
https://doi.org/10.1103/physrevd.105.123022
In previous work [GIKW21], we have presented evidence from numerical simulations that the Type-II singularities of mean curvature flow (MCF) of rotationally-symmetric, complete, noncompact embedded hypersurfaces constructed in [IW19, IWZ21] are stabl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8774099b45e071ff69b9e98c67f59931
http://arxiv.org/abs/2206.01890
http://arxiv.org/abs/2206.01890
Autor:
David Garfinkle
Gravitational wave memory and its electromagnetic analog are shown to be straightforward consequences of the wave equation. From Maxwell's equations one can derive a wave equation for the electric field, while from the Bianchi identity one can derive
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::99505b5be6feb7bac3aa814ed402c5a5
http://arxiv.org/abs/2201.05543
http://arxiv.org/abs/2201.05543
In this paper, a non-trivial system governed by a continuum PT-symmetric Hamiltonian is discussed. We show that this Hamiltonian is iso-spectral to the simple harmonic oscillator. We find its eigenfunctions and the path in the complex plane along whi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6085df6aa946abd05f57fbc39a0d9b9b