Toby Wiseman

May 16, 2024 | thenakedscientists.com | Toby Wiseman |Chris Smith

Or could they all just be a human construct? Interview with Toby Wiseman, Imperial College LondonALIENFor this question of the week, James Tytko was tasked with finding an answer to Daniel's question on the human understanding of the universe. Luckily, cosmologist Toby Wiseman from Imperial College London was on hand to help... Toby - Does physics change as we move around the universe? One of the fundamental tenets of cosmology is in fact that we don't live in a special location.

Jan 19, 2024 | link.aps.org | Matthew Roberts |Toby Wiseman |Blackett Laboratory

We consider the nearest-neighbor lattice tight-binding model of graphene with slowly spatially varying hopping functions. We develop a systematic low-energy approximation as a derivative expansion in a Dirac spinor field that is perturbative in the strength of the hopping function deformation. The well-known leading description in both the derivative and perturbative expansions is the Dirac equation in flat 2+1-dimensional spacetime with magnetic (strain-)gauge field.

Oct 25, 2023 | todayschronic.com | Shen Ridenbaugh |Toby Wiseman

Astronomers have long assumed that two black holes that circle close to each other are always destined to become one in a cataclysmic merger that spans eons. That needn't always be the case, new research finds. In a new study, physicists found that it is theoretically possible for two black holes to remain at a fixed distance from each other, thanks to their mutual gravitational pull being perfectly counterbalanced by the speed at which the universe is expanding.

Oct 25, 2023 | link.aps.org | Claudia de Rham |Blackett Laboratory |Andrew J. Tolley |Toby Wiseman

We present a formulation of ghost-free massive gravity with flat reference metric that exhibits the full nonlinear constraint algebraically, in a way that can be directly implemented for numerical simulations. Motivated by the presence of higher order operators in the low-energy effective description of massive gravity, we show how the inclusion of higher-order gradient (dissipative) terms leads to a well-posed formulation of its dynamics.

Sep 25, 2023 | physics.aps.org | Toby Wiseman

September 25, 2023• Physics 16, 164Black holes may be less unique than previously thought, as the expansion due to a cosmological constant can hold apart a pair of holes and allow them to mimic a single black hole. ×Black holes are astonishing objects that can pack the mass of Earth into a space the size of a pea. A remarkable attribute is their stunning simplicity, which is encapsulated in the celebrated uniqueness theorems [1].