出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The idea of a variable dark energy has been entertained many times in the
literature and from many di
erent points of view. Quintessence is just a popular way to
implement this idea in recent times, but so far with little success. Another possibility
is to think of the cosmological term, , as a \running quantity" much in the same way
as the electromagnetic coupling constant. However, the fact that is a dimension-four
parameter implies that it may obey a peculiar renormalization group equation, which
at low energies could be dominated by \soft decoupling" contributions of the form
H2M2P stemming from physics near the Planck scale. This value lies in the ballpark of
the measurements from CMB and high-z supernovae. A \renormalized" FLRWcosmology
of this kind may reveal itself as a sound, and testable, proposal for a variable model
within quantum eld theory in curved space time.
