Dark energy
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Some aspects of generalized modified gravity models
R Myrzakulov, L Sebastiani, S Zerbini - International Journal of …, 2013 - World Scientific
In this paper, we review some general aspects of modified gravity theories, investigating
mathematical and physical properties and, more specifically, the feature of viable and …
mathematical and physical properties and, more specifically, the feature of viable and …
Equation of state for dark energy in f (T) gravity
We study the cosmological evolutions of the equation of state for dark energy w DE in the
exponential and logarithmic as well as their combination f (T) theories. We show that the …
exponential and logarithmic as well as their combination f (T) theories. We show that the …
f(T) models with phantom divide line crossing
P Wu, H Yu - The European Physical Journal C, 2011 - Springer
In this paper, we propose two new models in f (T) gravity to realize the crossing of the
phantom divide line for the effective equation of state, and we then study the observational …
phantom divide line for the effective equation of state, and we then study the observational …
Does dark energy really revive using DESI 2024 data?
We investigate the impact of the Dark Energy Spectroscopic Instrument (DESI) 2024 data on
dark energy scenarios. We thus analyze three typologies of models, the first in which the …
dark energy scenarios. We thus analyze three typologies of models, the first in which the …
Binned Hubble parameter measurements and the cosmological deceleration–acceleration transition
O Farooq, S Crandall, B Ratra - Physics Letters B, 2013 - Elsevier
Weighted mean and median statistics techniques are used to combine 23 independent
lower redshift, z< 1.04, Hubble parameter, H (z), measurements and determine binned forms …
lower redshift, z< 1.04, Hubble parameter, H (z), measurements and determine binned forms …
Testing dark energy models in the light of tension
It has been pointed out that there exists a tension in σ _8-\varOmega _m σ 8-Ω m
measurement between CMB and LSS observation. In this paper we show that σ _8 …
measurement between CMB and LSS observation. In this paper we show that σ _8 …
Cosmic history of viable exponential gravity: Equation of state oscillations and growth index from inflation to dark energy era
K Bamba, A Lopez-Revelles… - … and Quantum Gravity, 2012 - iopscience.iop.org
A generic feature of viable F (R) gravity is investigated: it is demonstrated that during the
matter dominated era the large frequency oscillations of the effective dark energy may …
matter dominated era the large frequency oscillations of the effective dark energy may …
Hubble parameter measurement constraints on dark energy
O Farooq, D Mania, B Ratra - The Astrophysical Journal, 2013 - iopscience.iop.org
We use 21 Hubble parameter versus redshift data points from Simon et al., Gaztañaga et al.,
Stern et al., and Moresco et al. to place constraints on model parameters of constant and …
Stern et al., and Moresco et al. to place constraints on model parameters of constant and …
No realistic wormholes from ghost-free scalar-tensor phantom dark energy
KA Bronnikov, AA Starobinsky - JETP letters, 2007 - Springer
It is proven that no wormholes can be formed in viable scalar-tensor models of dark energy
admitting its phantom-like (w<− 1) behavior in cosmology, even in the presence of electric or …
admitting its phantom-like (w<− 1) behavior in cosmology, even in the presence of electric or …