A What does the TE CMB spectrum reveal?

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The TE polarization spectrum measured by the Planck and WMAP satellites indicates potential evidence for superhorizon fluctuations at low multipoles, which may support the theory of pre-big bang inflation. Will Kinney, a physics professor, highlights an anti-correlation in the TE cross-correlation power spectrum that aligns with these superhorizon modes. He presents this data in his book, although it lacks specific literature references. The negative peak near multipole moment ##\ell=100## is particularly significant, as it suggests the presence of superhorizon perturbations, a key prediction of inflationary theory. This finding reinforces the notion that superhorizon perturbations cannot arise from purely causal theories in an expanding universe.
Rene Kail
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Does the polarization spectrum TE measured by the Planck and WMAP satellites show evidence for superhorizon fluctuations at low multipoles and are these evidence for pre-bigbang inflation?
 
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Rene Kail said:
Does the polarization spectrum TE measured by the Planck and WMAP satellites show evidence for superhorizon fluctuations at low multipoles and are these evidence for pre-bigbang inflation?
According to Will Kinney, yes. Kinney is a professor of Physics at SUNY Buffalo.

In chapter 6 of his recent book (see below) he presents a figure of the TE cross-correlation power spectrum showing an anti-correlation at low multipole moments assigned as superhorizon modes. Unfortunately, no reference to the literature is given.

The actual power spectrum is from the Planck collaboration. I checked that, although I fail to recall from which of their many papers.

Will Kinney, An Infinity of Worlds: Cosmic Inflation and the Beginning of the Universe, The MIT Press, 2022.
 
To elaborate the comments made in Post #2. The TE cross-correlation power spectrum (courtesy of NASA/LAMBDA Archive Team) from the Planck mission is illustrated below:
te_spectrum_2020aug_1024.png


It is the negative going peak in the power spectrum near ##\ell=100## that Kinney attributes to evidence consistent with superhorizon modes and thus with inflation.

Kinney said:
By far the most powerful general test of inflation is the presence of superhorizon perturbations. This is a prediction that is, at least in the case of an expanding universe, unique to inflation ... , and does not depend on any particular model for inflation. No purely causal theory in an expanding universe can produce superhorizon perturbations.
 
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