Impact of theoretical assumptions in the determination of the neutrino effective number from future CMB measurements

Capparelli, L.M.; Valentino, Eleonora Di; Melchiorri, A.; Chluba, Jens

doi:10.1103/physrevd.97.063519

Cited by 11 publications

(8 citation statements)

References 49 publications

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“…Finally, the neutron lifetime has profound consequences for nuclear physics and astrophysics, e.g., it affects the primordial helium production during nucleosynthesis [48] and impacts the neutrino effective number determined from the cosmic microwave background [49]. If the neutron dark decay channel we propose is the true explanation for the difference in the results of bottle and beam experiments, then the correct value for the neutron lifetime is τ n 880 s.…”

Section: Discussionmentioning

confidence: 89%

Dark Matter Interpretation of the Neutron Decay Anomaly

2018

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There is a long-standing discrepancy between the neutron lifetime measured in beam and bottle experiments. We propose to explain this anomaly by a dark decay channel for the neutron, involving one or more dark sector particles in the final state. If any of these particles are stable, they can be the dark matter. We construct representative particle physics models consistent with all experimental constraints.

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Section: Discussionmentioning

confidence: 89%

Dark Matter Interpretation of the Neutron Decay Anomaly

2018

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“…Refs. [68][69][70][71][72][73][74][75]. The fiducial cosmology is a vanilla flat ΛCDM model compatible with Planck TT,TE,EE + lowE measurements, and therefore with a null coupling between Dark Matter and Dark Energy.…”

Section: Methodsmentioning

confidence: 76%

A fake Interacting Dark Energy detection?

Di Valentino,

Mena

2020

Preprint

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Models involving an interaction between the Dark Matter and the Dark Energy sectors have been proposed to alleviate the long standing Hubble constant tension. In this paper we analyze whether the constraints and potential hints obtained for these interacting models remain unchanged when using simulated Planck data. Interestingly, our simulations indicate that a dangerous fake detection for a non-zero interaction among the Dark Matter and the Dark Energy fluids could arise when dealing with current CMB Planck measurements alone. The very same hypothesis is tested against future CMB observations, finding that only cosmic variance limited polarization experiments, such as PICO or PRISM, could be able to break the existing parameter degeneracies and provide reliable cosmological constraints. This paper underlines the extreme importance of confronting the results arising from data analyses with those obtained with simulations when extracting cosmological limits within exotic cosmological scenarios.

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“…A stage-III experiment in two possible configurations as in [24], i.e., a wide experiment similar to AdvACT and a deep experiment similar to SPT-3G. Finally we consider the possibility of a stage-IV experiment as in [24] (but see also [25,29]). …”

Section: Methodsmentioning

confidence: 99%

Cornering the Planck Alens tension with future CMB data

2018

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The precise measurements of cosmic microwave background (CMB) anisotropy angular power spectra made by the Planck satellite show an anomalous value for the lensing amplitude, defined by the parameter A lens , at about 2 standard deviations (2.6 standard deviations when cosmic shear data are included). Moreover, considering A lens brings the values of the cosmological parameters determined by Planck in better agreement with those found by pre-Planck data sets. In this paper, after discussing the current status of the anomaly, we quantify the potential of future CMB measurements in confirming/falsifying the A lens tension. We find that a space-based experiment such as LiteBIRD could falsify the current A lens tension at the level of 5 standard deviations. Similar constraints can be achieved by a stage-III experiment assuming an external prior on the reionization optical depth of τ ¼ 0.055 AE 0.010 as already provided by the Planck satellite. A stage-IV experiment could further test the A lens tension at the level of 10 standard deviations. A comparison between temperature and polarization measurements made at different frequencies could further identify possible systematics responsible for A lens > 1. We show that, in the case of the CMB-S4 experiment, polarization data alone have the potential of falsifying the current A lens anomaly at more than 5 standard deviations and to strongly bound its frequency dependence. We also evaluate the future constraints on a possible scale dependence for A lens .

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Impact of theoretical assumptions in the determination of the neutrino effective number from future CMB measurements

Cited by 11 publications

References 49 publications

Dark Matter Interpretation of the Neutron Decay Anomaly

Dark Matter Interpretation of the Neutron Decay Anomaly

A fake Interacting Dark Energy detection?

Cornering the Planck Alens tension with future CMB data

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