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Uniqueness of the Kerr-de Sitter spacetime as an algebraically special solution in five dimensions
(SpringerCommunications in Mathematical Physics, 2015-08-20)
We determine the most general solution of the five-dimensional vacuum Einstein equation, allowing for a cosmological constant, with (i) a Weyl tensor that is type II or more special in the classification of Coley et al., ...
Vortex-ring-induced stratified mixing
(Cambridge University PressJournal of Fluid Mechanics, 2015-09-16)
There is tantalizing evidence that some mechanically driven stratified flows tend towards a state of constant mixing efficiency. We provide insight into the energy balance leading to the constant mixing efficiency and ...
Quantum Conditional Mutual Information, Reconstructed States, and State Redistribution
(APSPhysical Review Letters, 2015-06-29)
We give two strengthenings of an inequality for the quantum conditional mutual information of a tripartite quantum state recently proved by Fawzi and Renner, connecting it with the ability to reconstruct the state from its ...
On the Einstein-Weyl and conformal self-duality equations
(AIP PublishingJournal of Mathematical Physics, 2015-08-03)
The equations governing anti-self-dual and Einstein-Weyl conformal geometries
can be regarded as ‘master dispersionless systems’ in four and three dimensions
respectively. Their integrability by twistor methods has been ...
Superadditivity of private information for any number of uses of the channel
(APSPhysical Review Letters, 2015-07-20)
The quantum capacity of a quantum channel is always smaller than the capacity of the channel for private communication. Both quantities are given by the infinite regularization of the coherent and the private information, ...
Dynamical analysis in scalar field cosmology
(APSPhysical Review D, 2015-06-23)
We give a general method to find exact cosmological solutions for scalar-field dark energy in the presence of perfect fluids. We use the existence of invariant transformations for the Wheeler De Witt (WdW) equation. We ...
Local varying-alpha theories
(World Scientific PublishingModern Physics Letters A, 2015-07-20)
In a recent paper, we demonstrated how the simplest model for varying-alpha may be interpreted as the effect of a dielectric material, generalized to be consistent with Lorentz invariance. Unlike normal dielectrics, such ...
Multi-timescale analysis of phase transitions in precessing black-hole binaries
(American Physical SocietyPhysical Review D, 2015)
The dynamics of precessing binary black holes (BBHs) in the post-Newtonian regime has a strong timescale hierarchy: the orbital timescale is very short compared to the spin-precession timescale which, in turn, is much ...