The question has following implications
1) What does the term anisotropy mean ?
2) Because universe is homogeneous and isotropic in general
how does one expect anisotropies ?
3) Is it a purely quantum effect ? or is it possible to have
classical explanations of this phenomenon ?
4) Is there a definite pattern in the anisotropy ? If so
how to explain that pattern ?
5) What are theoretical implications for inflationary theories ?
6) Does anisotropies give any indications on the nature
of dark matter. For example is DM cold or warm ?
I am adding a figure; source is
http://astro.berkeley.edu/~mwhite/rosetta/node2.html
Sashank, Thank you for your detailed answer.
Let us continue this discussion. Because CMB ananysis does not
help us to understand whether DM is cold, do you think warm
dark matter will also pass the test of CMB analysis ?
would you please explain the calculation
2000,000*1100 * (10^9/13.8)
From where do we get factors of 13.8 and 10^9.
About the second peak, let me ask you another point.
Now we know that almost 26 % of all matter is
dark matter. Is it derived from the ratio of heights of
first peak to the second peak ?
Thank you Sashank for your elaborate and thoughtful response.
Let us carry forward this discussion further.
I have seen a picture of acoustic oscillations at the last scattering
surface at wanehu page at
http://background.uchicago.edu/~whu/physics/projection.html
I am attaching this picture.
In the picture we see that there is a rarefied region and a
dense region side by side. The rare region is red whereas the
dense region is red. In the dense region photon is interacting
more with matter (high temp) whereas in the blue region
there is less matter therefore less interaction with photons
and (temp low).
You have explained to me the role of baryonic matter and
dark matter for the formation of high density regions and
potential wells. Could you please explain the role of
dark energy, that you have mentioned in your comment.
Here is the picture of acoustic oscillations. The source is at
http://background.uchicago.edu/~whu/physics/projection.html
Please don't forget that there is a large (order 10^-3) dipole term in the CMB, generally interpreted as a simple red/blue shirt indicative of our velocity with respect to the CMB rest frame (a thoroughly classical explanation). (This was the only CMB anisotropy known for over two decades, roughly 1970 - 1992.)
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