Scientific article

Early dark energy from zero-point quantum fluctuations

Published inPhysics letters. B, vol. 704, no. 3, p. 102-107
Publication date2011

We examine a cosmological model with a dark energy density of the form ρDE(t)=ρX(t)+ρZ(t)ρDE(t)=ρX(t)+ρZ(t), where ρXρX is the component that accelerates the Hubble expansion at late times and ρZ(t)ρZ(t) is an extra contribution proportional to H2(t)H2(t). This form of ρZ(t)ρZ(t) follows from the recent proposal that the contribution of zero-point fluctuations of quantum fields to the total energy density should be computed by subtracting the Minkowski-space result from that computed in the FRW space–time. We discuss theoretical arguments that support this subtraction. By definition, this eliminates the quartic divergence in the vacuum energy density responsible for the cosmological constant problem. We show that the remaining quadratic divergence can be reabsorbed into a redefinition of Newtonʼs constant only under the assumption that ∇μ〈0|Tμν|0〉=0∇μ〈0|Tμν|0〉=0, i.e. that the energy–momentum tensor of vacuum fluctuations is conserved in isolation. However in the presence of an ultra-light scalar field X with mX

  • Early dark energy
  • Cosmological constant
  • Vacuum fluctuations
Citation (ISO format)
MAGGIORE, Michele et al. Early dark energy from zero-point quantum fluctuations. In: Physics letters. B, 2011, vol. 704, n° 3, p. 102–107. doi: 10.1016/j.physletb.2011.09.010
Main files (1)
Article (Published version)
ISSN of the journal0370-2693

Technical informations

Creation04/14/2014 2:13:00 PM
First validation04/14/2014 2:13:00 PM
Update time03/14/2023 9:07:40 PM
Status update03/14/2023 9:07:39 PM
Last indexation01/16/2024 9:42:21 AM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack