Author Topic: Acoustic Waves in CMB  (Read 1316 times)

Offline n8hanson

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Acoustic Waves in CMB
« on: October 03, 2014, 09:12:38 AM »
I listed to the podcast on this subject twice, but I didn't pick up the root cause of the acoustic waves.

1. Were the waves caused by the Big Bang?
2. Were the waves caused by quantum fluctuations? If so, were they in flux before the Big Bang (can we even know this?), or were they in flux during the initial expansion until they "froze"?

Thanks,
Nate

Offline CthulhuKid

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Re: Acoustic Waves in CMB
« Reply #1 on: October 06, 2014, 12:24:30 PM »
I'm not sure about the acoustic waves, but the gravitational waves made by the Big Bang were the subject of the cover article of October's Scientific American:

http://www.scientificamerican.com/article/how-big-bang-gravitational-waves-could-revolutionize-physics/

Might shed some light on your questions.

Offline n8hanson

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Re: Acoustic Waves in CMB
« Reply #2 on: October 07, 2014, 01:17:25 PM »
Thanks, CthulhuKid,

I've read a bunch on the polarized patterns in the CMB and what that *might* mean. However, the acoustic topic was a little different. Here is a website that explains a bit about it:

http://www.astro.virginia.edu/~dmw8f/BBA_web/bba_home.html

But even here, I'm having trouble finding what the original source of the waves was. I can't tell if it is some kind of left over pressure waves from the Big Bang explosion (was it even an "explosion"?), or if it is tied directly to the temp. differences in the CMB (which I thought were the result of tiny particles popping in and out of existence).

Nate