•Lots
of theory here!
•
•Jeans (1902), gravitational collapse in a stationary
medium, depends
on sound speed and density
•
•Lifshitz (1946), general case including expanding
medium, but collapse is not
typically exponetial and structures grow very slowly – too slowly! Cannot start with
infinitesimal perturbations.
•
•Zeldovich, Novikov, Peebles (1960s) used finite perturbations (1 part in 10000).
•
•Main test of all this is the cosmic microwave
background radiation,
since fluctations should leave imprints.
•