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Valentino, Eleonora Di; Anchordoqui, Luis A.; Akarsu, Özgür; Ali-Haı̈moud, Yacine; Amendola, Luca; Arendse, Nikki; Asgari, Marika; Ballardini, M.; Basilakos, Spyros; Battistelli, E. S.; Benetti, Micol; Birrer, Simon; Bouchet, F. R.; Bruni, Marco; Calabrese, E.; Camarena, David; Capozziello, Salvatore; Chen, A.; Chluba, Jens; Chudaykin, Anton; Colgáin, Eoin Ó; Cyr-Racine, Francis-Yan; Bernardis, P. de; Pérez, Javier de Cruz; Delabrouille, J.; Dunkley, Jo; Escamilla-Rivera, Celia; Ferté, A.; Finelli⋆, F.; Freedman, Wendy L.; Frusciante, Noemi; Giusarma, Elena; Gómez-Valent, Adrià; Handley, Will; Harrison, I.; Hart, Luke; Heavens, Alan; Hildebrandt, Hendrik; Holz, D. E.; Huterer, Dragan; Ivanov, Mikhail M.; Joudaki, Shahab; Kamionkowski, Marc; Karwal, Tanvi; Knox, L.; Kumar, Suresh; Lamagna, L.; Lesgourgues, Julien; Lucca, Matteo; Marra, Valerio; Masi, S.; Matarrese, S.; Mazumdar, Arindam; Melchiorri, A.; Mena, Olga; Mersini-Houghton, Laura; Miranda, Vivian; Moreno-Pulido, Cristian; Mota, David F.; Muir, J.; Mukherjee, Ankan; Niedermann, Florian; Notari, Alessio; Nunes, Rafael C.; Pace, Francesco; Paliathanasis, Andronikos; Palmese, A.; Pan, Supriya; Paoletti, D.; Pettorino, V.; Piacentini, F.; Poulin, Vivian; Raveri, Marco; Riess, Adam G.; Salzano, Vincenzo; Saridakis, Emmanuel N.; Sen, Anjan A.; Shafieloo, Arman; Shajib, Anowar J.; Silk, Joseph; Silvestri, Alessandra; Sloth, Martin S.; Smith, Tristan L.; Peracaula, Joan Solà; Bruck, Carsten van de; Verde, Licia; Visinelli, Luca; Wandelt, B. D.; Wang, Deng; Wang, Jianmin; Yadav, Anil Kumar; Yang, Weiqiang

doi:10.1016/j.astropartphys.2021.102604

Cited by 231 publications

(73 citation statements)

References 118 publications

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“…To be specific, it was shown that NEDE in its simplest form predicts matter to be too clumpy on short scales -quantified by the parameter S 8 . However, this so-called S 8 tension is already present within the ΛCDM model at the 2 to 3σ level [57], and it was found that NEDE is not making it worse. In fact, even when including LSS data, NEDE maintains its strong statistical evidence of 4σ.…”

Section: B Phenomenologymentioning

confidence: 99%

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New early dark energy

2021

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New measurements of the expansion rate of the Universe have plunged the standard model of cosmology into a severe crisis. In this paper, we propose a simple resolution to the problem that relies on a first order phase transition in a dark sector in the early Universe, before recombination. This will lead to a short phase of a new early dark energy (NEDE) component and can explain the observations. We model the false vacuum decay of the NEDE scalar field as a sudden transition from a cosmological constant source to a decaying fluid with constant equation of state. The corresponding fluid perturbations are covariantly matched to the adiabatic fluctuations of a subdominant scalar field that triggers the phase transition. Fitting our model to measurements of the cosmic microwave background (CMB), baryonic acoustic oscillations (BAO, and supernovae (SNe) yields a significant improvement of the best fit compared with the standard cosmological model without NEDE. We find the mean value of the present Hubble parameter in the NEDE model to be H 0 ¼ 71.4 AE 1.0 km s −1 Mpc −1 (68% C.L.).

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Section: B Phenomenologymentioning

confidence: 99%

“…This problem, also referred to as the σ 8 tension, is with a significance of 2 to 3σ less severe but still gaining attention in the observational community. It tells us that the ΛCDM model predicts too much power in the linear matter power spectrum on small scales [57].…”

Section: Referencesmentioning

confidence: 99%

New early dark energy

2021

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“…The following abbreviations are used in this manuscript: We can add to these problems the tensions in the Standard Cosmological Model (ΛCDM), like those of σ 8 and H 0 [19,20]. 3 See the result of a renormalizable stress-energy tensor in Section 6.2 of Ref.…”

Section: Acknowledgmentsmentioning

confidence: 99%

The Possibility of a Non-Lagrangian Theory of Gravity

Escamilla-Rivera

Fabris

2021

Universe

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General Relativity resembles a very elegant crystal glass: If we touch its principles, that is, its Lagrangian, there is a risk of breaking everything. Or, if we will, it is like a short blanket: Curing some problems creates new problems. This paper is devoted to bring to light the reasons why we pursue the possibility of a non-Lagrangian theory of gravity under the hypothesis of an extension of the original general relativity with an ansatz inspired in the fundamental principles of classical and quantum physics.

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“…The most statistically significant one is the discrepancy of the Hubble constant extracted from nearby universe probes and that derived from Cosmic Microwave Background (CMB) measurements [12][13][14]. Another one is related to the clustering parameter σ 8 , whose values differ for CMB and weak lensing estimates [15]. The third one, the so-called lensing anomaly [7,16], is the focus of this work.…”

Section: Introductionmentioning

confidence: 97%

Non-standard neutrino cosmology dilutes the lensing anomaly

Esteban¹,

Mena²,

Salvadó³

2022

Preprint

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Despite the impressive success of the standard cosmological model, several anomalies defy its triumph. Among them is the so-called lensing anomaly: the Planck satellite observes stronger CMB gravitational lensing than expected. The role of neutrinos in this anomaly has been mostly overlooked, despite their key role in CMB lensing, because in the standard scenario they tend to increase the tension. Here, we show that this strongly depends on the assumed neutrino equation of state. We demonstrate that if neutrinos have yet undiscovered long-range interactions, the lensing pattern is significantly affected, rendering the lensing anomaly as a pure statistical fluctuation. Our results thus open up a window to link anomalous CMB lensing with present and future cosmological, astrophysical, and laboratory measurements of neutrino properties.

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Cosmology intertwined III: fσ8 and S8

Cited by 231 publications

References 118 publications

New early dark energy

New early dark energy

The Possibility of a Non-Lagrangian Theory of Gravity

Non-standard neutrino cosmology dilutes the lensing anomaly

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