Cosmological constraints on sterile neutrino mass in gravity...Cosmological constraints on sterile...
Transcript of Cosmological constraints on sterile neutrino mass in gravity...Cosmological constraints on sterile...
Cosmological constraints on
sterile neutrino mass
in gravity
Hayato Motohashi
本橋 隼人 (RESCEU, The University of Tokyo)
1 2012.11.12-16 RESCEU symposium and JGRG22, Univ. of Tokyo
Alexei A. Starobinsky (Landau Inst.)
Jun’ichi Yokoyama (RESCEU)
in collaboration with
Two regimes of accelerated expansion
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Reheating
gravity
can describe the accelerated expansion.
Primordial inflation
Late-time acceleration
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Starobinsky, JETP Lett. 86, 157 (2007)
[arXiv:0706.2041]
Starobinsky, Phys.Lett. B91 (1980) 99
Appleby, Battye, Starobinsky, JCAP 1006, 005 (2010) [arXiv:0909.1737]
H.M., Nishizawa, PRD 86 (2012) 093514 [arXiv:1204.1472]
cf. model for both accelerated expansion
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Local scale
Solar system test
Horizon scale
Expansion history
Testing modified gravity
Intermediate scale
Large scale structure
Time variation of EoS parameter
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- 0.92 - 0.23
- 0.94 - 0.22
- 0.96 - 0.21
H.M., Starobinsky, Yokoyama
PTP 123 (2010) 887 [arXiv:1002.1141]
Komatsu et al.,
APJ Suppl. 192, 18 (2011)
[arXiv:1001.4538]
Growth index
Rapetti et al., arXiv: 1205.4679 6
H.M., Starobinsky, Yokoyama
PTP 123 (2010) 887 [arXiv:1002.1141]
Additional transfer function in gravity
gravity enhances matter power spectrum.
cancel
Massive neutrino suppresses matter power spectrum.
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Constraint on from BBN
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[331] Izotov, Thuan, Astrophys.J. 710, L67 (2010) [arXiv:1001.4440]
[332] Mangano,Serpico, Phys.Lett. B701, 296 (2011) [arXiv:1103.1261]
[333] Nollett, Holder [arXiv:1112.2683]
[122] Hamann et al, JCAP 1109, 034 (2011) [arXiv:1108.4136]
Abazajian et al [arXiv:1204.5379]
Constraints on and in ΛCDM
CMB
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(95% CL)
(68% CL)
LSS
ΛCDM + Komatsu et al.,
APJ Suppl. 192, 18 (2011)
[arXiv:1001.4538]
Reid et al,
Mon.Not.Roy.Astron.Soc. 404
(2010) 60 [arXiv:0907.1659]
Constraints on and in ΛCDM
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Riemer-Sorensen et al
[arXiv:1210.2131]
ΛCDM cosmology
sub-eV
sterile neutrino
Sterile neutrino mass 1 eV
ΛCDM model
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Mention et al.,
PRD 83, 073006 (2011)
[arXiv:1101.2755]
Giunti, Laveder,
Phys.Rev. C83 (2011) 065504
[arXiv:1006.3244]
Antonello et al,
[arXiv:1209.0122]
Neutrino oscillation
MCMC analysis: ΛCDM vs gravity
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H.M., Starobinsky and Yokoyama, arXiv:1203.6828
3 massless and 1 massive neutrino with mass = 1 eV
WMAP7, SDSS DR 7
Better fit : 10.7 (Δ AIC = 8.7)
GR : , :
ΛCDM
MCMC analysis: ΛCDM vs gravity
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H.M., Starobinsky and Yokoyama, arXiv:1203.6828
3 massless and 1 massive neutrino with mass = 1 eV
WMAP7, SDSS DR 7
Better fit : 10.7 (Δ AIC = 8.7)
GR : , :
ΛCDM
WMAP
ΛCDM
SDSS
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Summary
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Cosmology based on ΛCDM model
Sterile neutrino mass 1 eV
Neutrino oscillation experiments
Sterile neutrino mass 1 eV
gravity can resolve the tension.