Challenges to the standard cosmological model in recent cosmological observations

• Applicant: Professor Dr. Luca Amendola
• Subject Area: Astrophysics and Astronomy ; Nuclear and Elementary Particle Physics, Quantum Mechanics, Relativity, Fields
• Term: from 2019 to 2021
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 415335479

• Final Report Year: 2022

Final Report Abstract

Main scientific results: • we have shown that a form of modification of gravity can alleviate or solve a long-standing tension in cosmological data • we have shown that a model that has been widely discussed in literature is too much constrained to solve the above-mentioned tension • we have performed a detailed study of the well-known and often investigated "early dark energy” model and shown its limitations in confronting real data, also pointing out to how to improve it • we have provided a new methodology to perform numericaly demanding statistical analyises and released a publicly available code • we have investigated a novel form of screening mechanism and discussed its problems. Most of these advances formed the bases of further work. In the course of this project we published seven paper on international refereed journals and contributed to five "white papers”, all posted in public archives.

Publications

• Brans–Dicke Gravity with a Cosmological Constant Smoothes Out ΛCDM Tensions. The Astrophysical Journal Letters, 886(1), L6.
  Peracaula, Joan Solà; Gómez-Valent, Adrià; de Cruz Pérez, Javier & Moreno-Pulido, Cristian
  
• Boosting Monte Carlo sampling with a non-Gaussian fit. Monthly Notices of the Royal Astronomical Society, 498(1), 181-193.
  Amendola, Luca & Gómez-Valent, Adrià
  
• Brans–Dicke cosmology with a Λ-term: a possible solution to ΛCDM tensions*. Classical and Quantum Gravity, 37(24), 245003.
  Peracaula, Joan Solà; Gómez-Valent, Adrià; de Cruz Pérez, Javier & Moreno-Pulido, Cristian
  
• Update on coupled dark energy and the H0 tension. Physical Review D, 101(12).
  Gómez-Valent, Adrià; Pettorino, Valeria & Amendola, Luca
  
• Cosmology intertwined III: f σ8 and S8. Astroparticle Physics, 131, 102604.
  Di, Valentino Eleonora; Anchordoqui, Luis A.; Akarsu, Özgür; Ali-Haimoud, Yacine; Amendola, Luca; Arendse, Nikki; Asgari, Marika; Ballardini, Mario; Basilakos, Spyros; Battistelli, Elia; Benetti, Micol; Birrer, Simon; Bouchet, François R.; Bruni, Marco; Calabrese, Erminia; Camarena, David; Capozziello, Salvatore; Chen, Angela; Chluba, Jens; ... & Yang, Weiqiang
  
• Difficulties in reconciling non-negligible differences between the local and cosmological values of the gravitational coupling in extended Brans-Dicke theories. Journal of Cosmology and Astroparticle Physics, 2021(09), 040.
  Gómez-Valent; Adrià; Hassan, Puttasiddappa & Prajwal
  
• Early dark energy in the pre- and postrecombination epochs. Physical Review D, 104(8).
  Gómez-Valent, Adrià; Zheng, Ziyang; Amendola, Luca; Pettorino, Valeria & Wetterich, Christof
  
• Running vacuum against the H 0 and σ8 tensions. Europhysics Letters, 134(1), 19001.
  Solà, Peracaula; Joan; Gómez-Valent; Adrià; de Cruz Pérez, Javier; Moreno-Pulido & Cristian
  
• Snowmass2021 - Letter of interest cosmology intertwined II: The hubble constant tension. Astroparticle Physics, 131, 102605.
  Di, Valentino Eleonora; Anchordoqui, Luis A.; Akarsu, Özgür; Ali-Haimoud, Yacine; Amendola, Luca; Arendse, Nikki; Asgari, Marika; Ballardini, Mario; Basilakos, Spyros; Battistelli, Elia; Benetti, Micol; Birrer, Simon; Bouchet, François R.; Bruni, Marco; Calabrese, Erminia; Camarena, David; Capozziello, Salvatore; Chen, Angela; Chluba, Jens; ... & Yang, Weiqiang
  
• Early and not so early dark energy. What do cosmological observations tell us about them?. The Sixteenth Marcel Grossmann Meeting (2023, 1, 24), 1713-1732. American Geophysical Union (AGU).
  Gómez-Valent, Adrià; Zheng, Ziyang; Amendola, Luca; Pettorino, Valeria & Wetterich, Christof