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Neutrinos and Cosmology
Alessandro Melchiorri Universita’ di Roma, “La Sapienza”
NOW 2010, Conca-Specchiulla September 7th 2010
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Komatsu et al, 2010, 1001.4538
New WMAP results from 7 years of observations
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Komatsu et al, 2010, 1001.4538
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New Measurements, More Parameters !
• Neutrino masses
• Neutrino effective number
• Primordial Helium
m
effN
PY
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Small scale CMB can probe Helium abundance at recombination.
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Komatsu et al, 2010, 1001.4538
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Komatsu et al, 2010, 1001.4538
Neutrino background.Changes early ISW.Hint for N>3 ?
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Gianpiero Mangano, Alessandro Melchiorri, Olga Mena, Gennaro Miele, Anze SlosarJournal-ref: JCAP0703:006,2007
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Current constraints on neutrino mass from Cosmology (Fogli et al, 2010 in preparation).
Blue: WMAP-7Red: w7+SN+Bao+H0Green: w7+CMBsuborb+SN+LRG+H0
(Plot made by Luca Pagano)
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Blue: WMAP-7Red: w7+SN+Bao+H0Green: w7+CMBsuborb+SN+LRG+H0
Current constraints on neutrino mass from Cosmology (Fogli et al, 2010 in preparation).
(Plot made by Luca Pagano)
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Sudden Reionization
As we don’t know precisely the details of the reionization history we should consider more general reionization scenarios
CAMB Notes, Antony Lewis
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MH’s Reionization Following Mortonson & Hu we can parametrize the
reionization history as a free function of the redshift by decomposing the free electron fraction as
• The principal components Sm (z) are the eigenfunctions of the Fisher matrix of an ideal, cosmic variance limited, experiment.
• mm are the amplitudes of the Sm (z)
• xfid (z) is the WMAP fiducial model at which the FM is computed M. J. Mortonson and W. Hu ApJ 686, L53 (2008)
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Impact of generalized reionization on CMB constraints on Neutrino Mass
Archidiacono, Cooray, Melchiorri, Pandolfi, 2010, PRD
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PlanckSatellite launch14/5/2009
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Blue: current dataRed: Planck
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Galli, Martinelli, Melchiorri, Pagano, Sherwin, Spergel, PRD submitted, arXiv:1005.3808 2010
Let’s consider not only Planck but alsoACTpol (From Atacama Cosmology Telescope,Ground based, results expected by 2013)CMBpol (Next CMB satellite, 2020 ?)
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Galli, Martinelli, Melchiorri, Pagano, Sherwin, Spergel, PRD submitted, arXiv:1005.3808 2010
Blue: PlanckRed: Planck+ACTpolGreen: CMBPol
Constraints on Neutrino Mass
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Galli, Martinelli, Melchiorri, Pagano, Sherwin, Spergel, PRD submitted, arXiv:1005.3808 2010
Blue: PlanckRed: Planck+ACTpolGreen: CMBPol
Constraints on Neutrino Number
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Galli, Martinelli, Melchiorri, Pagano, Sherwin, Spergel, PRD submitted, arXiv:1005.3808 2010
Blue: PlanckRed: Planck+ACTpolGreen: CMBPol
Constraints on Helium Abundance
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• Recent CMB measurements fully confirm L-CDM. Improved constraints on inflation • With future measurements constraints on new parameters related to laboratoryPhysics could be achieved.
In 2012 from Planck we will know:
- If the total neutrino mass is less than 0.5eV.- If there is an extra background of relativistic particles.- Helium abundance with 0.01 accuracy.
CONCLUSIONS
We Want NOW 2012 !
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