Primordial power spectrum versus extension parameters beyond the standard model

• Published in: Physical Review D
• Main Authors: Guo, ZK, Zhang, YZ, Guo, ZK (reprint author), Chinese Acad Sci, State Key Lab Theoret Phys, Inst Theoret Phys, POB 2735, Beijing 100190, Peoples R China.
• Format: Report
• Language: English
• Published: 2012
• Subjects: Observations Cosmological Interpretation; Wmap Data; Anisotropy; Telescope; Reconstruction; Oscillations; Inflation; Universe; Physics; telescopes; vibrating bodies; cosmology; 各向异性; anisotropic crystals; anisotropie; anisotropie (deutsch); anisotropie (francais); directional properties; nonisotropy; onisotropy; photothermotropism; thermotropism; aeolotropy; 望远镜; astronomical telescopes; optical telescopes; infrared telescopes; 重构; vibrations; mechanical vibrations; tuning forks; schwingungen; vibration; vibrations (francais); fluid oscillations; flow oscillations; liquid oscillations; oscillating flow; mechanical oscillations; phugoid oscillations; plasma oscillations; 充气吹胀; 天体演化学; cosmogony; cosmography; cosmic strings; strings; dirac cosmology; early universe; solar nebula; steady state theory; cosmos; brane world; brane universe; randall-sundrum model; accelerating universe; anthropic principle; big-bang theory; brans-dicke cosmology; expanding universe; hubble model; inflation (cosmological); large scale structure (cosmological); mach principle; olbers\' paradox; population iii stars; steady-state theory; higher dimensional cosmology; multiverse; planetesimals; solar origin; primordial stars; metagalaxy; nebula; solar; 宇宙学; 早期宇宙; Hubble; Randall; South Pole; Wilkinson; South pole
• Online Access: http://ir.itp.ac.cn/handle/311006/15100; https://doi.org/10.1103/PhysRevD.85.103519

We reconstruct the shape of the primordial power spectrum of curvature perturbations in extended cosmological models, including addition of massive neutrinos, extra relativistic species, or varying primordial helium abundance, from the latest cosmic microwave background data from the Wilkinson Microwave Anisotropy Probe, the Atacama Cosmology Telescope, and the South Pole Telescope. We find that a scale-invariant primordial spectrum is disfavored by the data at 95% confidence level even in the presence of massive neutrinos, however it can lie within the 95% confidence region if the effective number of relativistic species or the primordial helium abundance is allowed to vary freely. The constraints on the extension parameters from WMAP7 + ACT + H-0 + BAO are the total mass of neutrinos Sigma m(p) < 0.48 eV (95% C.L.), the effective number of relativistic species N-eff 4.50 +/- 0.81, and the primordial helium abundance Y-p 0.303 +/- 0.075. The constraints from WMAP7 + SPT + H-0 + BAO are Sigma m(p) < 0.45 eV (95% C.L.), N-eff 3.86 +/- 0.63, and Y-p 0.277 +/- 0.050.