Results 31 to 40 of about 500,277 (262)
From Dark Energy & Dark Matter to Dark Metric [PDF]
Foundations of Physics, 2009 It is nowadays clear that General Relativity cannot be the definitive theory of Gravitation due to several shortcomings that come out both from theoretical and experimental viewpoints. At large scales (astrophysical and cosmological) the attempts to match it with the latest observational data lead to invoke Dark Energy and Dark Matter as the bulk ...
CAPOZZIELLO, SALVATORE +3 more
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Dark energy without dark energy [PDF]
AIP Conference Proceedings, 2006 4 pages, 1 figure, to appear in AIP proceedings of "Dark side of the Universe"
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Dark Energy from Cosmological Energy Conservation
Advances in Astronomy, 2023 The value of the gravitational wave energy density is unknown. Current progress in gravitational wave detection suggests that the energy density of the stochastic gravitational wave background (SGWB) will be estimated in the next decades. A derivation of
Manuel Uruena Palomo
doaj +1 more source
DARK ENERGY, DARK MATTER AND GRAVITY [PDF]
International Journal of Modern Physics D, 2007 We discuss the motivation for high accuracy relativistic gravitational experiments in the solar system and complementary cosmological tests. We focus our attention on the issue of distinguishing a generic scalar theory of gravity as the underlying physical theory from the usual general-relativistic picture, where one expects the presence of ...
openaire +2 more sources
Dark group: dark energy and dark matter [PDF]
Physics Letters B, 2004 We study the possibility that a dark group, a gauge group with particles interacting with the standard model particles only via gravity, is responsible for containing the dark energy and dark matter required by present day observations. We show that it is indeed possible and we determine the constrains for the dark group.
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Structural insights into an engineered feruloyl esterase with improved MHET degrading properties
FEBS Letters, EarlyView.A feruloyl esterase was engineered to mimic key features of MHETase, enhancing the degradation of PET oligomers. Structural and computational analysis reveal how a point mutation stabilizes the active site and reshapes the binding cleft, expading substrate scope.
Panagiota Karampa +5 more
wiley +1 more source
Physics Letters B, 2003 Velocity-dependent interactions in a fundamental-string dominated universe lead quite naturally, with reasonable assumptions on initial conditions, to an accelerating expanding universe without assuming the existence of a cosmological constant. This result also holds generically for a universe dominated by moving extremal black holes, owing to a ...
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FEBS Letters, EarlyView.An unexpected alternative interaction site for ethyl viologen was identified in formate dehydrogenase 1 from Methylorubrum extorquens. Combined mutagenesis, kinetic analysis, and docking revealed that aromatic residues near an iron–sulfur cluster enable flavin mononucleotide‐independent electron transfer, offering a framework for engineering improved ...
Eleni G. Poloniataki, Yong Hwan Kim
wiley +1 more source
Inhomogeneous dark energy [PDF]
Journal of Cosmology and Astroparticle Physics, 2016 11 ...
Chamseddine Ali H., Mukhanov Viatcheslav
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Catalog-based detection of unrecognized blends in deep optical ground based imaging
The Open Journal of AstrophysicsIn deep, ground-based imaging, about 15%-30% of object detections are expected to correspond to two or more true objects - these are called "unrecognized blends''.
Shuang Liang +3 more
doaj +1 more source