In this paper, we examine the origin of redshift in the FriedmannRobertsonWalker (FRW) metrics with constant spacetime curvature, and show that at least for the static spacetimes the interpretation of z as due t
If, on the other hand, QSO redshifts are unrelated to their distances, one would expect to find as many cases in which the foreground QSO has the higher redshift of the two; or if the absorption lines are not even due to intervening matter, there should be no coincidences of absorption...
M. et al. Interpreting the evolution of the size–luminosity relation for disk galaxies from redshift 1 to the present. Astrophys. J. 728, 51 (2011). ADS Google Scholar Guedes, J., Callegari, S., Madau, P. & Mayer, L. Forming realistic late-type spirals in a ΛCDM universe: the...
This way, DeepSphere is a special case of a graph CNN, tailored to the HEALPix sampling of the sphere. This approach is computationally more efficient than using spherical harmonics to perform convolutions. We demonstrate the method on a classification problem of weak lensing mass maps from two...
Therefore, the aim of our study is twofold: firstly, to constrain f(Q) gravity by means of Bayesian analysis using redshift space distortion data, and secondly, to investigate whether this model can effectively explain the accelerated phase of the Universe without the need to introduce dark ...
Different forms of noise exist and their mathematical modelling is different depending upon its properties. Various physical processes evolve the power spectrum of the universe on a large scale. The initial power spectrum imparted due to the quantum fluctuations follows a negative third power of ...
In this paper we summarise the constraints that low-redshift data—such as supernovae Ia (SN Ia), baryon acoustic oscillations (BAO) and cosmic chrono
component at low redshifts. This is due to the fact that SN data allows a direct measure of the luminosity distance, which is directly related to the expansion law of the universe. Since 1998, many dark energy models have been proposed in the literature. The simplest one is that dark ene...
Nevertheless, their dynamics are quite different at high redshifts. Therefore, there is an urgent need for high-redshift cosmological probes, such as quasars, to perform observational tests and place constraints on the models. Quasars (QSOs) are among the brightest sources of stars in the ...
It has recently been shown that second-order corrections to the background distance-redshift relation can build up significantly at large redshifts, due to an aggregation of gravitational lensing events. This shifts the expectation value of the distance to the CMB by 1%. In this paper we show...