scholarly journals Effective stress–energy tensors, self-force and broken symmetry

2010 ◽  
Vol 27 (13) ◽  
pp. 135002 ◽  
Author(s):  
Abraham I Harte
Keyword(s):  
Effective Stress ◽  
Broken Symmetry ◽  
Stress Energy ◽  
Self Force

Confining the scalar field of the Kaluza–Klein monopole

1986 ◽  
Vol 64 (5) ◽  
pp. 637-640 ◽  
Author(s):  
G. Kunstatter ◽  
D. Vincent
Keyword(s):  
Boundary Layer ◽  
Scalar Field ◽  
Effective Stress ◽  
Thin Boundary Layer ◽  
Stress Energy ◽  
Inherent Problem ◽  
Kaluza Klein

A discussion is given of the Kaluza–Klein monopole and the inherent problem associated with its scalar field. A model that achieves a confinement of this scalar field is presented, whereby a thin boundary layer is imposed on the monopole geometry allowing an exterior geometry with a constant scalar field to be attached. The Gauss–Codazzi formalism then puts strong constraints on the effective stress energy of the boundary.

Kerr–Newman black holes cannot be over-charged or over-spun

2018 ◽  
Vol 27 (11) ◽  
pp. 1843003 ◽  
Author(s):  
Robert M. Wald
Keyword(s):  
Black Hole ◽  
Energy Condition ◽  
Finite Size ◽  
Null Energy Condition ◽  
Second Order ◽  
Energy Tensor ◽  
Finite Size Effects ◽  
Stress Energy ◽  
Newman Black Hole ◽  
Self Force

I describe research done in collaboration with J. Sorce showing that one cannot over-charge and/or over-spin an initially slightly nonextremal Kerr–Newman black hole via the type of gedanken experiments proposed by Hubeny and others, assuming that the nonelectromagnetic stress-energy tensor of the matter entering the black hole satisfies the null energy condition. Analysis of such gedanken experiments requires that we calculate all effects on the final mass of the black hole that are second-order in the charge and the angular momentum carried into the black hole. We do so using Lagrangian methods, and our formula for the second-order correction to mass, [Formula: see text], is obtained by generalizing the canonical energy analysis of Hollands and Wald to the Einstein–Maxwell case. Our formula for [Formula: see text] automatically includes all self-force and finite size effects.

Broken symmetry and magnetoacoustic effects in ferroand antiferromagnetics

1983 ◽  
Vol 140 (7) ◽  
pp. 429 ◽  
Author(s):  
Evgenii A. Turov ◽  
Vladimir G. Shavrov
Keyword(s):  
Broken Symmetry
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