Re-examining the role of curvature in the slowing down acceleration scenario

Lin, Jianmang; Wu, Puxun; Yu, Hongwei

doi:10.1103/physrevd.87.043502

Cited by 6 publications

(5 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…But in (Shafieloo et al 2009), Shafieloo, Sanhi, and Starobinsky proposed the possibility that the current CA is slowing down. Since this extremely counterintuitive phenomenon cannot be accommodated in almost all the mainstream models, this topic has attracted a lot of interests (Huang et al 2009;Gong et al 2010;Li, Wu & Yu 2011;Lin et al 2013;Cardenas & Rivera 2012;Cardenas et al 2013;Cardenas 2014) in recent years.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…In recent years, this topic has attracted a lot of interests (Huang et al 2009;Gong et al 2010;Li, Wu & Yu 2011;Lin et al 2013;Cardenas & Rivera 2012;Cardenas et al 2013; Cardenas 2014) For example, in (Li, Wu & Yu 2011), using the CPL model, the authors found that the Union2 SNe Ia data (Amanullah et al 2010) favor a slowing down CA at 1σ CL. In (Cardenas & Rivera 2012), also using the CPL model, the authors found that the combined Union2+BAO+CMB data also prefer a slowing down CA if the spatial curvature is taken into account.…”

mentioning

confidence: 99%

See 1 more Smart Citation

A Comprehensive Investigation on the Slowing Down of Cosmic Acceleration

Wang

et al. 2016

ApJ

View full text Add to dashboard Cite

Shafieloo ea al. firstly proposed the possibility that the current cosmic acceleration (CA) is slowing down. However, this is rather counterintuitive because a slowing down CA cannot be accommodated in most mainstream cosmological models. In this work, by exploring the evolutionary trajectories of dark energy equation of state w(z) and deceleration parameter q(z), we present a comprehensive investigation on the slowing down of CA from both the theoretical and the observational sides. For the theoretical side, we study the impact of different w(z) by using six parametrization models, and then discuss the effects of spatial curvature. For the observational side, we investigate the effects of different type Ia supernovae (SNe Ia), different baryon acoustic oscillation (BAO), and different cosmic microwave background (CMB) data, respectively. We find that (1) The evolution of CA are insensitive to the specific form of w(z); in contrast, a non-flat Universe more favors a slowing down CA than a flat Universe. (2) SNLS3 SNe Ia datasets favor a slowing down CA at 1σ confidence level, while JLA SNe Ia samples prefer an eternal CA; in contrast, the effects of different BAO data are negligible.(3) Compared with CMB distance prior data, full CMB data more favor a slowing down CA. (4) Due to the low significance, the slowing down of CA is still a theoretical possibility that cannot be confirmed by the current observations.

show abstract

Section: Summary and Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

A Comprehensive Investigation on the Slowing Down of Cosmic Acceleration

Wang

et al. 2016

ApJ

View full text Add to dashboard Cite

show abstract

“…However, some recent work has tried to find a slowing down of the acceleration. Moreover, this novel phenomenon has attracted much attention [48][49][50][51][52][53], including the recent work of [54]. Using the dark energy parameterizations, one found that the cosmic acceleration may already have peaked, and the expansion may be slowing down from the deceleration parameter being q 0 > 0.…”

Section: Convergence Issue In Current Datamentioning

confidence: 99%

What do we know about cosmography

Zhang

Xia

2017

Eur. Phys. J. C

View full text Add to dashboard Cite

In the present paper, we investigate the cosmographic problem using the bias-variance trade-off. We find that both the z-redshift and the y = z/(1 + z)-redshift can present a small bias estimation. It means that the cosmography can describe the supernova data more accurately. Minimizing risk, it suggests that cosmography up to the second order is the best approximation. Forecasting the constraint from future measurements, we find that future supernova and redshift drift can significantly improve the constraint, thus having the potential to solve the cosmographic problem. We also exploit the values of cosmography on the deceleration parameter and equation of state of dark energy w(z). We find that supernova cosmography cannot give stable estimations on them. However, much useful information was obtained, such as that the cosmography favors a complicated dark energy with varying w(z), and the derivative dw/dz < 0 for low redshift. The cosmography is helpful to model the dark energy.

show abstract

“…In refs. [18,19], the authors studied the CPL model again in the attendance of spatial curvature using different SNIa samples, BAO and CMB data. They found that incorporation of the spatial curvature can ameliorate above tension.…”

Section: Jcap12(2016)005mentioning

confidence: 99%

Test of the cosmic evolution using Gaussian processes

Zhang

Xia

2016

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

Much focus was on the possible slowing down of cosmic acceleration under the dark energy parametrization. In the present paper, we investigate this subject using the Gaussian processes (GP), without resorting to a particular template of dark energy. The reconstruction is carried out by abundant data including luminosity distance from Union2, Union2.1 compilation and gamma-ray burst, and dynamical Hubble parameter. It suggests that slowing down of cosmic acceleration cannot be presented within 95% C.L., in considering the influence of spatial curvature and Hubble constant. In order to reveal the reason of tension between our reconstruction and previous parametrization constraint for Union2 data, we compare them and find that slowing down of acceleration in some parametrization is only a "mirage". Although these parameterizations fits well with the observational data, their tension can be revealed by high order derivative of distance D. Instead, GP method is able to faithfully model the cosmic expansion history.

show abstract

Re-examining the role of curvature in the slowing down acceleration scenario

Cited by 6 publications

References 30 publications

A Comprehensive Investigation on the Slowing Down of Cosmic Acceleration

A Comprehensive Investigation on the Slowing Down of Cosmic Acceleration

What do we know about cosmography

Test of the cosmic evolution using Gaussian processes

Contact Info

Product

Resources

About