Spatial variation of the fine-structure parameter and the cosmic microwave background

Spatial variation of the fine-structure parameter and the cosmic microwave background

We study the effects on cosmic microwave background ~CMB! temperature and polarization anisotropies of spatial fluctuations of the fine-structure parameter between causally disconnected regions of the Universe at the time of recombination. Analogous to weak gravitational lensing, in addition to modifying the mean power spectra and inducing a curl component (B mode! to the polarization, spatial ...

Quintessence and variation of the fine structure constant in the cosmic microwave background radiation

the underlying structure of language proficiency and the proficiency level

هدف از انجام این تخقیق بررسی رابطه احتمالی بین سطح مهارت زبان خارجی (foreign language proficiency) و ساختار مهارت زبان خارجی بود. تعداد 314 زبان آموز مونث و مذکر که عمدتا دانشجویان رشته های زبان انگلیسی در سطوح کارشناسی و کارشناسی ارشد بودند در این تحقیق شرکت کردند. از لحاظ سطح مهارت زبان خارجی شرکت کنندگان بسیار با هم متفاوت بودند، (75 نفر سطح پیشرفته، 113 نفر سطح متوسط، 126 سطح مقدماتی). کلا ...

The cosmic microwave background

Fig. 2:The power spectrum of CMB anisotropies as seen by BOOMEranG.The first peak corresponds to an angular scale of about 1degree as predicted for it "flat Universe" (i.e., a Universe where the spatial part of the metric is Euclidean). ';2 4000 .3 Fig. 1: Map of the Cosmic Microwave Background obtained by the BOOMERanG experiment.The one-degree-Iike bumps ofthe CMS emission are tiny local fluc...

The Cosmic Microwave Background

I review the discovery of the temperature fluctuations in the cosmic microwave background radiation. The underlying theory and the implications for cosmology are reviewed, and I describe the prospects for future progress.