2014年年终总结 郭宗宽 2014.12.22.

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1 2014年年终总结 郭宗宽

2 1、2014年的工作情况及进展 组织学术会议 做学术报告
中国物理学会引力与相对论天体物理分会2014年学术年会 2014年7月6日―11日，河南郑州，200多学者参加 做学术报告 包括理论所lunch seminar， 理论所summer school专题讲座，国科大专题讲座等8个报告

3 发表学术论文 Reconstruction of the primordial power spectra with Planck and BICEP2 B. Hu, J.W. Hu, Z.K. Guo, R.G. Cai Phys. Rev. D90 (2014) Cited 22 times Cosmological parameter estimation from CMB and X-ray clusters after Planck J.W. Hu, R.G. Cai, Z.K. Guo, B. Hu J. Cosmol. Astropart. Phys. 05 (2014) 020 Cited 7 times Constraints on the LCDM model with redshift tomography RG. Cai, Z.K. Guo, B. Tang Phys. Rev. D89 (2014) Cited 2 times CMB anomalies from an inflationary model in string theory Z.G. Liu, Z.K. Guo, Y.S. Piao Eur. Phys. J. C 74 (2014) 3006 Cited 13 times

4 宇宙中微子的可观测效应

5 history of the relic neutrinos
particles: n,p, 𝑒 − , 𝑒 + ,𝜈,𝛾 ~1MeV ~0.3MeV ~0.1MeV ~1eV neutrino decoupling ee annihilation BBN CMB recombination LSS formation the weak reaction rate: Γ~ 𝑇 5 , 𝑇~ 𝑎 −1 𝜈 𝑒 +n↔p+ 𝑒 − , 𝑒 + +n↔p+ 𝜈 𝑒 ,n↔p+ 𝑒 − + 𝜈 𝑒 the expansion rate of the Universe: H~ 𝑇 2 𝐻 2 = 𝜋 𝐺 𝑁 𝜌 𝛾 + 𝜌 𝑒 + 𝜌 𝜈 + 𝜌 𝑏 neutrino decoupling: Γ~H

6  temperature: 𝑇 𝜈,0 = /3 𝑇 𝛾,0 =1.95 K∽1.7× 10 −4 eV  number density per flavor: 𝑛 𝜈,0 = 6𝜁(3) 4 𝜋 2 𝑇 𝜈,0 3 =112 cm −3  energy density: 𝜌 𝜈,0 = 7 𝜋 𝑇 𝜈,0 4 ⇒ Ω 𝜈,0 ℎ 2 =6× 10 − 𝑚 𝜈 ≪ 𝑇 𝜈,0 𝑚 𝜈 𝑛 𝜈,0 ⇒ Ω 𝜈,0 ℎ 2 = 𝑚 𝜈 eV 𝑚 𝜈 ≫ 𝑇 𝜈,0

7 neutrino oscillation 𝜈 𝑒 𝜈 𝜇 𝜈 𝜏 = 𝑈 𝑒1 𝑈 𝑒2 𝑈 𝑒3 𝑈 𝜇1 𝑈 𝜇2 𝑈 𝜇3 𝑈 𝜏1 𝑈 𝜏2 𝑈 𝜏 𝜈 1 𝜈 2 𝜈 3 parameters: 𝜃 12 , 𝜃 23 , 𝜃 13 , 𝛿 𝐶𝑃 ,∆ 𝑚 ,∆ 𝑚 2 32 ∆ 𝑚 ~7.54× 10 −5 eV 2 ∆ 𝑚 ~2.47× 10 −3 eV 2 ∑𝑚 𝜈 >0.06 eV⟺ Ω 𝜈,0 ≈0.1%

8 cosmological effects  CMB: the early ISW effect
Ω 𝜈,0 ℎ 2 = ∑𝑚 𝜈 eV Ω 𝜈,0 <1⟹ ∑𝑚 𝜈 <46 eV  CMB: the early ISW effect  LSS: free streaming, velocity dispersion 𝑘 fs ≃0.8 Ω Λ + Ω 𝑚 1+𝑧 𝑧 𝑚 𝜈 eV ℎ Mpc −1 𝑣 ≃81 1+𝑧 eV 𝑚 𝜈 km s −1

9 tensions between data 𝜎 8 Ω 𝑚 / : Planck galaxy cluster, discrepant at 3σ 𝜎 8 Ω 𝑚 / : CFHTLenS cosmic shear, discrepant at 2σ 1σ Planck Collaboration, “Planck 2013 results. XX. Cosmology from Sunyaev-Zeldovich cluster counts”, arXiv:

10 JW Hu, RG Cai, ZK Guo, B Hu, JCAP 05 (2014) 020.

11 2、将来研究工作的设想 原初引力波的理论研究 原初磁场的理论研究

12 谢谢!