Browsing Astronomy and Astrophysics by Title
Now showing items 111-130 of 195
-
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 ... -
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 top-down and bottom-up constructions. The top-down models are based on Robertson-Walker geometries, and the bottom-up constructions are built by ... -
On the superconformal index of Argyres–Douglas theories
(2016-01-08) -
Opto-mechanical design of a new cross dispersion unit for the CRIRES+ high resolution spectrograph for the VLT
(2014-01-01)© 2014 SPIE. CRIRES is one of the few IR (0.92-5.2 μm) high-resolution spectrographs in operation at the VLT since 2006. Despite good performance it suffers a limitation that significantly hampers its ability: a small ...