Cosmology without assuming a cosmology: data analysis in the Euclid era

• Applicant: Professor Dr. Luca Amendola
• Subject Area: Astrophysics and Astronomy ; Nuclear and Elementary Particle Physics, Quantum Mechanics, Relativity, Fields
• Term: from 2021 to 2024
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 456622116

• Final Report Year: 2024

Final Report Abstract

Main scientific results: We have produced and made publicly available a code to produce model-independent forecasts with non-linear spectra and bispectra. • We have shown that it is possible to obtain strong constraints on several fundamental cosmic parameters (e.g. spatial curvature, expansion rate, modified gravity parameters) without assuming specific models. • We have included for the first time in the forecasts general kernels that go beyond the usual Einstein-deSitter or ΛCDM form. • We have shown that standard candles and standard sirens can act as clustering and peculiar velocity tracers, and contribute significantly to cosmological statistics. • We have produce a frequentist alternative to model comparison that avoids several issues of the standard Bayesian approach. • We have shown that cosmic voids are not sufficient to solve the H0 tension.

Publications

• A Short Review on the Latest Neutrinos Mass and Number Constraints from Cosmological Observables. Universe, 8(5), 284.
  Sakr, Ziad
  
• A void in the Hubble tension? The end of the line for the Hubble bubble. Classical and Quantum Gravity, 39(18), 184001.
  Camarena, David; Marra, Valerio; Sakr, Ziad & Clarkson, Chris
  
• Coupled and uncoupled early dark energy, massive neutrinos, and the cosmological tensions. Physical Review D, 106(10).
  Gómez-Valent, Adrià; Zheng, Ziyang; Amendola, Luca; Wetterich, Christof & Pettorino, Valeria
  
• Fisher matrix for the one-loop galaxy power spectrum: measuring expansion and growth rates without assuming a cosmological model. Journal of Cosmology and Astroparticle Physics, 2022(11), 023.
  Amendola, Luca; Pietroni, Massimo & Quartin, Miguel
  
• Skewness as a test of dark energy perturbations. Physical Review D, 105(10).
  Fazolo, Raquel Emy; Amendola, Luca & Velten, Hermano
  
• The lure of sirens: joint distance and velocity measurements with third-generation detectors. Monthly Notices of the Royal Astronomical Society, 517(4), 5449-5462.
  Alfradique, Viviane; Quartin, Miguel; Amendola, Luca; Castro, Tiago & Toubiana, Alexandre
  
• A trium test on beyond ΛCDM triggering parameters. Journal of Cosmology and Astroparticle Physics, 2023(08), 080.
  Sakr, Z.
  
• Constraining Horndeski theory with gravitational waves from coalescing binaries. Journal of Cosmology and Astroparticle Physics, 2023(08), 049.
  Quartin, Miguel; Tsujikawa, Shinji; Amendola, Luca & Sturani, Riccardo
  
• Extensions to ΛCDM at Intermediate Redshifts to Solve the Tensions ?. Proceedings of Corfu Summer Institute 2022 "School and Workshops on Elementary Particle Physics and Gravity" — PoS(CORFU2022), 262. Sissa Medialab.
  Sakr, Ziad
  
• Testing the hypothesis of a matter density discrepancy within ΛCDM model using multiple probes. Physical Review D, 108(8).
  Sakr, Ziad
  
• Untying the Growth Index to Relieve the σ8 Discomfort. Universe, 9(8), 366.
  Sakr, Ziad
  
• A model-independent tripartite test of cosmic distance relations. Journal of Cosmology and Astroparticle Physics, 2024(08), 007.
  Matos, Isabela; Quartin, Miguel; Amendola, Luca; Kunz, Martin & Sturani, Riccardo
  
• Constraining ΛLTB models with galaxy cluster counts from next-generation surveys. Astronomy & Astrophysics, 683, A230.
  Sakr, Z.; Carvalho, A.; Da Silva, A.; García-Bellido, J.; Mimoso, J. P.; Camarena, D.; Nesseris, S.; Martins, C. J. A. P.; Nunes, N. & Sapone, D.
  
• Constraints on cosmologically coupled black holes from gravitational wave observations and minimal formation mass. Monthly Notices of the Royal Astronomical Society, 528(2), 2377-2390.
  Amendola, Luca; Rodrigues, Davi C.; Kumar, Sumit & Quartin, Miguel
  
• Distribution of Bayes’ factor. Physical Review D, 110(12).
  Amendola, Luca; Patel, Vrund; Sakr, Ziad; Sellentin, Elena & Wolz, Kevin
  
• Improving precision and accuracy in cosmology with model-independent spectrum and bispectrum. Journal of Cosmology and Astroparticle Physics, 2024(01), 001.
  Amendola, Luca; Marinucci, Marco; Pietroni, Massimo & Quartin, Miguel
  
• Investigating the Hubble tension and σ 8 discrepancy in f(Q) cosmology. Journal of Cosmology and Astroparticle Physics, 2024(10), 052.
  Sakr, Ziad & Schey, Leonid
  
• Testing the cosmological Poisson equation in a model-independent way. Physics Letters B, 853, 138647.
  Zheng, Ziyang; Sakr, Ziad & Amendola, Luca
  
• Cosmological Spatial Curvature with the Alcock-Paczyński Effect. Physical Review Letters, 134(10).
  Amendola, Luca; Marinucci, Marco & Quartin, Miguel