Differences between polarisations and temperature anisotropies in the

  • Thread starter Thread starter pleasehelpmeno
  • Start date Start date
  • Tags Tags
    Temperature
AI Thread Summary
E-mode and B-mode polarizations are two distinct types of polarization patterns in the cosmic microwave background (CMB). E-modes arise from scalar and tensor perturbations, while B-modes are specifically generated by tensor perturbations, such as gravitational waves. Temperature anisotropies refer to variations in the temperature of the CMB, which are caused by density fluctuations in the early universe. Understanding the differences between these polarizations and temperature anisotropies is crucial for cosmological studies. For further reading, resources like the provided Berkeley link can offer more detailed insights into these concepts.
pleasehelpmeno
Messages
154
Reaction score
0
Basically as the questions says, can anyone explain what E and B mode polarisations are and homework they differ from temp anisotropies.

I know that E mode are from scalar and tensor perturbations B mode from tensor perturbations (Gwaves). I don't really understand what they are or how they differ from the change in temp.

Any recommended literature would be helpful
 
Space news on Phys.org
See http://cosmology.berkeley.edu/~yuki/CMBpol/CMBpol.htm
 

Thread 'Matter density right after the decoupling'

https://en.wikipedia.org/wiki/Recombination_(cosmology) Was a matter density right after the decoupling low enough to consider the vacuum as the actual vacuum, and not the medium through which the light propagates with the speed lower than ##({\epsilon_0\mu_0})^{-1/2}##? I'm asking this in context of the calculation of the observable universe radius, where the time integral of the inverse of the scale factor is multiplied by the constant speed of light ##c##.
View full post »

Thread 'Hubble Constant, Dark Energy and the Expanding Universe'

Why was the Hubble constant assumed to be decreasing and slowing down (decelerating) the expansion rate of the Universe, while at the same time Dark Energy is presumably accelerating the expansion? And to thicken the plot. recent news from NASA indicates that the Hubble constant is now increasing. Can you clarify this enigma? Also., if the Hubble constant eventually decreases, why is there a lower limit to its value?
View full post »

Similar threads

A Decoupling of SVT Metric Perturbations
Replies
2
Views
2K
Constraints on Inflation (Planck 2015 results XX)
Replies
8
Views
3K
Why does inflation generate gravity waves?
Replies
5
Views
2K
I Resulting temperature of mixed liquids
Replies
5
Views
1K
A Does x affect the value of [a^2,(a^†)^2×e^2ikx]
Replies
2
Views
1K
Exploring Primordial Universe w/ QUBIC: 400 Horns at 100 mK in Antarctica
Replies
2
Views
2K
How Does Temperature Affect Sound Wave Velocity in Air?
Replies
2
Views
3K
I Questions about bayronic acoustic oscillations
Replies
9
Views
3K
I On 'A Quarter Waveplate (QWP) rotated between 2 Polarisers'
Replies
5
Views
3K
A couple of inflationary problems
Replies
2
Views
1K

Hot Threads

Recent Insights

Back
Top