AI Article Synopsis
- The text discusses how rotating the linear polarization of the cosmic microwave background (CMB) can create B-mode polarization as it travels through space.
- It explains that by measuring various polarization correlations (like TE, EE, EB, and TB), researchers can determine the rotation angle of the polarization across different areas of the sky.
- This method allows scientists to differentiate between primordial B modes (original elements from the universe's early moments) and those created by this rotation, and also to separate rotation effects from cosmic shear influences.
Article Abstract
If the linear polarization of the cosmic microwave background is rotated in a frequency-independent manner as it propagates from the surface of last scatter, it may introduce a B-mode polarization. Here I show that measurement of higher-order TE, EE, EB, and TB correlations induced by this rotation can be used to reconstruct the rotation angle as a function of position on the sky. This technique can be used to distinguish primordial B modes from those induced by rotation. The effects of rotation can be distinguished geometrically from similar effects due to cosmic shear.
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| http://dx.doi.org/10.1103/PhysRevLett.102.111302 | DOI Listing |
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