Evolving Dark Energy with w =/ -1
Hall, Lawrence J.
Nomura, Yasunori
Oliver, Steven J.
Lawrence Berkeley National Laboratory. Physics Division.
Lawrence Berkeley National Laboratory
2005-03-31
English
Theories of evolving quintessence are constructed that generically lead to deviations from the w = -1 prediction of non-evolving dark energy. The small mass scale that governs evolution, m_\phi \approx 10^-33 eV, is radiatively stable, and the"Why Now?'' problem is solved. These results rest crucially on seesaw cosmology: in broad outline, fundamental physics and cosmology can be understood from only two mass scales, the weak scale, v, and the Planck scale, M. Requiring a scale of dark energy \rho_DE^1/4 governed by v^2/M, and a radiatively stable evolution rate m_\phi given by v^4/M^3, leads to a distinctive form for the equation of state w(z) that follows from a cosine quintessence potential. An explicit hidden axion model is constructed. Dark energy resides in the potential of the axion field which is generated by a new QCD-like force that gets strong at the scale \Lambda \approx v^2/M \approx \rho_DE^1/4. The evolution rate is given by a second seesaw that leads to the axion mass, m_\phi \approx \Lambda^2/f, with f \approx M.
Radiative Correction, Stability
Numerical Calculations
Forecasting
Potential, Axion
Cosmology
Quintessence
Dark Energy
72
Seesaw Model
Physics Dark Energy
Symmetry Breaking
Axions
Journal Name: Physical Review D; Journal Volume: 95; Journal Issue: 14; Related Information: Journal Publication Date: 29 September 2005
Article
Text
rep-no: LBNL-57425
grantno: DE-AC02-05CH11231
doi: 10.1103/PhysRevLett.95.141302
osti: 964010
https://digital.library.unt.edu/ark:/67531/metadc928064/
ark: ark:/67531/metadc928064