Zobrazeno 1 - 10
of 170
pro vyhledávání: '"Quartin , Miguel"'
Autor:
Ferri, João, Tashiro, Ian L., Abramo, L. Raul, Matos, Isabela, Quartin, Miguel, Sturani, Riccardo
Observations of gravitational waves (GWs) from dark sirens allow us to infer their locations and distances. Galaxies, on the other hand, have precise angular positions but no direct measurement of their distances -- only redshifts. The cross-correlat
Externí odkaz:
http://arxiv.org/abs/2412.00202
Cosmological data collected on a sphere, such as CMB anisotropies, are typically represented by the spherical harmonic coefficients, denoted as $a_{\ell m}$. The angular power spectrum, or $C_\ell$, serves as the fundamental estimator of the variance
Externí odkaz:
http://arxiv.org/abs/2411.08087
With the increasing precision of recent cosmological surveys and the discovery of important tensions within the $\Lambda$CDM paradigm, it is becoming more and more important to develop tools to quantify accurately the discordance between different pr
Externí odkaz:
http://arxiv.org/abs/2408.08385
In this work we provide a data analysis of the BOSS galaxy clustering data with the recently proposed FreePower method, which adopts as parameters the power spectrum band-powers, the expansion rate, and the growth rate instead of specific cosmologica
Externí odkaz:
http://arxiv.org/abs/2406.15347
Autor:
Alfradique, Viviane, Castro, Tiago, Marra, Valerio, Quartin, Miguel, Giocoli, Carlo, Monaco, Pierluigi
Publikováno v:
The Open Journal of Astrophysics 7 (October) 2024
Gravitational lensing is a crucial tool for exploring cosmic phenomena, providing insights into galaxy clustering, dark matter, and dark energy. Given the substantial computational demands of $N$-body simulations, approximate methods like $\texttt{PI
Externí odkaz:
http://arxiv.org/abs/2405.00147
We propose a methodology to measure the cosmological spatial curvature by employing the deviation from statistical isotropy due to the Alcock-Paczy\'nski effect of large scale galaxy clustering. This approach has a higher degree of model independence
Externí odkaz:
http://arxiv.org/abs/2404.13124
Tensions between cosmological parameters derived through different channels can be a genuine signature of new physics that $\Lambda$CDM as the standard model is not able to reproduce, in particular in the missing consistency between parameter estimat
Externí odkaz:
http://arxiv.org/abs/2402.19100
Publikováno v:
JCAP08(2024)007
Cosmological distances are fundamental observables in cosmology. The luminosity ($D_L$), angular diameter ($D_A$) and gravitational wave ($D_{\rm GW}$) distances are all trivially related in General Relativity assuming no significant absorption of ph
Externí odkaz:
http://arxiv.org/abs/2311.17176
Publikováno v:
MNRAS, 528 (2024) 2
We test the possibility that the black holes (BHs) detected by LIGO-Virgo-KAGRA (LVK) may be cosmologically coupled and grow in mass proportionally to the cosmological scale factor to some power $k$, which may also act as the dark energy source if $k
Externí odkaz:
http://arxiv.org/abs/2307.02474
Publikováno v:
JCAP 01(2024)001
A new and promising avenue was recently developed for analyzing large-scale structure data with a model-independent approach, in which the linear power spectrum shape is parametrized with a large number of freely varying wavebands rather than by assu
Externí odkaz:
http://arxiv.org/abs/2307.02117