Browsing Astronomy and Astrophysics by Title
Now showing items 105-124 of 195
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Measuring the numerical viscosity in simulations of protoplanetary disks in Cartesian grids
(EDP Sciences, 2023-10)Context. Hydrodynamical simulations solve the governing equations on a discrete grid of space and time. This discretization causes numerical diffusion similar to a physical viscous diffusion, whose magnitude is often ... -
The Method of Images in Cosmology
We apply the method of images to the exact initial data for cosmological models that contain a number of regularly arranged discrete masses. This allows us to join cosmological regions together by throats, and to construct ... -
Migration of low-mass planets in inviscid discs: the effect of radiation transport on the dynamical corotation torque
(Oxford University Press (OUP), 2024-02-15)Low-mass planets migrate in the type-I regime. In the inviscid limit, the contrast between the vortensity trapped inside the planet’s corotating region and the background disc vortensity leads to a dynamical corotation ... -
Minimal distances between SCFTs
(2014-01-28) -
MISALIGNED DISKS IN THE BINARY PROTOSTAR IRS 43
(2016-10-10) -
Modified Gravity and Cosmology
In this review we present a thoroughly comprehensive survey of recent work on modified theories of gravity and their cosmological consequences. Amongst other things, we cover General Relativity, Scalar-Tensor, Einstein-Aether, ... -
Nekrasov-Shatashvili limit of the 5D superconformal index
(2016-08-08) -
Non-Gaussianity in multiple three-form field inflation
(2016-11-07) -
Observational Constraints on the Completeness of Space near Astrophysical Objects
We consider the observational effects of a deficit angle, w, in the topology of the solar system and in the 'double pulsar' system PSR J0737-3039A/B. Using observations of the perihelion precession of Mercury, and the ... -
Observational Cosmology in Macroscopic Gravity
We discuss the construction of cosmological models within the framework of Macroscopic Gravity (MG), which is a theory that models the effects of averaging the geometry of space-time on large scales. We find new exact ... -
On -symmetric Fixed Points and Superconformality
(2011-05) -
On Regular Hypergraphs of High Girth
(2014-03-10)We give lower bounds on the maximum possible girth of an r-uniform, d-regular hypergraph with at most n vertices, using the definition of a hypergraph cycle due to Berge. These differ from the trivial upper bound by an ... -
On the absence of the usual weak-field limit, and the impossibility of embedding some known solutions for isolated masses in cosmologies with f(R) dark energy
(2012-10-02)The problem of matching different regions of spacetime in order to construct inhomogeneous cosmological models is investigated in the context of Lagrangian theories of gravity constructed from general analytic functions ...