Browsing Astronomy and Astrophysics by Title
Now showing items 112131 of 163

The Parameterised PostNewtonian Limit of FourthOrder Theories of Gravity
We determine the full postNewtonian limit of theories of gravity that extend general relativity by replacing the Ricci scalar, R, in the generating Lagrangian by some analytic function, f(R). We restrict ourselves to ... 
The partition function of ABJ theory
(201305) 
Perturbation Theory in LemaitreTolmanBondi Cosmology
The LemaitreTolmanBondi solution has received much attention as a possible alternative to Dark Energy, as it is able to account for the apparent acceleration of the Universe without any exotic matter content. However, ... 
Phosphorusbearing molecules in solartype star forming regions: First PO detection
(Blackwell Publishing Inc., 20161111) 
Piecewise Silence in Discrete Cosmological Models
We consider a family of cosmological models in which all mass is confined to a regular lattice of identical black holes. By exploiting the reflection symmetry about planes that bisect these lattices into identical halves, ... 
PostNewtonian cosmological modelling
(20150526) 
The Power of General Relativity
We study the cosmological and weakfield properties of theories of gravity derived by extending general relativity by means of a Lagrangian proportional to $R^{1+\delta}$. This scalefree extension reduces to general ... 
Properties of Black Hole Radiation From Tunnelling
We consider the spacetime associated with the evaporation of a black hole by quantum mechanical tunnelling events. It is shown that the surface through which tunnelling occurs is distinct from the global event horizon, ... 
PyTransport: A Python package for the calculation of inflationary correlation functions
(20160905)PyTransport constitutes a straightforward code written in C++ together with Python scripts which automatically edit, compile and run the C++ code as a Python module. It has been written for Unixlike systems (OS X and ... 
Roulettes: A weak lensing formalism for strong lensing — II. Derivation and analysis —
(IOP Publishing: Hybrid Open Access, 20161114) 
Safely smoothing spacetime: backreaction in relativistic cosmological simulations
(IOP Publishing, 20190110)A persistent theme in the study of dark energy is the question of whether it really exists or not. It is often claimed that we are miscalculating the cosmological model by neglecting the effects associated with averaging ...