What are recent observations telling us in light of improved tests of distance duality relation?

Liu, Tonghua; Cao, Shuo; Ma, Siwei; Liu, Yuting; Zheng, Chenfa; Wang, Jieci

doi:10.1016/j.physletb.2023.137687

Cited by 10 publications

(4 citation statements)

References 71 publications

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“…In addition, we also summarized our findings with robust nonparametric statistics by calculating the median and the corresponding median absolute deviation (Zheng et al 2016; The blue, green, red, and orange lines correspond to the redshift distributions of cosmic chronometers, GW sources used in simulating the acceleration parameters, UV-X QSO data, and Pantheon SNe Ia, respectively. Liu et al 2023). Considering that the probability that the nth observation is higher than the median follows the binomial distribution (Feigelson & Babu 2012)…”

Section: Results and Conclusionmentioning

confidence: 99%

Measuring the Speed of Light with Updated Hubble Diagram of High-redshift Standard Candles

Liu

Cao

Biesiada

et al. 2023

ApJ

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The possible time variation of the fundamental constants of nature has been an active subject of research in modern physics. In this paper, we propose a new method to investigate such possible time variation of the speed of light c using the updated Hubble diagram of high-redshift standard candles including Type Ia Supernovae (SNe Ia) and high-redshift quasars (based on UV–X relation). Our findings show that the SNe Ia Pantheon sample, combined with currently available sample of cosmic chronometers, would produce robust constraints on the speed of light at the level of c/c 0 = 1.03 ± 0.03. For the Hubble diagram of UV+X-ray quasars acting as a new type of standard candle, we obtain c/c 0 = 1.19 ± 0.07. Therefore, our results confirm that there is no strong evidence for deviation from a constant speed of light up to z ∼ 2. Moreover, we discuss how our technique might be improved at much higher redshifts (z ∼ 5), focusing on future measurements of the acceleration parameter X(z) with gravitational waves (GWs) produced by binary neutron star mergers. In particular, in the framework of the second-generation space-based GW detector, DECi-hertz Interferometer Gravitational Wave Observatory, the speed of light is expected to be constrained with a precision of Δc/c = 10−3.

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Section: Results and Conclusionmentioning

confidence: 99%

Measuring the Speed of Light with Updated Hubble Diagram of High-redshift Standard Candles

Liu

Cao

Biesiada

et al. 2023

ApJ

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“…where h(z) ≡ H(z)/100 km s −1 Mpc −1 (Sahni et al 2014). It means that once we get the measurements of the Hubble parameter H(z) at two or more redshifts directly from the observations, we can obtain the Omh 2 (z i , z j ) values and further compare them with theoretical values derived from concrete cosmological models (Liu et al 2023).…”

Section: Methodology and Datamentioning

confidence: 99%

Distinguishing ΛCDM from Evolving Dark Energy with Om Two-point Statistics: Implications from the Space-borne Gravitational-wave Detector

Liu,

Cao,

Zheng

et al. 2024

ApJ

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The Omh 2(z i , z j ) two-point diagnostics was proposed as a litmus test of the ΛCDM model, and measurements of the cosmic expansion rate H(z) have been extensively used to perform this test. The results obtained so far suggested a tension between observations and predictions of the ΛCDM model. However, the data set of H(z) direct measurements from cosmic chronometers and baryon acoustic oscillations was quite limited. This motivated us to study the performance of this test on a larger sample obtained in an alternative way. In this paper, we propose that gravitational-wave (GW) standard sirens could provide large samples of H(z) measurements in the redshift range of 0 < z < 5, based on the measurements of the dipole anisotropy of luminosity distance arising from the matter inhomogeneities of the large-scale structure and the local motion of the observer. We discuss the effectiveness of our method in the context of the space-borne DECi-herz Interferometer Gravitational-wave Observatory, based on a comprehensive H(z) simulated data set from binary neutron star merger systems. Our results indicate that in the GW domain, the Omh 2(z i , z j ) two-point diagnostics could effectively distinguish whether ΛCDM is the best description of our Universe. We also discuss the potential of our methodology in determining possible evidence for dark energy evolution, focusing on its performance on the constant and redshift-dependent dark energy equation of state.

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“…Therefore, the DDR is completely independent of the cosmological model. Up to now, numerous works [62][63][64][65][66] focused on testing the DDR with the real data, demonstrated lack of evidence for noticeable departure from the DDR. According to the philosophy of Renzi & Silvestri [46] one can rewrite Eq.…”

Section: Methodology and Observational Data A Methodology Of Measurin...mentioning

confidence: 99%

Measurements of the Hubble constant from combinations of supernovae and radio quasars

Liu,

Yang,

Zhang

et al. 2023

Physics Letters B

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What are recent observations telling us in light of improved tests of distance duality relation?

Cited by 10 publications

References 71 publications

Measuring the Speed of Light with Updated Hubble Diagram of High-redshift Standard Candles

Measuring the Speed of Light with Updated Hubble Diagram of High-redshift Standard Candles

Distinguishing ΛCDM from Evolving Dark Energy with Om Two-point Statistics: Implications from the Space-borne Gravitational-wave Detector

Measurements of the Hubble constant from combinations of supernovae and radio quasars

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