Zobrazeno 1 - 10
of 100
pro vyhledávání: '"BERNUI, ARMANDO"'
We investigate the large-angle distribution of the gamma-ray bursts (GRB) from the updated FERMI/GBM catalogue, to probe the statistical isotropy of these astrophysical transient events. We also study the angular distribution of the GRB fluence, as a
Externí odkaz:
http://arxiv.org/abs/2409.01480
The standard model of cosmology describes the matter fluctuations through the matter power spectrum, where $\sigma_{8} \equiv \sigma_{8,0} \equiv \sigma_{8}(z = 0)$, defined at the scale of $8\,h^{-1}$\,Mpc, acts as a normalisation parameter. Current
Externí odkaz:
http://arxiv.org/abs/2406.16693
The {\em bulk flow} in the Local Universe is a collective phenomenon due to the peculiar motions of matter structures, which, instead of moving in random directions, appears to follow an approximate dipole velocity flow. We apply a directional analys
Externí odkaz:
http://arxiv.org/abs/2405.11077
The Baryon Acoustic Oscillations (BAO) phenomenon provides a unique opportunity to establish a standard ruler at any epoch in the history of the evolving universe. The key lies in identifying a suitable cosmological tracer to conduct the measurement.
Externí odkaz:
http://arxiv.org/abs/2404.00747
This is a model-independent analysis that investigates the statistical isotropy in the Local Universe using the ALFALFA survey data ($0 < z < 0.06$). We investigate the angular distribution of HI extra-galactic sources from the ALFALFA catalogue and
Externí odkaz:
http://arxiv.org/abs/2312.03152
Alternative cosmological models have been proposed to alleviate the tensions reported in the concordance cosmological model, or to explain the current accelerated phase of the universe. One way to distinguish between General Relativity and modified g
Externí odkaz:
http://arxiv.org/abs/2311.14216
We investigate the transition scale to homogeneity, $R_H$, using as cosmic tracer the spectroscopic sample of blue galaxies from the Sloan Digital Sky Survey (SDSS). Considering the spatial distribution of the galaxy sample we compute the two point c
Externí odkaz:
http://arxiv.org/abs/2310.04594
Publikováno v:
EPJC 84, 114 (2024)
Nowadays, efforts are being devoted to the study of alternative cosmological scenarios in which modifications of General Relativity have been proposed to explain the late cosmic acceleration without assuming the existence of dark energy. In this scen
Externí odkaz:
http://arxiv.org/abs/2305.06392
The knowledge of the main features of the bulk flow in the Local Universe is important for a better determination of the relative motions there, an information that would contribute to a precise calculation of the Hubble-Lema\^{\i}tre law at very low
Externí odkaz:
http://arxiv.org/abs/2302.04978
Publikováno v:
Phys. Rev. D 107, 103531 (2023)
We explore observational constraints on a cosmological model with an interaction between dark energy (DE) and dark matter (DM), using a compilation of 15 measurements of the 2D BAO (i.e., transversal) scale in combination with Planck-CMB data, to exp
Externí odkaz:
http://arxiv.org/abs/2301.06097