CINECA IRIS Institutional Research Information System
IRIS è la soluzione IT che facilita la raccolta e la gestione dei dati relativi alle attività e ai prodotti della ricerca. Fornisce a ricercatori, amministratori e valutatori gli strumenti per monitorare i risultati della ricerca, aumentarne la visibilità e allocare in modo efficace le risorse disponibili.
EnglishSecret contact interactions among eV sterile neutrinos, mediated by a massive gauge boson X (with MX⪠MW), and characterized by a gauge coupling gX, have been proposed as a mean to reconcile cosmological observations and short-baseline laboratory anomalies. We constrain this scenario using the latest Planck data on Cosmic Microwave Background anisotropies, and measurements of baryon acoustic oscillations (BAO). We consistently include the effect of secret interactions on cosmological perturbations, namely the increased density and pressure fluctuations in the neutrino fluid, and still find a severe tension between the secret interaction framework and cosmology. In fact, taking into account neutrino scattering via secret interactions, we derive our own mass bound on sterile neutrinos and find (at 95 % CL) ms< 0.82 eV or ms< 0.29 eV from Planck alone or in combination with BAO, respectively. These limits confirm the discrepancy with the laboratory anomalies. Moreover, we constrain, in the limit of contact interaction, the effective strength GXto be < 2.8 (2.0) à 1010GFfrom Planck (Planck+BAO). This result, together with the mass bound, strongly disfavours the region with MXâ¼ 0.1 MeV and relatively large coupling gXâ¼10-1, previously indicated as a possible solution to the small scale dark matter problem.
| Data di pubblicazione: | 2017 | |
| Titolo: | Cosmic microwave background constraints on secret interactions among sterile neutrinos | |
| Autori: | Forastieri, Francesco; Lattanzi, Massimiliano; Mangano, Gianpiero; Mirizzi, Alessandro; Natoli, Paolo; Saviano, Ninetta | |
| Rivista: | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | |
| Keywords: | cosmological neutrinos; cosmological parameters from CMBR; neutrino masses from cosmology; neutrino properties; Astronomy and Astrophysics | |
| Abstract in inglese: | Secret contact interactions among eV sterile neutrinos, mediated by a massive gauge boson X (with MX⪠MW), and characterized by a gauge coupling gX, have been proposed as a mean to reconcile cosmological observations and short-baseline laboratory anomalies. We constrain this scenario using the latest Planck data on Cosmic Microwave Background anisotropies, and measurements of baryon acoustic oscillations (BAO). We consistently include the effect of secret interactions on cosmological perturbations, namely the increased density and pressure fluctuations in the neutrino fluid, and still find a severe tension between the secret interaction framework and cosmology. In fact, taking into account neutrino scattering via secret interactions, we derive our own mass bound on sterile neutrinos and find (at 95 % CL) ms< 0.82 eV or ms< 0.29 eV from Planck alone or in combination with BAO, respectively. These limits confirm the discrepancy with the laboratory anomalies. Moreover, we constrain, in the limit of contact interaction, the effective strength GXto be < 2.8 (2.0) à 1010GFfrom Planck (Planck+BAO). This result, together with the mass bound, strongly disfavours the region with MXâ¼ 0.1 MeV and relatively large coupling gXâ¼10-1, previously indicated as a possible solution to the small scale dark matter problem. | |
| Digital Object Identifier (DOI): | 10.1088/1475-7516/2017/07/038 | |
| Handle: | http://hdl.handle.net/11392/2383822 | |
| Appare nelle tipologie: | 03.1 Articolo su rivista |
File in questo prodotto:
| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| 2017.cosmic microwave.pdf | versione editoriale | Full text (versione editoriale) | NON PUBBLICO - Accesso privato/ristretto | Administrator Richiedi una copia |
| 1704.00626.pdf | pre print | Pre-print | PUBBLICO - Pubblico con Copyright | Open Access Visualizza/Apri |
http://hdl.handle.net/11392/2383822
Copyright © 2022