Putting Flat $Λ$CDM In The (Redshift) Bin

Colgáin, Eoin Ó; Sheikh-Jabbari, M. M.; Solomon, Rance; Dainotti, Maria Giovanna; Stojković, Dejan

doi:10.48550/arxiv.2206.11447

Cited by 20 publications

(28 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The standardization of quasars through the L X À L UV relation is a rather young technique and it is still subject to extensive tests by several independent groups ( e.g. Dainotti et al 2022a;Colgáin et al 2022b, a, see also Ratra 2020b, c, 2021).…”

Section: Systematic Effectsmentioning

confidence: 99%

Unveiling the Universe with emerging cosmological probes

et al. 2022

View full text Add to dashboard Cite

The detection of the accelerated expansion of the Universe has been one of the major breakthroughs in modern cosmology. Several cosmological probes (Cosmic Microwave Background, Supernovae Type Ia, Baryon Acoustic Oscillations) have been studied in depth to better understand the nature of the mechanism driving this acceleration, and they are being currently pushed to their limits, obtaining remarkable constraints that allowed us to shape the standard cosmological model. In parallel to that, however, the percent precision achieved has recently revealed apparent tensions between measurements obtained from different methods. These are either indicating some unaccounted systematic effects, or are pointing toward new physics. Following the development of CMB, SNe, and BAO cosmology, it is critical to extend our selection of cosmological probes. Novel probes can be exploited to validate results, control or mitigate systematic effects, and, most importantly, to increase the accuracy and robustness of our results. This review is meant to provide a state-of-art benchmark of the latest advances in emerging “beyond-standard” cosmological probes. We present how several different methods can become a key resource for observational cosmology. In particular, we review cosmic chronometers, quasars, gamma-ray bursts, standard sirens, lensing time-delay with galaxies and clusters, cosmic voids, neutral hydrogen intensity mapping, surface brightness fluctuations, stellar ages of the oldest objects, secular redshift drift, and clustering of standard candles. The review describes the method, systematics, and results of each probe in a homogeneous way, giving the reader a clear picture of the available innovative methods that have been introduced in recent years and how to apply them. The review also discusses the potential synergies and complementarities between the various probes, exploring how they will contribute to the future of modern cosmology.

show abstract

Section: Systematic Effectsmentioning

confidence: 99%

Unveiling the Universe with emerging cosmological probes

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Based on the ΛCDM model, the high-redshift CMB radiation data (Planck Collaboration 2020) give a tight constraint on H 0 (67.4 ± 0.5 km s −1 Mpc −1 ), which deviates from H 0 = 73.2 ± 1.3 km s −1 Mpc −1 given by the low-redshift SN Ia data (Riess et al 2018a(Riess et al , 2018b(Riess et al , 2021 more than 4σ. Although many other observations such as the Hubble parameter H(z) measurements, the BAO, and the strong gravitational lenses have been used to discuss this H 0 tension, its origin is not yet determined (Chen et al 2017;Wu et al 2017;Abbott et al 2018;Birrer et al 2020;Efstathiou 2020;Cao et al 2021a;Freedman 2021;Khetan et al 2021;Lin & Ishak 2021;Cao & Ratra 2022b;Colgáin et al 2022aColgáin et al , 2022b. Since the farthest redshift of the popular SN Ia, H(z) and BAO data is about two, while the CMB radiation data lie near the redshift of 1100, the cosmological data during the region of middle redshift (2  z  1100) may play an important role in understanding the origin of the H 0 tension.…”

Section: Introductionmentioning

confidence: 99%

Gamma-Ray Burst Constraints on Cosmological Models from the Improved Amati Correlation

Liu

Liang

Xie

et al. 2022

ApJ

View full text Add to dashboard Cite

An improved Amati correlation was constructed in ApJ 931 (2022) 50 by us recently. In this paper, we further study constraints on the ΛCDM and wCDM models from the gamma-ray bursts (GRBs) standardized with the standard and improved Amati correlations, respectively. By using the Pantheon Type Ia supernova sample to calibrate the latest A220 GRB data set, the GRB Hubble diagram is obtained model-independently. We find that at the high-redshift region (z > 1.4) the GRB distance modulus from the improved Amati correlation is larger apparently than that from the standard Amati one. The GRB data from the standard Amati correlation only give a lower bound limit on the present matter density parameter Ωm0, while the GRBs from the improved Amati correlation constrain the Ωm0 with the 68% confidence level to be 0.308 − 0.230 + 0.066 and 0.307 − 0.290 + 0.057 in the ΛCDM and wCDM models, respectively, which are very consistent with those given by other current popular observational data including baryon acoustic oscillation, cosmic microwave background (CMB) radiation, and so on. Once the H(z) data are added in our analysis, the constraint on the Hubble constant H 0 can be achieved. We find that two different correlations provide slightly different H 0 results but the marginalized mean values seem to be close to that from the Planck 2018 CMB radiation observations.

show abstract

“…comparing equation (33) with equation ( 5), we have the following corresponding expression for (I/I 0 ) and J…”

Section: Reconstruction Of Coupled Generalized Three-form Dark Energy...mentioning

confidence: 99%

“…[8] (A lens equals to 1 in the ΛCDM model). Some of these discrepancies may due to considerable unaccounted systematic errors in the Planck observation and/or the local distance ladder measurements, however, this is not the case for the Hubble tension, indeed, as shown in [28][29][30][31][32][33], there is an evidence for a descending trend in the Hubble constant. Krishnan et al in [28] considered data set comprising megamasers, cosmic chronometers (CC), SNe Ia and baryonic acoustic oscillations (BAO), and binned them according to their redshift.…”

Section: Introductionmentioning

confidence: 99%

Can interacting dark energy with dynamical coupling resolve the Hubble tension

Yao¹,

Meng²

2022

Preprint

View full text Add to dashboard Cite

The H0 tension between low-and high-redshift measurements is definitely a serious issue faced by current cosmologists since it ranges from 4σ to 6σ. To relieve this tension, in this paper we propose a new interacting dark energy model with time varying coupling parameter by parameterizing the densities of dark matter and dark energy, this parametric approach for interacting dark sectors are inspired by our previous work concerning the coupled generalized three-form dark energy model in which dark matter and dark energy behave like two uncoupled dark sectors with effective equation of state when the three-form |κX| 1, for this reason, we reconstruct coupled generalized threeform dark energy from such parametric model under the condition |κX0|1. In the end, we place constraints on the parametric model with the coupled generalized three-form dark energy model proposed in our previous work in light of the Planck 2018 cosmic microwave background (CMB) distance priors, baryon acoustic oscillations (BAO) data from the Baryon Oscillation Spectroscopic Survey (BOSS) Data Release (DR) 12, Pantheon compilation of Type Ia supernovae (SN Ia) data and the latest local determinations of the Hubble constant from Riess et al., i.e. the so called R20. The fitting results show that, comparing to R20, the parametric model relieves the Hubble tension to 0.05σ with χ 2 min = 6.70 and the coupled generalized three-form dark energy model relieves the Hubble tension to 0.70σ with χ 2 min = 9.02. However, it is worth noting that the tiny Hubble tension between R20 and the parametric model is mostly due to the fact that the introduction of the parameter k greatly increase the uncertainty of the Hubble constant obtained without using a H0 prior.

show abstract

Putting Flat $Λ$CDM In The (Redshift) Bin

Cited by 20 publications

References 57 publications

Unveiling the Universe with emerging cosmological probes

Unveiling the Universe with emerging cosmological probes

Gamma-Ray Burst Constraints on Cosmological Models from the Improved Amati Correlation

Can interacting dark energy with dynamical coupling resolve the Hubble tension

Contact Info

Product

Resources

About