Recitation9 - 1 PHY100 Recitation#9 Week of Dec 1 2008 1 According to Big Bang cosmology nucleosynthesis occured ~100 seconds after the Big Bang

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1 PHY100 ― Recitation #9 ― Week of Dec. 1, 2008 1) According to Big Bang cosmology, “nucleosynthesis” occured ~100 seconds after the Big Bang. What is meant by nucleosynthesis? Nucleosynthesis is the process of creating new atomic nuclei from preexisting nucleons (protons and neutrons). It is believed that the primordial nucleons themselves were formed from the quark-gluon plasma from the theoretical Big Bang as it cooled below ten million degrees. Why didn't nucleosynthesis occur earlier. .. say at a time like 1 microsecond after the Big Bang? The amount of helium that is produced in this early burst of nucleosynthesis--that starts when the universe is a second old and ends when the universe is about three minutes old--is the vast majority of all the helium in our universe. Stars produce helium today, but this early burst of nucleosynthesis generated more helium than all the stars that have ever lived anywhere in our universe. Similarly, this early interaction produced more energy than has been generated by all the stars in the universe today. This is an enormously energetic event. It is the smoking gun of Big Bang Theory. Without this theory, there's no other way to account for the helium that we see today in our universe. 2) What is the Cosmic Microwave Background (CMB)? is a form of electromagnetic radiation filling the universe.[1] With a traditional optical telescope, the space between stars and galaxies (the background) is pitch black. But with a radio telescope, there is a faint background glow, almost exactly the same in all directions, not associated with any star, galaxy, or other object. This glow is strongest in the microwave region of the radio spectrum, hence the name cosmic microwave
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/30/2009 for the course MISCELLANE 123 taught by Professor Torres during the Spring '09 term at Rochester.

Page1 / 3

Recitation9 - 1 PHY100 Recitation#9 Week of Dec 1 2008 1 According to Big Bang cosmology nucleosynthesis occured ~100 seconds after the Big Bang

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online