Lecture 10

Question 1

Unified theories

Answer 1

the forces (electromagnetism, the weak, the strong and gravity) will unify if the energy is increased enough

Question 2

Quantum chromodynamics

Answer 2

another description of strong nuclear interactions

Question 3

Theory of everything

Answer 3

a theory of quantum gravity

Question 4

elementary particles

Answer 4

something effectively point-like

Question 5

spin formula

Answer 5

g(eff) = n(spin) x n(anti) x n(pauli)

if it is anti, = 2 if not = 1

Question 6

quantum of solace

Answer 6

S = √s(s+1)ℏ
Sz = msℏ

Question 7

Hot dark matter

Answer 7

does not match observations of clustering galaxies

non-baryonic dark matter is cold and does not consist of neutrinos

neutrinos are not highly relativistic

Question 8

Sakharov Conditions for Baryogengesis

Answer 8

1. Baryon number violation: requires the proton to decay
2. CP violation: requires charge and parity to switch during an interaction
3. Departure from thermal equilibrium: permits reaction to proceed preferentially in one direction