RT Journal Article
T1 Quantum inflaton, primordial perturbations, and CMB fluctuations
A1 Cao García, Francisco Javier
A1 De Vega, H.J.
A1 Sánchez, N.G.
AB We compute the primordial scalar, vector and tensor metric perturbations arising from quantum field inflation. Quantum field inflation takes into account the nonperturbative quantum dynamics of the inflaton consistently coupled to the dynamics of the (classical) cosmological metric. For chaotic inflation, the quantum treatment avoids the unnatural requirements of an initial state with all the energy in the zero mode. For new inflation it allows a consistent treatment of the explosive particle production due to spinodal instabilities. Quantum field inflation (under conditions that are the quantum analog of slow-roll) leads, upon evolution, to the formation of a condensate starting a regime of effective classical inflation. We compute the primordial perturbations taking the dominant quantum effects into account. The results for the scalar, vector and tensor primordial perturbations are expressed in terms of the classical inflation results. For a N-component field in a O(N) symmetric model, adiabatic fluctuations dominate while isocurvature or entropy fluctuations are negligible. The results agree with the current Wilkinson Microwave Anisotropy Probe observations and predict corrections to the power spectrum in classical inflation. Such corrections are estimated to be of the order of m(2)/N-2, where m is the inflaton mass and H the Hubble constant at the moment of horizon crossing. An upper estimate turns to be about 4% for the cosmologically relevant scales. This quantum field treatment of inflation provides the foundations to the classical inflation and permits to compute quantum corrections to it.
PB American Physical Society
SN 2470-0010
YR 2004
FD 2004-10-22
LK https://hdl.handle.net/20.500.14352/104684
UL https://hdl.handle.net/20.500.14352/104684
LA eng
NO Cao, F. J., de Vega, H. J., & Sánchez, N. G. (2004). Quantum inflaton, primordial perturbations, and CMB fluctuations. Physical Review D, 70(8), 083528.
NO Ministerio de Educación, Ciencia y Deportes (España)
NO Universidad Complutense de Madrid
NO Ministerio de Ciencia y Tecnología (España)
NO Conseil Scientifique de l’Observatoire de Paris
DS Docta Complutense
RD 10 abr 2025