Browsing Astronomy and Astrophysics by Title
Now showing items 71-90 of 195
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H 2 S in the L1157-B1 bow shock
(Oxford University Press (OUP), 2016-11-21) -
Habitable worlds around M dwarf stars: The CAPSCam astrometric planet search
(2012-01-01)M dwarf stars are attractive targets in the search for habitable worlds as a result of their relative abundance and proximity, making them likely targets for future direct detection efforts. Hot super-Earths as well as gas ... -
Higher Powers in Gravitation
We consider the Friedmann-Robertson-Walker cosmologies of theories of gravity that generalise the Einstein-Hilbert action by replacing the Ricci scalar, R, with some function, f(R). The general asymptotic behaviour of these ... -
A Hot Saturn Orbiting an Oscillating Late Subgiant Discovered by TESS
(American Astronomical Society, 2019-05-30)© 2019. The American Astronomical Society. All rights reserved.. We present the discovery of HD 221416 b, the first transiting planet identified by the Transiting Exoplanet Survey Satellite (TESS) for which asteroseismology ... -
Hubble Diagram Dispersion From Large-Scale Structure
We consider the effects of large structures in the Universe on the Hubble diagram. This problem is treated non-linearly by considering a Swiss Cheese model of the Universe in which under-dense voids are represented as ... -
Imprints of local lightcone projection effects on the galaxy bispectrum. Part III. Relativistic corrections from nonlinear dynamical evolution on large-scales
(IOP Publishing, 2018-03-01)The galaxy bispectrum is affected on equality scales and above by relativistic observational effects, at linear and nonlinear order. These lightcone effects include local contributions from Doppler and gravitational potential ... -
An Improved Treatment of Optics in the Lindquist-Wheeler Models
We consider the optical properties of Lindquist-Wheeler (LW) models of the Universe. These models consist of lattices constructed from regularly arranged discrete masses. They are akin to the Wigner-Seitz construction of ... -
Inhomogeneous Gravity
We study the inhomogeneous cosmological evolution of the Newtonian gravitational 'constant' G in the framework of scalar-tensor theories. We investigate the differences that arise between the evolution of G in the background ... -
Islands in the landscape
The string theory landscape consists of many metastable de Sitter vacua, populated by eternal inflation. Tunneling between these vacua gives rise to a dynamical system, which asymptotically settles down to an equilibrium ... -
Isocurvature constraints on portal couplings
(2016-06) -
The isotropic blackbody CMB as evidence for a homogeneous universe
(American Physical Society, 2012-08-01)The question of whether the Universe is spatially homogeneous and isotropic on the largest scales is of fundamental importance to cosmology, but has not yet been answered decisively. Surprisingly, neither an isotropic ...