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Papers by Nigel Bishop

Research paper thumbnail of General Relativity and Gravitation

Processes for the anionic polymerization of lactam accelerated by the presence of nitrothiophene ... more Processes for the anionic polymerization of lactam accelerated by the presence of nitrothiophene and certain derivatives thereof. The processes are especially applicable to the preparation of poly-2-pyrrolidone which can be molded into filaments, films, and shaped articles in general.

Research paper thumbnail of Effect of a low density dust shell on the propagation of gravitational waves

General Relativity and Gravitation, Sep 1, 2020

Research paper thumbnail of Time-varying Newtonian gravity and universal motion

Research paper thumbnail of Equivalence principle: 60 years of a misuse?

Research paper thumbnail of The thermodynamics of a system containing two black holes and black-body radiation

General Relativity and Gravitation, Nov 1, 1987

Research paper thumbnail of Proceedings of the 16th International Conference on General Relativity & Gravitation : Durban, South Africa, 15-21 July 2001

WORLD SCIENTIFIC eBooks, 2002

Research paper thumbnail of Effect of a viscous fluid shell on the propagation of gravitational waves

arXiv (Cornell University), Jun 30, 2022

Research paper thumbnail of Towards the geometry of the Universe from data

Monthly Notices of the Royal Astronomical Society, Sep 1, 2015

Research paper thumbnail of A Principle of Impotence Allowing for Newtonian Cosmologies with a time-Dependent Gravitational Constant

Monthly Notices of the Royal Astronomical Society, May 1, 1975

Research paper thumbnail of Gravitational waves in a de Sitter universe

Physical review, Feb 18, 2016

Research paper thumbnail of Matter shells modifying gravitational wave signals

The Sixteenth Marcel Grossmann Meeting, Jan 24, 2023

Research paper thumbnail of Developments in numerical relativity and gravitational wave observations

The Sixteenth Marcel Grossmann Meeting, Jan 24, 2023

Research paper thumbnail of Numerically reconstructing the geometry of the Universe from data

arXiv (Cornell University), Jan 27, 2016

Research paper thumbnail of A Comment on Dirac Large Number Hypothesis Cosmology

The Astrophysical Journal, Feb 1, 1985

ABSTRACT Results on Dirac cosmology presented in a recent paper by Julg (1983) are criticized.

Research paper thumbnail of Cosmology and a General Scalar-Tensor Theory of Gravity

Monthly Notices of the Royal Astronomical Society, Aug 1, 1976

Research paper thumbnail of Observational cosmology using characteristic numerical relativity: Characteristic formalism on null geodesics

Physical review, Feb 7, 2012

Research paper thumbnail of Observational Cosmology and Numerical Relativity

Quaestiones Mathematicae, Apr 1, 1996

This paper brings together the theory of observational cosmology and the null-cone characteristic... more This paper brings together the theory of observational cosmology and the null-cone characteristic initial value problem (CIVP) of numerical relativity. A computer code is constructed which calculates the past behaviour of the Universe from input data that is, in principle, measurable. For practical reasons the code is limited to the case of axisymmetry without rotation. The construction of the code brings to light an interesting general point about observational cosmology. In a big-bang universe it is impossible, even in principle, to determine the state of the universe at early times. For the Einstein-de Sitter model this limit is t0/27, where t0 means now.

Research paper thumbnail of Kerr metric in Bondi-Sachs form

Physical review, Apr 21, 2006

Research paper thumbnail of Characterizing early drug resistance-related events using geometric ensembles from HIV protease dynamics

Scientific Reports, Dec 18, 2018

Research paper thumbnail of Some aspects of the characteristic initial value problem in numerical relativity

Cambridge University Press eBooks, Dec 10, 1992

ABSTRACT This paper is concerned with the axisymmetric characteristic initial value problem (CIVP... more ABSTRACT This paper is concerned with the axisymmetric characteristic initial value problem (CIVP). Tests on the accuracy and evolution stability of the code are described. The results compare reasonably well with expectations from numerical analysis. It is shown explicitly how to compactify CIVP coordinates so that a finite grid extends to future null infinity. The author also investigates the feasibility of interfacing Cauchy algorithms in a central region with CIVP algorithms in the external vacuum.

Research paper thumbnail of General Relativity and Gravitation

Processes for the anionic polymerization of lactam accelerated by the presence of nitrothiophene ... more Processes for the anionic polymerization of lactam accelerated by the presence of nitrothiophene and certain derivatives thereof. The processes are especially applicable to the preparation of poly-2-pyrrolidone which can be molded into filaments, films, and shaped articles in general.

Research paper thumbnail of Effect of a low density dust shell on the propagation of gravitational waves

General Relativity and Gravitation, Sep 1, 2020

Research paper thumbnail of Time-varying Newtonian gravity and universal motion

Research paper thumbnail of Equivalence principle: 60 years of a misuse?

Research paper thumbnail of The thermodynamics of a system containing two black holes and black-body radiation

General Relativity and Gravitation, Nov 1, 1987

Research paper thumbnail of Proceedings of the 16th International Conference on General Relativity & Gravitation : Durban, South Africa, 15-21 July 2001

WORLD SCIENTIFIC eBooks, 2002

Research paper thumbnail of Effect of a viscous fluid shell on the propagation of gravitational waves

arXiv (Cornell University), Jun 30, 2022

Research paper thumbnail of Towards the geometry of the Universe from data

Monthly Notices of the Royal Astronomical Society, Sep 1, 2015

Research paper thumbnail of A Principle of Impotence Allowing for Newtonian Cosmologies with a time-Dependent Gravitational Constant

Monthly Notices of the Royal Astronomical Society, May 1, 1975

Research paper thumbnail of Gravitational waves in a de Sitter universe

Physical review, Feb 18, 2016

Research paper thumbnail of Matter shells modifying gravitational wave signals

The Sixteenth Marcel Grossmann Meeting, Jan 24, 2023

Research paper thumbnail of Developments in numerical relativity and gravitational wave observations

The Sixteenth Marcel Grossmann Meeting, Jan 24, 2023

Research paper thumbnail of Numerically reconstructing the geometry of the Universe from data

arXiv (Cornell University), Jan 27, 2016

Research paper thumbnail of A Comment on Dirac Large Number Hypothesis Cosmology

The Astrophysical Journal, Feb 1, 1985

ABSTRACT Results on Dirac cosmology presented in a recent paper by Julg (1983) are criticized.

Research paper thumbnail of Cosmology and a General Scalar-Tensor Theory of Gravity

Monthly Notices of the Royal Astronomical Society, Aug 1, 1976

Research paper thumbnail of Observational cosmology using characteristic numerical relativity: Characteristic formalism on null geodesics

Physical review, Feb 7, 2012

Research paper thumbnail of Observational Cosmology and Numerical Relativity

Quaestiones Mathematicae, Apr 1, 1996

This paper brings together the theory of observational cosmology and the null-cone characteristic... more This paper brings together the theory of observational cosmology and the null-cone characteristic initial value problem (CIVP) of numerical relativity. A computer code is constructed which calculates the past behaviour of the Universe from input data that is, in principle, measurable. For practical reasons the code is limited to the case of axisymmetry without rotation. The construction of the code brings to light an interesting general point about observational cosmology. In a big-bang universe it is impossible, even in principle, to determine the state of the universe at early times. For the Einstein-de Sitter model this limit is t0/27, where t0 means now.

Research paper thumbnail of Kerr metric in Bondi-Sachs form

Physical review, Apr 21, 2006

Research paper thumbnail of Characterizing early drug resistance-related events using geometric ensembles from HIV protease dynamics

Scientific Reports, Dec 18, 2018

Research paper thumbnail of Some aspects of the characteristic initial value problem in numerical relativity

Cambridge University Press eBooks, Dec 10, 1992

ABSTRACT This paper is concerned with the axisymmetric characteristic initial value problem (CIVP... more ABSTRACT This paper is concerned with the axisymmetric characteristic initial value problem (CIVP). Tests on the accuracy and evolution stability of the code are described. The results compare reasonably well with expectations from numerical analysis. It is shown explicitly how to compactify CIVP coordinates so that a finite grid extends to future null infinity. The author also investigates the feasibility of interfacing Cauchy algorithms in a central region with CIVP algorithms in the external vacuum.

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