Browsing Astronomy and Astrophysics by Title
Now showing items 92111 of 160

NekrasovShatashvili limit of the 5D superconformal index
(20160808) 
NonGaussianity in multiple threeform field inflation
(20161107) 
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 J07373039A/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 spacetime on large scales. We find new exact ... 
On symmetric Fixed Points and Superconformality
(201105) 
On Regular Hypergraphs of High Girth
(20140310)We give lower bounds on the maximum possible girth of an runiform, dregular 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 weakfield limit, and the impossibility of embedding some known solutions for isolated masses in cosmologies with f(R) dark energy
(20121002)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 ... 
On the Emergence of Accelerating Cosmic Expansion in f(R) Theories of Gravity
We consider cosmological modelling in $f(R)$ theories of gravity, using both topdown and bottomup constructions. The topdown models are based on RobertsonWalker geometries, and the bottomup constructions are built by ... 
On the superconformal index of Argyres–Douglas theories
(20160108) 
Optomechanical design of a new cross dispersion unit for the CRIRES+ high resolution spectrograph for the VLT
(20140101)© 2014 SPIE. CRIRES is one of the few IR (0.925.2 μm) highresolution spectrographs in operation at the VLT since 2006. Despite good performance it suffers a limitation that significantly hampers its ability: a small ... 
The Parameterised PostNewtonian Limit of Bimetric Theories of Gravity
We consider the postNewtonian limit of a general class of bimetric theories of gravity, in which both metrics are dynamical. The established parameterised postNewtonian approach is followed as closely as possible, although ... 
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)