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- Institute of AstronomyRU180 papers
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64 papers · 1 filter
First-order adiabatic perturbations of a perfect fluid about a general FLRW background using the 1+3 covariant and gauge-invariant formalism
Sylvain D. Brechet, Michael P. Hobson, Anthony N. Lasenby
An analysis of adiabatic perturbations of a perfect fluid is performed to first-order about a general FLRW background using the 1+3 covariant and gauge-invariant formalism. The ana…
On the dynamics of exotic matter: towards creation of Perpetuum Mobile of third kind
Pavel Ivanov
The one-dimensional dynamics of a classical ideal 'exotic' fluid with equation of state violating the weak energy condition is discussed. Under certain assumptions it…
Gravitating Opposites Attract
Robert Beig, Gary W. Gibbons, Richard M. Schoen
Generalizing previous work by two of us, we prove the non-existence of certain stationary configurations in General Relativity having a spatial reflection symmetry across a non-com…
Global embedding of the Kerr black hole event horizon into hyperbolic 3-space
G. W. Gibbons, C. A. R. Herdeiro, C. Rebelo
An explicit global and unique isometric embedding into hyperbolic 3-space, H^3, of an axi-symmetric 2-surface with Gaussian curvature bounded below is given. In particular, this al…
Investigating Dark Energy with Black Hole Binaries
Laura Mersini-Houghton, Adam Kelleher
The accelerated expansion of the universe is ascribed to the existence of dark energy. Black holes accretion of dark energy induces a mass change proportional to the energy density…
Bootstrapping gravity: a consistent approach to energy-momentum self-coupling
Luke M. Butcher, Michael Hobson, Anthony Lasenby
It is generally believed that coupling the graviton (a classical Fierz-Pauli massless spin-2 field) to its own energy-momentum tensor successfully recreates the dynamics of the Ein…