Hot new early dark energy: Towards a unified dark sector of neutrinos, dark energy and dark matter

Niedermann, Florian; Sloth, Martin S.

doi:10.1016/j.physletb.2022.137555

Cited by 30 publications

(27 citation statements)

References 150 publications

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“…A phenomenological EDE model is given by a scalar field, ϕ, with potential (see [968,987] for some alternatives)…”

Section: Early Dark Energymentioning

confidence: 99%

String Cosmology: from the Early Universe to Today

Cicoli¹,

Conlon²,

Maharana³

et al. 2023

Preprint

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We review applications of string theory to cosmology, from primordial times to the present-day accelerated expansion. Starting with a brief overview of cosmology and string compactifications, we discuss in detail moduli stabilisation, inflation in string theory, the impact of string theory on post-inflationary dynamics (reheating, moduli domination, kination), dark energy (the cosmological constant from a string landscape and models of quintessence) and various alternative scenarios (string/brane gases, the pre big-bang scenario, rolling tachyons, ekpyrotic/cyclic cosmologies, bubbles of nothing, S-brane and holographic cosmologies). The state of the art in string constructions is described in each topic and, where relevant, connections to swampland conjectures are made. The possibilities for novel particles and excitations (axions, moduli, cosmic strings, branes, solitons, oscillons and boson stars) are emphasised. Implications for the physics of the CMB, gravitational waves, dark matter and dark radiation are discussed along with potential observational signatures.

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“…A phenomenological EDE model is given by a scalar field, ϕ, with potential (see [968,987] for some alternatives)…”

Section: Early Dark Energymentioning

confidence: 99%

String Cosmology: from the Early Universe to Today

Cicoli¹,

Conlon²,

Maharana³

et al. 2023

Preprint

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“…10 Therefore, the Hot NEDE model also does not contain an ultra-light trigger field. Instead, the Hot NEDE model contains interactions between dark matter and dark radiation, which can lead to a different simultaneous solution to the H0 and S8 tensions [23,24] (see also [73]).…”

Section: B Cold Nede Field Perturbationsmentioning

confidence: 99%

“…It has been established that New Early Dark Energy (NEDE) is a natural and promising solution to the notorious Hubble tension [20][21][22][23][24][25][26][27] and remains compatible with measurements of large-scale structure (LSS) [22,26] (for other adaptions of NEDE see also [28,29]). So far, it has shared this phenomenological success with its predecessor Early Dark Energy (EDE) [30][31][32][33][34], although both models rely on different microphysics and lead to different predictions at the more detailed level (for further EDE-type models and explorations see [28,29,[35][36][37][38][39][40][41][42][43][44][45][46][47][48][49] and for reviews [50,51]).…”

Section: Introductionmentioning

confidence: 99%

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A grounded perspective on new early dark energy using ACT, SPT, and BICEP/Keck

Cruz

Niedermann

Sloth

2023

J. Cosmol. Astropart. Phys.

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We examine further the ability of the New Early Dark Energy model (NEDE) to resolve the current tension between the Cosmic Microwave Background (CMB) and local measurements of H 0 and the consequences for inflation. We perform new Bayesian analyses, including the current datasets from the ground-based CMB telescopes Atacama Cosmology Telescope (ACT), the South Pole Telescope (SPT), and the BICEP/Keck telescopes, employing an updated likelihood for the local measurements coming from the SH 0ES collaboration. Using the SH 0ES prior on H 0, the combined analysis with Baryonic Acoustic Oscillations (BAO), Pantheon, Planck and ACT improves the best-fit by Δχ 2 = -15.9 with respect to ΛCDM, favors a non-zero fractional contribution of NEDE, fNEDE > 0, by 4.8σ, and gives a best-fit value for the Hubble constant of H 0 = 72.09 km/s/Mpc (mean 71.49 ± 0.82 with 68% C.L.). A similar analysis using SPT instead of ACT yields consistent results with a Δχ 2 = -23.1 over ΛCDM, a preference for non-zero f NEDE of 4.7σ and a best-fit value of H0 = 71.77 km/s/Mpc (mean 71.43 ± 0.85 with 68% C.L.). We also provide the constraints on the inflation parameters r and ns coming from NEDE, including the BICEP/Keck 2018 data, and show that the allowed upper value on the tensor-scalar ratio is consistent with the ΛCDM bound, but, as also originally found, with a more blue scalar spectrum implying that the simplest curvaton model is now favored over the Starobinsky inflation model.

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“…In particular, the recent CMB measurements gives the value of present day Hubble constant H 0 = 67.27 ± 0.60 km/s/Mpc −1 [4] while the analysis based on Cepheidcalibrated Type Ia supernovae by the SH0ES collaboration gives H 0 = 74.03 ± 1.42 km/s/Mpc −1 [5,6]. While the tension might exist due to issues in systematic, several solutions have been proposed to address this by proposing modification either in the early universe or the late-universe physics [1][2][3][7][8][9][10][11]. All these solutions are based on obtaining the high value of H 0 from CMB based measurements.…”

mentioning

confidence: 99%

Synergy Between Hubble Tension Motivated Self-Interacting Neutrino and KeV-Sterile Neutrino Dark Matter

Dhuria¹,

Abinas²

2023

Preprint

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The discrepancy between the value of Hubble constant measured by CMB observations and local low-redshift based observations has proposed many solutions which require the existence of Physics beyond Standard Model (SM). One of the interesting solutions is based on considering the strong self-interaction between Standard Model (SM) neutrinos through an additional scalar/vector mediator. Interestingly, the strong self-interaction between SM neutrinos also play an important role in obtaining KeV-sterile neutrino as a viable Dark Matter (DM) candidate through the famous Dodelson-Widrow mechanism. In this work, we have tried to find the synergy between the parameter space of active-sterile neutrino mixing vs mass of sterile neutrino allowed by Hubble tension solution and the requirement of getting KeV-sterile neutrino as DM candidate. Interestingly, we get a large amount of parameter space that is consistent with both the requirements and also free from X-Ray constraints. Finally, we have embedded this scenario in a consistent supersymmetric model of particle physics. In this framework, we have shown that the value of sterile neutrino mass, SM neutrino mass and the required mixing angle can be naturally obtained by considering the supersymmetry breaking scale to be around O(10) TeV. Thus, it would give an interesting testing ground for supersymmetry as well as signatures of Warm Dark Matter (WDM).

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Hot new early dark energy: Towards a unified dark sector of neutrinos, dark energy and dark matter

Cited by 30 publications

References 150 publications

String Cosmology: from the Early Universe to Today

String Cosmology: from the Early Universe to Today

A grounded perspective on new early dark energy using ACT, SPT, and BICEP/Keck

Synergy Between Hubble Tension Motivated Self-Interacting Neutrino and KeV-Sterile Neutrino Dark Matter

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