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The Odd-Parity CMB Bispectrum · Around

2010

The Odd-Parity CMB Bispectrum

Kamionkowski, Marc, Souradeep, Tarun

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Measurement of the cosmic microwave background (CMB) bispectrum, or three-point correlation function, has now become one of the principle efforts in early-Universe cosmology.

Here we show that there is a odd-parity component of the CMB bispectrum that has been hitherto unexplored.
We argue that odd-parity temperature-polarization bispectra can arise, in principle, through weak lensing of the CMB by chiral gravitational waves or through cosmological birefringence, although the signals will be small even in the best-case scenarios.
Measurement of these bispectra requires only modest modifications to the usual data-analysis algorithms.

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M. Kamionkowski, T. L. Smith and A. Heavens, arXiv:1010.0251 [astro-ph.CO]

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