WorldCat Identities

Macdonald, Douglas A. (Douglas Alan)

Overview
Works: 7 works in 18 publications in 2 languages and 546 library holdings
Genres: Academic theses 
Roles: Author
Publication Timeline
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Most widely held works by Douglas A Macdonald
Black holes : the membrane paradigm by Kip S Thorne( Book )

12 editions published between 1986 and 1988 in English and Russian and held by 539 WorldCat member libraries worldwide

A pedagogical introduction to the physics of black holes. The membrane paradigm represents the four-dimensional spacetime of the black hole's "event horizon" as a two-dimensional membrane in three-dimensional space, allowing the reader to understand and compute the behavior of black holes in complex astrophysical environments
Black-hole electrodynamics by Douglas A Macdonald( )

1 edition published in 1984 in English and held by 2 WorldCat member libraries worldwide

Chernye dyry : membrannyĭ podkhod( Book )

1 edition published in 1988 in Russian and held by 2 WorldCat member libraries worldwide

Black-Hole Electrodynamics by Douglas A Macdonald( Book )

1 edition published in 1984 in Undetermined and held by 1 WorldCat member library worldwide

<p>This dissertation considers several aspects of the structure and dynamics of electromagnetic fields around black holes. The four-dimensional, covariant laws of electrodynamics are reformulated in a 3 + 1 (space+time) language in which the key quantities are three-dimensional vectors lying in hypersurfaces of a constant global time <i>t</i>. This formulation is applied to the Blandford-Znajek model of power generation in quasars, which consists of a supermassive black hole surrounded by an accretion disk that holds a magnetic field on the hole, with the rotational energy and angular momentum of the hole and disk being extracted by electromagnetic torques. The 3 + 1 formalism allows the theory of stationary, axisymmetric black holes and their magnetospheres to be couched in an "absolute-space/universal-time" language very similar to the flat­ spacetime theory of pulsar electrodynamics; and this similarity allows fiat-space pulsar concepts to be extended to curved-space black holes. The Blandford­-Znajek quasar model is reformulated in terms of a DC circuit-theory analysis, and action principles describing the overall structure of the magnetosphere and the field distribution on the horizon are developed. A general prescription for constructing global models of force-free magnetospheres is developed and this prescription is used to generate numerical models of black-hole magneto­spheres for a variety of field configurations and black-hole angular velocities. The electromagnetic boundary conditions at the horizon of a black hole are described in terms of a recently developed "membrane viewpoint". The necess­ity and efficacy of using a "stretched horizon" in the membrane viewpoint is discussed, and is illustrated by two simple dynamical problems involving electromagnetic fields near black-hole horizons.</p>
Black-Hole Electrodynamics by Douglas A Macdonald( )

1 edition published in 1984 in Undetermined and held by 1 WorldCat member library worldwide

<p>This dissertation considers several aspects of the structure and dynamics of electromagnetic fields around black holes. The four-dimensional, covariant laws of electrodynamics are reformulated in a 3 + 1 (space+time) language in which the key quantities are three-dimensional vectors lying in hypersurfaces of a constant global time <i>t</i>. This formulation is applied to the Blandford-Znajek model of power generation in quasars, which consists of a supermassive black hole surrounded by an accretion disk that holds a magnetic field on the hole, with the rotational energy and angular momentum of the hole and disk being extracted by electromagnetic torques. The 3 + 1 formalism allows the theory of stationary, axisymmetric black holes and their magnetospheres to be couched in an "absolute-space/universal-time" language very similar to the flat­ spacetime theory of pulsar electrodynamics; and this similarity allows fiat-space pulsar concepts to be extended to curved-space black holes. The Blandford­-Znajek quasar model is reformulated in terms of a DC circuit-theory analysis, and action principles describing the overall structure of the magnetosphere and the field distribution on the horizon are developed. A general prescription for constructing global models of force-free magnetospheres is developed and this prescription is used to generate numerical models of black-hole magneto­spheres for a variety of field configurations and black-hole angular velocities. The electromagnetic boundary conditions at the horizon of a black hole are described in terms of a recently developed "membrane viewpoint". The necess­ity and efficacy of using a "stretched horizon" in the membrane viewpoint is discussed, and is illustrated by two simple dynamical problems involving electromagnetic fields near black-hole horizons.</p>
Černye dyry : membrannyj podhod( Book )

1 edition published in 1988 in Russian and held by 1 WorldCat member library worldwide

Morality and the criminal law : an examination of some recent attempts to define theoretical limits to the proper scope of the criminal law by Douglas A Macdonald( )

1 edition published in 1972 in English and held by 0 WorldCat member libraries worldwide

 
Audience Level
0
Audience Level
1
  Kids General Special  
Audience level: 0.47 (from 0.47 for Black hole ... to 1.00 for Morality a ...)

Black holes : the membrane paradigm
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Alternative Names
Macdonald, Douglas A.

Makdonald, D.

Makdonald, Douglas.

Makdonald, Duglas A.

Макдоналд, Дуглас А.

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