46 citations · 181 across the 10 of their papers we have counts for
8 papers · 1 filter
Quantum Bias Cosmology: Acceleration from Holographic Information Capacity
Luke M. Butcher
I show that a generic quantum phenomenon can drive cosmic acceleration without the need for dark energy or modified gravity. When treating the universe as a quantum system, one typ…
Lambda does not Lens: Deflection of Light in the Schwarzschild-de Sitter Spacetime
Luke M. Butcher
Debate persists as to whether the cosmological constant can directly modify the power of a gravitational lens. With the aim of reestablishing a consensus on this issue, I condu…
Traversable Wormholes and Classical Scalar Fields
Luke M. Butcher
I prove that general relativity admits no asymptotically well-behaved static spherically symmetric traversable wormholes supported by classical scalar fields and nonexotic matter.…
Casimir Energy of a Long Wormhole Throat
Luke M. Butcher
We calculate the Casimir energy-momentum tensor induced in a scalar field by a macroscopic ultrastatic spherically-symmetric long-throated traversable wormhole, and examine whether…
Localized Energetics of Linear Gravity: Theoretical Development
Luke M. Butcher, Michael Hobson, Anthony Lasenby
We recently developed a local description of the energy, momentum and angular momentum carried by the linearized gravitational field, wherein the gravitational energy-momentum tens…
Localizing the Angular Momentum of Linear Gravity
Luke M. Butcher, Anthony Lasenby, Michael Hobson
In a previous article [Phys. Rev. D 82 104040 (2010)], we derived an energy-momentum tensor for linear gravity that exhibited positive energy density and causal energy flux. Here w…
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…
The physical significance of the Babak-Grishchuk gravitational energy-momentum tensor
Luke M. Butcher, Anthony Lasenby, Michael Hobson
We examine the claim of Babak and Grishchuk [1] to have solved the problem of localising the energy and momentum of the gravitational field. After summarising Grishchuk's flat-spac…