E. Di Valentino, Luis A. Anchordoqui, Özgür Akarsu, Yacine Ali-Haimoud, L. Amendola, Nikki Arendse, Marika Asgari, M. Ballardini, S. Basilakos, E. Battistelli, M. Benetti, Simon Birrer, F. R. Bouchet, M. Bruni, E. Calabrese, David Camarena, S. Capozziello, Angela Chen, J. Chluba, Anton Chudaykin, Eoin Ó. Colgáin, Francis-Yan Cyr-Racine, P. de Bernardis, Javier de Cruz Pérez, J. Delabrouille, Celia Escamilla-Rivera, A. Ferté, F. Finelli, Wendy Freedman, N. Frusciante, E. Giusarma, Adriŕ Gómez-Valent, W. Handley, I. Harrison, Luke Hart, Alan Heavens, H. Hildebrandt, Daniel Holz, D. Huterer, Mikhail M. Ivanov, Shahab Joudaki, M. Kamionkowski, Tanvi Karwal, L. Knox, Suresh Kumar, L Lamagna, J. Lesgourgues, Matteo Lucca, V. Marra, S. Masi, S. Matarrese, A. Mazumdar, A. Melchiorri, Olga Mena, Laura Mersini-Houghton, Vivian Miranda, Cristian Moreno-Pulido, D. F. Mota, J. Muir, Ankan Mukherjee, Florian Niedermann, Notari, Rafael C. Nunes, F. Pace, A. Paliathanasis, A. Palmese, Supriya Pan, D. Paoletti, V. Pettorino, F. Piacentini, V. Poulin, M. Raveri, A. G. Riess, V. Salzano, E. N. Saridakis, A. Sen, A. Shafieloo, Anowar J. Shajib, J. Silk, A. Silvestri, Martin S. Sloth, Tristan L. Smith, Joan Solŕ Peracaula, C. van de Bruck, L. Verde, Luca Visinelli, B. D. Wandelt, D. Wang, Jian-Min Wang, Anil K. Yadav, W. Yang
A precise measurement of the curvature of the Universe is of prime importance for cosmology since it could not only confirm the paradigm of primordial inflation but also help in discriminating between different early-Universe scenarios. Recent observations, while broadly consistent with a spatially flat standard Λ Cold Dark Matter (ΛCDM) model, show tensions that still allow (and, in some cases, even suggest) a few percent deviations from a flat universe. In particular, the Planck Cosmic Microwave Background power spectra, assuming the nominal likelihood, prefer a closed universe at more than 99% confidence level. While new physics could be at play, this anomaly may be the result of an unresolved systematic error or just a statistical fluctuation. However, since positive curvature allows a larger age of the Universe, an accurate determination of the age of the oldest objects provides a smoking gun in confirming or falsifying the current flat ΛCDM model.
Astrophysics - Cosmology and Nongalactic Astrophysics; High Energy Physics - Phenomenology
Volume 131, Number 1026