Phantom crossing dark energy in Horndeski’s theory

Jiro Matsumoto

doi:10.1103/physrevd.97.123538

Phantom crossing with collisional matter in f(T) gravity

International Journal of Modern Physics D ◽

10.1142/s0218271816500577 ◽

2016 ◽

Vol 25 (05) ◽

pp. 1650057 ◽

Cited By ~ 13

Author(s):

M. Zubair

Keyword(s):

Dark Energy ◽

Late Time ◽

Eos Parameter ◽

Phantom Divide ◽

Phantom Crossing ◽

Phantom Divide Line ◽

C 71 ◽

Scalar Theories ◽

The One ◽

Crossing Of Phantom Divide

We study the late-time cosmological evolution of [Formula: see text] (where [Formula: see text] is the torsion scalar) theories with matter contents consisting of collisional self-interacting matter and radiations. The power law, exponential and logarithmic [Formula: see text] models are considered to explore the evolution of Hubble parameter [Formula: see text], dark energy (DE) equation of state (EoS) [Formula: see text] and effective EoS parameter [Formula: see text]. We show that crossing of phantom divide line can be realized in the presence of collisional matter as compared to the results obtained for the choice of noncollisional matter [K. Bamba, C.-Q. Geng, C.-C. Lee and L.-W. Luo, J. Cosmol. Astropart. Phys. 01 (2011) 021; K. Bamba, C.-Q. Geng and C.-C. Lee, arXiv:1008.4036]. The evolutionary behavior of [Formula: see text] is consistent with the one developed in [P. Wu and H. Yu, Eur. Phys. J. C 71 (2011) 1552] and recent observational data [U. Alam, V. Sahni and A. A. Starobinsky, J. Cosmol. Astropart. Phys. 0406 (2004) 008; S. Nesseris and L. Perivolaropoulos, J. Cosmol. Astropart. Phys. 0701 (2007) 018; P. Wu and H. Yu, Phys. Lett. B 643 (2006) 315; U. Alam, V. Sahni and A. A. Starobinsky, J. Cosmol. Astropart. Phys. 0702 (2007) 011; H. K. Jassal, J. S. Bagla and T. Padmanabhan, Mon. Not. R. Astron. Soc. 405 (2010) 2639].

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PHANTOM CROSSING IN VIABLE f(R) THEORIES

International Journal of Modern Physics D ◽

10.1142/s0218271811019517 ◽

2011 ◽

Vol 20 (08) ◽

pp. 1339-1345 ◽

Cited By ~ 18

Author(s):

KAZUHARU BAMBA ◽

CHAO-QIANG GENG ◽

CHUNG-CHI LEE

Keyword(s):

Dark Energy ◽

Equation Of State ◽

Modified Gravity ◽

Gravity Models ◽

Phantom Divide ◽

The Past ◽

Modified Gravity Theories ◽

Phantom Crossing ◽

Gravity Theories

We review the equation of state for dark energy in modified gravity theories. In particular, we summarize the generic feature of the phantom divide crossing in the past and future in viable f(R) gravity models.

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Dark Energy with Phantom Crossing and the H0 Tension

Entropy ◽

10.3390/e23040404 ◽

2021 ◽

Vol 23 (4) ◽

pp. 404

Author(s):

Eleonora Di Valentino ◽

Ankan Mukherjee ◽

Anjan A. Sen

Keyword(s):

Dark Energy ◽

Confidence Level ◽

Hubble Constant ◽

Acoustic Oscillation ◽

Energy Sector ◽

Local Measurement ◽

Microwave Background ◽

Perfect Agreement ◽

Cosmological Observations ◽

Phantom Crossing

We investigate the possibility of phantom crossing in the dark energy sector and the solution for the Hubble tension between early and late universe observations. We use robust combinations of different cosmological observations, namely the Cosmic Microwave Background (CMB), local measurement of Hubble constant (H0), Baryon Acoustic Oscillation (BAO) and SnIa for this purpose. For a combination of CMB+BAO data that is related to early universe physics, phantom crossing in the dark energy sector was confirmed at a 95% confidence level and we obtained the constraint H0=71.0−3.8+2.9 km/s/Mpc at a 68% confidence level, which is in perfect agreement with the local measurement by Riess et al. We show that constraints from different combinations of data are consistent with each other and all of them are consistent with phantom crossing in the dark energy sector. For the combination of all data considered, we obtained the constraint H0=70.25±0.78 km/s/Mpc at a 68% confidence level and the phantom crossing happening at the scale factor am=0.851−0.031+0.048 at a 68% confidence level.

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