TY - JOUR
T1 - Stabilizing the gravitational action and Coleman's solution to the cosmological constant problem
AU - Carlini, Alberto
AU - Martellini, Maurizio
PY - 1992/2/6
Y1 - 1992/2/6
N2 - We use the fifth-time action formalism introduced by Halpern and Greensite to stabilize the unbounded euclidean 4D gravity in two simple minisuperspace models. In particular, we show that, at the semiclassical level (h {combining short solidus overlay}→0), we still have as a leading saddle point the S4 solution and the Coleman peak at zero cosmological constant, for a fixed De Witt supermetric. At the quantum (one-loop) level the scalar gravitational modes give a positive semidefinite hessian contribution to the 5D partition function, thus removing the Polchinski phase ambiguity.
AB - We use the fifth-time action formalism introduced by Halpern and Greensite to stabilize the unbounded euclidean 4D gravity in two simple minisuperspace models. In particular, we show that, at the semiclassical level (h {combining short solidus overlay}→0), we still have as a leading saddle point the S4 solution and the Coleman peak at zero cosmological constant, for a fixed De Witt supermetric. At the quantum (one-loop) level the scalar gravitational modes give a positive semidefinite hessian contribution to the 5D partition function, thus removing the Polchinski phase ambiguity.
UR - http://www.scopus.com/inward/record.url?scp=13744265134&partnerID=8YFLogxK
U2 - 10.1016/0370-2693(92)90538-F
DO - 10.1016/0370-2693(92)90538-F
M3 - Article
SN - 0370-2693
VL - 276
SP - 36
EP - 40
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 1-2
ER -