- #1
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?
What does the TE CMB spectrum reveal?
In summary, according to Will Kinney, the TE polarization spectrum measured by the Planck and WMAP satellites shows evidence for superhorizon fluctuations at low multipoles, which is consistent with pre-bigbang inflation. This is further supported by the negative peak in the TE cross-correlation power spectrum near ##\ell=100##. The presence of superhorizon perturbations is a powerful test for inflation, as it is a unique prediction that cannot be produced by any purely causal theory in an expanding universe.
- #2
Hyperfine
- 156
- 156
According to Will Kinney, yes. Kinney is a professor of Physics at SUNY Buffalo.Rene Kail said:
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.
- #3
Hyperfine
- 156
- 156
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:
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.
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:
1. What is the TE CMB spectrum?
The TE CMB spectrum, also known as the polarization spectrum, is a graph that shows the distribution of temperature and polarization fluctuations in the cosmic microwave background (CMB) radiation. It is an important tool for understanding the early universe and the formation of large-scale structures.
2. How is the TE CMB spectrum measured?
The TE CMB spectrum is measured using telescopes and satellites that detect and map the CMB radiation. These instruments measure the temperature and polarization of the CMB at different points in the sky, which are then plotted on a graph to create the spectrum.
3. What information can we learn from the TE CMB spectrum?
The TE CMB spectrum provides valuable information about the composition, age, and evolution of the universe. It can also help us understand the initial conditions of the universe and the processes that led to the formation of galaxies and other structures.
4. What does the shape of the TE CMB spectrum reveal?
The shape of the TE CMB spectrum reveals the distribution of matter and energy in the early universe. It can also provide insights into the properties of dark matter and dark energy, which make up the majority of the universe's mass and energy.
5. How does the TE CMB spectrum support the Big Bang theory?
The TE CMB spectrum is one of the strongest pieces of evidence for the Big Bang theory. It shows that the universe was once in a hot and dense state, as predicted by the theory, and has been expanding and cooling ever since. The spectrum also matches the predictions of the cosmic inflation theory, which explains the rapid expansion of the universe in its early stages.
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