{ "id": "1608.00672", "version": "v1", "published": "2016-08-02T01:47:53.000Z", "updated": "2016-08-02T01:47:53.000Z", "title": "Impacts of dark energy on weighing neutrinos: mass hierarchies considered", "authors": [ "Sai Wang", "Yi-Fan Wang", "Dong-Mei Xia", "Xin Zhang" ], "comment": "6 pages, 3 figures, 3 tables", "categories": [ "astro-ph.CO", "gr-qc", "hep-ph" ], "abstract": "Taking into account the mass splittings between three active neutrinos, we investigate potential impacts of dark energy on constraining the total neutrino mass $\\sum m_{\\nu}$ by using recent cosmological observations. We consider two typical dark energy models, namely, the $w$CDM model and the holographic dark energy (HDE) model, which both have an additional parameter than the $\\Lambda$CDM model. We employ the Planck 2015 data of CMB temperature and polarization anisotropies, combined with low-redshift measurements on BAO distance scales, type Ia supernovae, Hubble constant, and Planck lensing. Comparing with the $\\Lambda$CDM model, our studies show that the upper limit on $\\sum m_{\\nu}$ becomes much looser in the $w$CDM model while much tighter in the HDE model. In the HDE model, we obtain the $95\\%$ CL upper limit $\\sum m_{\\nu}<0.105~\\textrm{eV}$ for three degenerate neutrinos. This might be the most stringent constraint on $\\sum m_{\\nu}$ by far. Even though the minimal $\\chi^2$ is slightly smaller for the normal hierarchy than that for the inverted hierarchy, the difference $\\Delta \\chi^2$ is still not significant enough to distinguish the neutrino mass hierarchies.", "revisions": [ { "version": "v1", "updated": "2016-08-02T01:47:53.000Z" } ], "analyses": { "keywords": [ "cdm model", "weighing neutrinos", "hde model", "holographic dark energy", "total neutrino mass" ], "note": { "typesetting": "TeX", "pages": 6, "language": "en", "license": "arXiv", "status": "editable" } } }