It has been speculated that the present-day acceleration of the universe is due to the existence of a false vacuum, which will eventually decay. Suppose that the energy density of the false vacuum is εΛ=0.69εc,0=3360MeVm−3, and that the current energy density of matter is εm,0=0.31εc,0=1510MeVm−3. What will be the value of the Hubble parameter once the false vacuum becomes strongly dominant? Suppose that the false vacuum is fated to decay instantaneously to radiation at a time tf=50t0. (Assume, for simplicity, that the radiation takes the form of blackbody photons.) To what temperature will the universe be reheated at t=tf? What will the energy density of matter be at t=tf? At what time will the universe again be dominated by matter?