STRINGS!!

Question 1

Define the Nambu-Goto action

Answer 1

Proper length world line, check notes for form

Question 2

Give a pro and con of the Nambu-Goto action

Answer 2

The action is invariant under reparameterisation τ → f(τ)

The limit m to 0 is ill-defined and sqrt is messy

Question 3

Define the Polyakov action

Answer 3

Nambu-goto with 1/e factor and -em^2 and 1/2 in front

Check notes for form