Abstract: 
String theory suggests there are many universes, each
having different values of the fundamental parameters. Is it
possible to find evidence for such a multiverse? Introducing
certain assumptions, I make predictions for the up quark, down quark
and electron masses, as well as the scale of electroweak
interactions, in terms of the scale of the strong interactions.
These statistical correlations amongst fundamental parameters of the
Standard Model agree with observations to an accuracy that varies
from 20% to a factor of 3. Of course, these are postdictions; the
most interesting parameter of the Standard Model that has not been
measured is the Higgs boson mass. Assuming that the Standard Model
is valid to very high energies, simultaneous predictions for the top
quark and Higgs boson masses yield a Higgs mass of (105  125) GeV,
on the edge of present limits. Turning to fundamental cosmological
parameters, I argue that the multiverse allows an understanding of
several cosmological coincidences, leading to order of magnitude
predictions for the amount of dark matter, dark energy and the size
of primordial density perturbations, in terms of the electron mass,
the proton mass and the fine structure constant.
