AS101 Lecture Notes - Lecture 7: Large Hadron Collider, Baryon, Hadronization
Document Summary
As101 lecture 7: the cosmological principle - assumption that any observer in the universe sees the same thing (homogeneity + isotropy) Neutron -> antineutron (antibaryon number: normal matter is called baryonic matter, an antibaryon is the opposite. Matter is made up of quarks and leptons. Quark - a fundamental particle, combine to form hadrons, protons and neutrons are the most stable ones. For every 1 billion annihilations, 1 normal matter particle survives - this is how matter exists, known as the matter-antimatter asymmetry problem o large hadron collider (lhc): Used to recreate conditions just after the big bang. Black body temperature = approximately 1 trillion k. Proton and neutron creations topped because no longer sufficient energy. Still enough energy to do matter-antimatter collisions. All protons, neutrons, and electrons were made in the first 4 seconds. Protons and neutrons link to form deuterium, universe cooled enough not to break them up (not enough energy) t = 3 minutes.
