![]() ![]() A framework for the next generation of stationary cosmological models. DNest4: diffusive nested sampling in C++ and Python. Fast and scalable gaussian process modeling with applications to astronomical time series. Improving damped random walk parameters for SDSS Stripe 82 quasars with Pan-STARRS1. Legacy Survey of Space and Time cadence strategy evaluations for active galactic nucleus time-series data in Wide-Fast-Deep field. Are the variations in quasar optical flux driven by thermal fluctuations? Astrophys. Gaussian process regression for astronomical time-series. Spectral energy distributions and multiwavelength selection of type 1 quasars. A catalog of quasar properties from Sloan Digital Sky Survey Data Release 7. Optical variability of quasars with 20-yr photometric light curves. Using quasars as standard clocks for measuring cosmological redshift. A problem with the analysis of type Ia supernovae. Tests and problems of the standard model in cosmology. New evidence for a cosmological distribution of stellar mass primordial black holes. Quasar variability and gravitational microlensing. Gravitational microlensing, quasar variability and missing matter. ![]() Accretion of interstellar matter by massive objects. 3C 273: a star-like object with large red-shift. Fast radio bursts at the dawn of the 2020s. Search for cosmological time dilation from gamma-ray bursts-a 2021 status update. Investigating signatures of cosmological time dilation in duration measures of prompt gamma-ray burst light curves. Cosmological time dilation in durations of swift long gamma-ray bursts. On the lack of time dilation signatures in gamma-ray burst light curves. Detection of signature consistent with cosmological time dilation in gamma-ray bursts. Time dilation in type Ia supernova spectra at high redshift. A definitive measurement of time dilation in the spectral evolution of the moderate-redshift type Ia supernova 1997ex. Timescale stretch parameterization of type Ia supernova B-band light curves. Time dilation from spectral feature age measurements of type IA supernovae. Time dilation in the light curve of the distant type IA supernova SN 1995K. Possible applications of supernovae to the study of the nebular red shifts. A homogeneous universe of constant mass and increasing radius accounting for the radial velocity of extra-galactic nebulae. Un Univers homogène de masse constante et de rayon croissant rendant compte de la vitesse radiale des nébuleuses extra-galactiques. Hence, as well as dismissing the claim that the apparent lack of the redshift dependence of quasar variability represents a substantial challenge to the standard cosmological model, this analysis further indicates that the properties of quasars are consistent with them being truly cosmologically distant sources. This detection counters previous claims that observed quasar variability lacked the expected redshift-dependent time dilation. Here we present the identification of cosmic time dilation in a sample of 190 quasars monitored for over two decades in multiple wavebands by assessing various hypotheses through Bayesian analysis. While observations of cosmological supernovae unambiguously show the expected redshift-dependent time dilation, this has not been the case for other distant sources. A fundamental prediction of relativistic cosmologies is that, owing to the expansion of space, observations of the distant cosmos should be time dilated and appear to run slower than events in the local universe. ![]()
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