Using Neutrino Oscillations to Measure $H_0$

Khalifeh, Ali Rida; Jimenez, Raul

doi:10.48550/arxiv.2111.15249

Cited by 3 publications

(3 citation statements)

References 37 publications

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“…Gravitational induced neutrinoantineutrino oscillations have also been investigated [36,37]. Neutrino oscillations have also been studied in the cosmological context to distinguish dark energy models and measure H 0 in [38,39], where H 0 is the current value of the Hubble parameter.…”

Section: Introductionmentioning

confidence: 99%

Neutrino flavor oscillations in a rotating spacetime

Swami

2022

Eur. Phys. J. C

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We study neutrino oscillations in a rotating spacetime under the weak gravity limit for the trajectories of neutrinos which are constrained in the equatorial plane. Using the asymptotic form of the Kerr metric, we show that the rotation of the gravitational source non-trivially modifies the neutrino phase. We find that the oscillation probabilities deviate significantly from the corresponding results in the Schwarzschild spacetime when neutrinos are produced near the black hole (still in the weak-gravity limit) with non-zero angular momentum and detected on the same side, i.e., the non-lensed neutrino. Moreover, for a given gravitational body and geometric parameters, there exists a distance scale for every energy scale (and vice versa), after which the rotational contribution in the neutrino phase becomes significant. Using the sun-sized gravitational body in the numerical analysis of the one-sided neutrino propagation, we show that even a small rotation of the gravitational object can significantly change the survival or appearance events of a neutrino flavor registered by the detector, which is located on the earth. These effects are expected to be prominent for cosmological/astrophysical scenarios where neutrinos travel past by many (rotating) gravitational bodies and for large distances. Thus rotational effects of all such bodies must be incorporated in analyzing oscillations data.

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Section: Introductionmentioning

confidence: 99%

Neutrino flavor oscillations in a rotating spacetime

Swami

2022

Eur. Phys. J. C

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“…For recent reviews on the Hubble constant problem and its solutions, see [120][121][122][123][124][125][126][127][128][129]. The σ 8 tension refers to the ∼2σ deviation between CMB observations and weak gravitational lensing data on the clustering of matter at scales of 8 h/Mpc [142].…”

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confidence: 99%

Two Sides of the Same Coin: Sterile Neutrinos and Dark Radiation, Status and Perspectives

Archidiacono

Gariazzo

2022

Universe

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The presence of light sterile neutrinos is one of the unanswered questions of particle physics. The cosmological counterpart is represented by dark radiation, i.e., any form of radiation present in the early Universe besides photons and standard (active) neutrinos. This short review provides a comprehensive overview of the two problems and of their connection. We review the status of neutrino oscillation anomalies, commenting on the most recent oscillation data and their mutual tensions, and we discuss the constraints from other terrestrial probes. We show the shortcomings of translating light sterile neutrinos in cosmology as additional thermalised relativistic species, produced by neutrino oscillations, and we detail alternative solutions, specifically focusing on neutrino nonstandard interactions, and on their link to the Hubble constant problem. The impact of a new force leading to dark radiation–dark matter interactions is also discussed in the realm of new physics in the dark sector.

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“…In a recent publication it was entertained the possibility of using neutrino oscillations as a probe of the Hubble tension [1]. In this comment we show that such a task is unfeasible because for typical energies of cosmic neutrinos, oscillations average out over cosmological distances and so the oscillation probability depends only on the angles of the Pontecorvo-Maki-Nagakawa-Sakata (PMNS) matrix [2][3][4].…”

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confidence: 99%