Results 21 to 30 of about 1,836,799 (336)
RECONSTRUCTING DARK ENERGY [PDF]
International Journal of Modern Physics D, 2006 This review summarizes recent attempts to reconstruct the expansion history of the universe and to probe the nature of dark energy. Reconstruction methods can be broadly classified into parametric and non-parametric approaches. It is encouraging that, even with the limited observational data currently available, different approaches give consistent ...
Sahni, Varun, Starobinsky, Alexei
openaire +3 more sources
DARK ENERGY WITH DARK SPINORS [PDF]
Modern Physics Letters A, 2010 Ever since the first observations that we are living in an accelerating universe, it has been asked what dark energy is. There are various explanations, all of which have various drawbacks or inconsistencies. Here we show that using a dark spinor field it is possible to have an equation of state that crosses the phantom divide, becoming a dark phantom
Boehmer, Christian G., Burnett, James
openaire +2 more sources
Inhomogeneous dark energy [PDF]
Journal of Cosmology and Astroparticle Physics, 2016 11 ...
Chamseddine Ali H., Mukhanov Viatcheslav
openaire +2 more sources
DARK ENERGY WITHOUT DARK ENERGY [PDF]
Dark Matter in Astroparticle and Particle Physics, 2008 32 pages, 8 figures; Invited contribution to appear in the Proceedings of the Dark2007 Conference, Sydney, Australia, Sept 2007, eds H. Klapdor-Kleingrothaus and G.F. Lewis, (World Scientific, Singapore, 2008)
openaire +2 more sources
ELECTROMAGNETIC DARK ENERGY [PDF]
International Journal of Modern Physics D, 2008 We introduce a new model for dark energy in the Universe in which a small cosmological constant is generated by ordinary electromagnetic vacuum energy. The corresponding virtual photons exist at all frequencies but switch from a gravitationally active phase at low frequencies to a gravitationally inactive phase at higher frequencies via a Ginzburg ...
Beck, Christian, Mackey, Michael C.
openaire +2 more sources
On dark matter and dark energy
Литьë и металлургия, 2020 The dark matter hypothesis was created to explain the reason for the preservation of stellar clusters from dispersion. The weak point of this hypothesis is the great age of space, which is 13.8 billion years.
V. Yu. Stetsenko, A. V. Stetsenko
doaj +1 more source
The Astronomical Journal, 2023 We present a study of the potential for convolutional neural networks (CNNs) to enable separation of astrophysical transients from image artifacts, a task known as “real–bogus” classification, without requiring a template-subtracted (or difference) image,
Tatiana Acero-Cuellar +5 more
doaj +1 more source
Physical Review D, 2010 Dark energy dynamics in the recent universe is influenced by its evolution through the long, matter dominated expansion history. A particular dynamical property, the flow variable, remains constant in several classes of scalar field models as long as matter dominates; the dark energy is only free to diverge in behavior at recent times.
Cortês, Marina, Linder, Eric V.
openaire +2 more sources
Physical Review D, 2020 Theories with a pole in the kinetic term have been used to great effect in studying inflation, owing to their quantum stability and attractor properties. We explore the use of such pole kinetic terms in dark energy theories, finding an interesting link between thawing and freezing models, and the possibility of enhanced plateaus with ``superattractor''-
openaire +2 more sources