Cosmic microwave background theory

被引:5
作者
Bond, JR [1 ]
机构
[1] Canadian Inst Theoret Astrophys, Canadian Inst Adv Res, Cosmol Program, Toronto, ON M5S 3H8, Canada
关键词
D O I
10.1073/pnas.95.1.35
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
A long-standing goal of theorists has been to constrain cosmological parameters that define the structure formation theory from cosmic microwave background (CMB) anisotropy experiments and large-scale structure (LSS) observations, The status and future promise of this enterprise is described. Current band-powers in l-space are consistent with a Delta T flat in frequency and broadly follow inflation-based expectations. That the levels are similar to(10(-5))(2) provides strong support for the gravitational instability theory, while the Far Infrared Absolute Spectrophotometer (FIRAS) constraints on energy injection rule out cosmic explosions as a dominant source of LSS. Band-powers at l greater than or similar to 100 suggest that the universe could not have re-ionized too early. To get the LSS of Cosmic Background Explorer (COBE)-normalized fluctuations right provides encouraging support that the initial fluctuation spectrum was not far off the scale invariant form that inflation models prefer: e.g., for tilted Lambda cold dark matter sequences of fixed 13-Gyr age (with the Hubble constant H(0) marginalized), n(s) = 1.17 +/- 0.3 for Differential Microwave Radiometer (DMR) only; 1.15 +/- 0.08 for DMR plus the SK95 experiment; 1.00 +/- 0.04 for DMR plus all smaller angle experiments; 1.00 +/- 0.05 when LSS constraints are included as well. The CMB alone currently gives weak constraints on n and moderate constraints on Omega(tot), but theoretical forecasts of future long duration balloon and satellite experiments are shown which predict percent-level accuracy among a large fraction of the 10+ parameters characterizing the cosmic structure formation theory, at least if it is an inflation variant.
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收藏
页码:35 / 41
页数:7
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