Results 61 to 70 of about 738,435 (332)
One-loop quantum corrections to cosmological scalar field potentials
, 2007 We study the loop corrections to potentials of complex or coupled real scalar fields used in cosmology to account for dark energy, dark matter or dark fluid.
Alexandre Arbey +3 more
core +1 more source
Peptide‐based ligand antagonists block a Vibrio cholerae adhesin
FEBS Letters, EarlyView.The structure of a peptide‐binding domain of the Vibrio cholerae adhesin FrhA was solved by X‐ray crystallography, revealing how the inhibitory peptide AGYTD binds tightly at its Ca2+‐coordinated pocket. Structure‐guided design incorporating D‐amino acids enhanced binding affinity, providing a foundation for developing anti‐adhesion therapeutics ...
Mingyu Wang +9 more
wiley +1 more source
Kiselev black holes in anti-de Sitter spacetime are not viable
Nuclear Physics BWhile the Kiselev black hole solution does not describe a perfect fluid quintessence, it is possible that dark energy fluid is not isotropic, and so one may hope that the solution may still describe at least locally a black hole embedded in such a dark ...
Jiayi Xia, Yen Chin Ong
doaj +1 more source
Could pressureless dark matter have pressure?
, 2012 A two-fluid dark matter model, in which dark matter is represented as a two-component fluid thermodynamic system, without interaction between the constituent particles of different species, and with each distinct component having a different four ...
Albuquerque +46 more
core +1 more source
Affine equation of state from quintessence and k-essence fields [PDF]
, 2007 We explore the possibility that a scalar field with appropriate Lagrangian can mimic a perfect fluid with an affine barotropic equation of state. The latter can be thought of as a generic cosmological dark component evolving as an effective cosmological ...
Amedeo Balbi +14 more
core +2 more sources
A Nonuniform Dark Energy Fluid: Perturbation Equations [PDF]
The Astrophysical Journal Supplement Series, 2008 We propose that galactic dark matter can be described by a nonuniform dark energy fluid. The underlying field is a decaying vector field, which might corresponds to a photon-like but massive particle of 4 degrees of dynamical freedom. We propose a very general Lagrangian for this vector field.
Halle, A., Zhao, H., Li, B.
openaire +2 more sources
Mechanisms of parasite‐mediated disruption of brain vessels
FEBS Letters, EarlyView.Parasites can affect the blood vessels of the brain, often causing serious neurological problems. This review explains how different parasites interact with and disrupt these vessels, what this means for brain health, and why these processes matter. Understanding these mechanisms may help us develop better ways to prevent or treat brain infections in ...
Leonor Loira +3 more
wiley +1 more source
Dark matter fluid constraints from galaxy rotation curves
European Physical Journal C: Particles and Fields, 2023 Galaxy rotation curves are considered to be convincing evidence for dark matter or some dynamically equivalent alternative mechanism. Starting only from the rotation curve data, we present a model independent approach of testing a general hypothesis that
Dalibor Perković, Hrvoje Štefančić
doaj +1 more source
Unifying dark energy and dark matter with a scalar field
, 2005 The standard model of cosmology considers the existence of two components of unknown nature, ``dark matter'' and ``dark energy'', which determine the cosmological evolution. Their nature remains unknown, and other models can also be considered.
Arbey, A.
core +1 more source
Dark energy as an elastic strain fluid [PDF]
, 2012 The origin of the accelerated expansion of the universe is still unclear and new physics is needed on cosmological scales. We propose and test a novel interpretation of dark energy as originated by an elastic strain due to a cosmic defect in an otherwise
Radicella, Ninfa +2 more
core +2 more sources