Browsing Astronomy and Astrophysics by Title
Now showing items 5978 of 163

H 2 S in the L1157B1 bow shock
(Oxford University Press (OUP), 20161121) 
Habitable worlds around M dwarf stars: The CAPSCam astrometric planet search
(20120101)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 superEarths as well as gas ... 
Higher Powers in Gravitation
We consider the FriedmannRobertsonWalker cosmologies of theories of gravity that generalise the EinsteinHilbert action by replacing the Ricci scalar, R, with some function, f(R). The general asymptotic behaviour of these ... 
Hubble Diagram Dispersion From LargeScale Structure
We consider the effects of large structures in the Universe on the Hubble diagram. This problem is treated nonlinearly by considering a Swiss Cheese model of the Universe in which underdense voids are represented as ... 
Imprints of local lightcone projection effects on the galaxy bispectrum. Part III. Relativistic corrections from nonlinear dynamical evolution on largescales
(IOP Publishing, 20180301)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 LindquistWheeler Models
We consider the optical properties of LindquistWheeler (LW) models of the Universe. These models consist of lattices constructed from regularly arranged discrete masses. They are akin to the WignerSeitz construction of ... 
Inhomogeneous Gravity
We study the inhomogeneous cosmological evolution of the Newtonian gravitational 'constant' G in the framework of scalartensor 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
(201606) 
The isotropic blackbody CMB as evidence for a homogeneous universe
(American Physical Society, 20120801)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 ... 
Living in a Void: Testing the Copernican Principle with Distant Supernovae
(20080709)A fundamental presupposition of modern cosmology is the Copernican Principle; that we are not in a central, or otherwise special region of the Universe. Studies of Type Ia supernovae, together with the Copernican Principle, ...