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23 papers · 1 filter
Center of mass in special and general relativity and its role in an effective description of spacetime
C. Chryssomalakos, H. Hernandez-Coronado, E. Okon
In this contribution, we suggest the approach that geometric concepts ought to be defined in terms of physical operations involving quantum matter. In this way it is expected that…
Rigid motion revisited: rigid quasilocal frames
Richard J. Epp, Robert B. Mann, Paul L. McGrath
We introduce the notion of a rigid quasilocal frame (RQF) as a geometrically natural way to define a "system" in general relativity. An RQF is defined as a two-parameter family of…
Observer Dependent Horizon Temperatures: a Coordinate-Free Formulation of Hawking Radiation as Tunneling
Sean Stotyn, Kristin Schleich, Don Witt
We reformulate the Hamilton-Jacobi tunneling method for calculating Hawking radiation in static, spherically-symmetric spacetimes by explicitly incorporating a preferred family of…
A Class of Anisotropic Five-Dimensional Solutions for the Early Universe
J. Ponce de Leon, P. S. Wesson
We solve the Ricci-flat equations of extended general relativity to obtain an interesting class of cosmological models. The solutions are analogous to the 4D ones of Bianchi type-I…
Conserved Topological Defects in Non-Embedded Graphs in Quantum Gravity
Fotini Markopoulou, Isabeau Prémont-Schwarz
We follow up on previous work which found that commonly used graph evolution moves lead to conserved quantities that can be expressed in terms of the braiding of the graph in its e…
Dirichlet boundary value problem for Chern-Simons modified gravity
D. Grumiller, R. Mann, R. McNees
Chern-Simons modified gravity comprises the Einstein-Hilbert action and a higher-derivative interaction containing the Chern-Pontryagin density. We derive the analog of the Gibbons…