TY - JOUR
T1 - Initial conditions for inflation
AU - Kaloper, Nemanja
AU - Kleban, Matthew
AU - Lawrence, Albion
AU - Shenker, Stephen
AU - Susskind, Leonard
PY - 2002/11/11
Y1 - 2002/11/11
N2 - Free scalar fields in de Sitter space have a one-parameter family of states invariant under the de Sitter group, including the standard thermal vacuum. We show that, except for the thermal vacuum, these states are unphysical when gravitational interactions are included. We apply these observations to the quantum state of the inflaton, and find that at best, dramatic fine tuning is required for states other than the thermal vacuum to lead to observable features in the CMBR anisotropy.
AB - Free scalar fields in de Sitter space have a one-parameter family of states invariant under the de Sitter group, including the standard thermal vacuum. We show that, except for the thermal vacuum, these states are unphysical when gravitational interactions are included. We apply these observations to the quantum state of the inflaton, and find that at best, dramatic fine tuning is required for states other than the thermal vacuum to lead to observable features in the CMBR anisotropy.
KW - Cosmology of Theories beyond the SM
KW - Physics of the Early Universe
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U2 - 10.1088/1126-6708/2002/11/037
DO - 10.1088/1126-6708/2002/11/037
M3 - Article
AN - SCOPUS:23044450123
SN - 1029-8479
VL - 6
SP - 747
EP - 773
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 11
ER -