scholarly journals Large-Angle Cosmic Microwave Background Anisotropy in an Open Universe in the One-Bubble Inflationary Scenario

1995 ◽  
Vol 455 ◽  
pp. 412 ◽  
Author(s):  
Kazuhiro Yamamoto ◽  
Misao Sasaki ◽  
Takahiro Tanaka
Keyword(s):  
Cosmic Microwave Background ◽  
Large Angle ◽  
Microwave Background ◽  
Inflationary Scenario ◽  
Open Universe ◽  
Cosmic Microwave Background Anisotropy ◽  
The One

SAMPLE VARIANCE IN LARGE-SCALE COSMIC MICROWAVE BACKGROUND ANISOTROPY MEASUREMENTS

1998 ◽  
Vol 07 (01) ◽  
pp. 89-96 ◽  
Author(s):  
KIN-WANG NG
Keyword(s):  
Correlation Function ◽  
Cosmic Microwave Background ◽  
Large Scale ◽  
Large Angle ◽  
Density Fluctuations ◽  
Sample Variance ◽  
Small Scale ◽  
Microwave Background ◽  
Cosmic Microwave Background Anisotropy ◽  
Computationally Intensive

The effects of limited sky coverage in large-angle cosmic microwave background anisotropy experiments are investigated by computing the variance of the angular two-point correlation function with an incomplete sphere. We find that, assuming a power spectrum of density fluctuations with spectral index n = 1, the Galactic cut of half-width 20° (40°) about the Equator made by the COBE DMR experiment would induce a sample variance on the rms temperature fluctuation [(ΔT/T) rms ]2 (or equivalently, the correlation function at zero lag), which is 12% (38%) greater than the cosmic variance with a whole sky coverage. This result is about two times smaller than the naive expectation that the cosmic variance is enhanced by a factor of [Formula: see text], where A is the solid angle sampled by the experiment. We also find that the sample variance of the correlation function at nonzero lag can approach the cosmic variance limit. Our approach provides an analytic way of finding a theoretical error to the theoretical prediction for a particular experiment (either large- or small-scale), without having recourse to computationally intensive Monte Carlo or maximum likelihood methods.

scholarly journals One Bubble Inflation

1999 ◽  
Vol 183 ◽  
pp. 303-308
Author(s):  
Takahiro Tanaka
Keyword(s):  
Cosmic Microwave Background ◽  
Temperature Fluctuation ◽  
Background Radiation ◽  
Cosmic Microwave Background Radiation ◽  
Microwave Background ◽  
Open Universe ◽  
Microwave Background Radiation ◽  
The Creation ◽  
The One ◽  
Inflation Scenario

Evaluating the temperature fluctuation in the cosmic microwave background radiation, the viability of the one bubble inflation scenario is studied. It is shown that it is possible to construct a model which explains the creation of an open universe.

scholarly journals Cosmic Microwave Background Anisotropy at Degree Angular Scales and the Thermal History of the Universe

1997 ◽  
Vol 480 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Paolo de Bernardis ◽  
Amedeo Balbi ◽  
Giancarlo De Gasperis ◽  
Alessandro Melchiorri ◽  
Nicola Vittorio
Keyword(s):  
Cosmic Microwave Background ◽  
Thermal History ◽  
Microwave Background ◽  
Cosmic Microwave Background Anisotropy ◽  
History Of ◽  
The Universe
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