Differences Between Second and First Inflation 2nd inflation: no known physical explanation. Why ? so small? Most natural value for a constant ? is ?Planck density?, which is 10120 times bigger than seen. 2nd inflation occurs at much lower energy density 2nd inflation started recently (only ~1 doubling so far; 1st had >100) 1st inflation was temporary ? the scalar field decayed into matter and inflation stopped Future of 2nd inflation is unknown because it?s so recent. Will dark energy decay or be forever constant? We don?t know.
limit of cosmic knowledge : Talk by Sandra M. Faber on 11-Dec'12