Results 111 to 120 of about 8,643,173 (282)
, 2019 The authors discuss in detail a popular scenario to alleviate the current Hubble tension (different measurements of the expansion rate of the Universe show a 4.4 $\ensuremath{\sigma}$ discrepancy), namely ``early dark energy''.
Florian Niedermann, M. Sloth
semanticscholar +1 more source
DARK ENERGY, WITH SIGNATURES [PDF]
International Journal of Modern Physics D, 2010 We propose a class of simple dark energy models which predict a late-time dark radiation component and a distinctive time-dependent equation of state w(z) for redshift z < 3. The dark energy field can be coupled strongly enough to standard model particles to be detected in colliders, and the model requires only modest additional particle content ...
Sourish Dutta +2 more
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Statefinder diagnosis and the interacting ghost model of dark energy
, 2012 A new model of dark energy namely "ghost dark energy model" has recently been suggested to interpret the positive acceleration of cosmic expansion. The energy density of ghost dark energy is proportional to the hubble parameter.
A. Anisimov +102 more
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The LSST Dark Energy Science Collaboration (DESC) Science Requirements Document [PDF]
, 2018 The Large Synoptic Survey Telescope (LSST) Dark Energy Science Collaboration (DESC) will use five cosmological probes: galaxy clusters, large scale structure, supernovae, strong lensing, and weak lensing.
The Lsst Dark Energy Science Collaboration +34 more
semanticscholar +1 more source
Physics Letters B, 2011 Using the "teleparallel" equivalent of General Relativity as the gravitational sector, which is based on torsion instead of curvature, we add a canonical scalar field, allowing for a nonminimal coupling with gravity. Although the minimal case is completely equivalent to standard quintessence, the nonminimal scenario has a richer structure, exhibiting ...
Yi-Peng Wu +3 more
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Dark energy in the swampland [PDF]
Physical Review D, 2018 In this Letter, we study the implications of string Swampland criteria for dark energy in view of ongoing and future cosmological observations. If string theory should be the ultimate quantum gravity theory, there is evidence that exact de Sitter solutions with a positive cosmological constant cannot describe the fate of the late-time universe.
Robert H. Brandenberger +3 more
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Entropy, 2017 The coupling between dark energy and dark matter provides a possible approach to mitigate the coincidence problem of the cosmological standard model. In this paper, we assumed the interacting term was related to the Hubble parameter, energy density of ...
Weiqiang Yang +4 more
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ON ANISOTROPIC DARK ENERGY [PDF]
Modern Physics Letters A, 2009 Since the discovery of accelerated expansion of the universe, it was necessary to introduce a new component of matter distribution called dark energy. The standard cosmological model considers isotropy of the pressure and assumes an equation of state p = ωρ, relating the pressure p and the energy density ρ.
M. F. A. da Silva +2 more
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Bouncing Cosmologies with Dark Matter and Dark Energy
Universe, 2016 We review matter bounce scenarios where the matter content is dark matter and dark energy. These cosmologies predict a nearly scale-invariant power spectrum with a slightly red tilt for scalar perturbations and a small tensor-to-scalar ratio. Importantly,
Yi-Fu Cai +3 more
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Weak lensing, dark matter and dark energy
, 2010 Weak gravitational lensing is rapidly becoming one of the principal probes of dark matter and dark energy in the universe. In this brief review we outline how weak lensing helps determine the structure of dark matter halos, measure the expansion rate of ...
A. Amara +123 more
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