Results 101 to 110 of about 16,133 (302)
The viability of modified gravity theories [PDF]
, 2009 PhDThis thesis studies the viability of classes of modified gravity (MG) theories based on generalisations of the Einstein-Hilbert action. Particular emphasis is given to f(R) theories in both the metric and Palatini formalisms, scalar-tensor theories ...
Uddin, Kotub
core
Supernovae data: Cosmological Constant or ruling out the Cosmological Principle ? [PDF]
, 2000 4 LaTex pagesAnalysed in the framework of homogeneous FLRW models, the magnitude-redshift data from high redshift supernovae yield, as a primary result, a strictly positive cosmological constant.
M. N. CÉLÉRIER +1 more
core +1 more source
Topology‐based Visual Analysis of Hydrothermal Plumes
Computer Graphics Forum, EarlyView.Abstract Hydrothermal plumes are turbulent structures of intense heat and mineral smoke that rise and disperse into the deep ocean. Existing models generally characterize these systems as a single axisymmetric plume originating from a point source. However, this assumption breaks down in weakly venting, spatially distributed systems, where low‐flux ...
Adhitya Kamakshidasan +3 more
wiley +1 more source
Hadrons, superconductor vortices, and cosmological constant
Physics Letters BWe explore the roles of the trace anomaly in several hadron properties. We derive the scale invariant expression for the pressure from the gravitational form factors (GFF) of QCD which results in consistent results for the mass and rest energy from the ...
Keh-Fei Liu
doaj +1 more source
Varying Constants, Gravitation and Cosmology [PDF]
Living Reviews in Relativity, 2011 Abstract Fundamental constants are a cornerstone of our physical laws. Any constant varying in space and/or time would reflect the existence of an almost massless field that couples to matter. This will induce a violation of the universality of free fall.
openaire +5 more sources
Scalable Computation of Topological Abstractions for Scalar Data
Computer Graphics Forum, EarlyView.Abstract Topological data analysis has become an important tool for large scale scalar data analysis and visualization, efficiently extracting the inherent structure and features of interest of the data. However, with growing dataset sizes and complexity, it is increasingly becoming infeasible to compute topological abstractions of interest in serial ...
M. Will +6 more
wiley +1 more source
Quantum Fields and the Cosmological Constant
UniverseIt has been shown that if one solves self-consistently the semiclassical Einstein equations in the presence of a quantum scalar field, with a cutoff on the number of modes, spacetime become flatter when the cutoff increases. Here, we extend the result to
Renata Ferrero +2 more
doaj +1 more source
Cosmic expansion in homogeneous and inhomogeneous universes : supernovae type Ia as cosmic probes [PDF]
, 2010 Seikel M. Cosmic expansion in homogeneous and inhomogeneous universes : supernovae type Ia as cosmic probes. Bielefeld (Germany): Bielefeld University; 2010.Since it has been discovered in the late 1990s that the universe is likely to be expanding ...
Seikel, Marina
core +1 more source
Unified Dark Matter scalar field models with fast transition [PDF]
, 2011 We investigate the general properties of Unified Dark Matter (UDM) scalar field models with Lagrangians with a non-canonical kinetic term, looking specifically for models that can produce a fast transition between an early Einstein-de Sitter CDM-like era
Bertacca, Daniele +9 more
core +1 more source
Similar or Different? Configurations of Authenticity Across Museum Types
Curator: The Museum Journal, EarlyView.ABSTRACT Authenticity is traditionally regarded as playing a crucial role in museums, science centers, and memorials. However, despite this fact, authenticity has very different meanings in different (institutional) settings. This complicates shared communications across museum practices.
S. Schwan +18 more
wiley +1 more source