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micomaco86572
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Which textbook does contain some accessible details of the calculation of the temperature of CMB?
Thx!
Thx!
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Wallace said:Thinking about it, the pressure as well as the temperature should determine at what point neutral hydrogen can form, and the baryon/photon ratio will determine in part the pressure (which is why it changes the sounds speed and hence the accoustic peaks). As I say though, I'm thinking out loud here.
twofish-quant said:Cool. Can you point me to a page on the web where someone has worked this out?
The Cosmic Microwave Background (CMB) is the remnant radiation from the Big Bang, which is the event that is believed to have created the universe. It is important to study because it provides valuable information about the early stages of the universe and can help us understand the structure and evolution of the universe.
The temperature of the CMB is calculated using the Planck's Law, which relates the temperature of an object to the amount of radiation it emits. Scientists use specialized instruments, such as the Planck satellite, to measure the intensity of the CMB radiation and then use the Planck's Law to calculate its temperature.
The current accepted value for the temperature of the CMB is approximately 2.7 Kelvin (or -270.45 degrees Celsius). This value has been confirmed by various experiments and is considered to be one of the most precise measurements in modern cosmology.
The temperature of the CMB is very uniform across the sky, with only small variations of about one part in 100,000. These tiny variations, known as anisotropies, provide valuable insights into the structure and composition of the early universe.
The temperature of the CMB has been decreasing over time due to the expansion of the universe. This phenomenon is known as the cosmological redshift and is a key piece of evidence for the Big Bang theory. The CMB is expected to continue cooling as the universe expands further.