Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-02-10
Phys.Rev. D62 (2000) 043509
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, 3 figures, version to be published at Phys. Rev. D
Scientific paper
10.1103/PhysRevD.62.043509
A slow-rolling scalar field ($Q\equiv$ Quintessence) with potential energy $V_Q\sim (3\times 10^{-3} {\rm eV})^4$ has been proposed as the origin of accelerating universe at present. We investigate the effective potential of $Q$ in the framework of supergravity model including the quantum corrections induced by generic (nonrenormalizable) couplings of $Q$ to the gauge and charged matter multiplets. It is argued that the K\"ahler potential, superpotential and gauge kinetic functions of the underlying supergravity model are required to be invariant under the variation of $Q$ with an extremely fine accuracy in order to provide a working quintessence potential. Applying these results for string or $M$-theory, we point out that the heterotic $M$-theory or Type I string axion can be a plausible candidate for quintessence if (i) it does not couple to the instanton number of gauge interactions not weaker than those of the standard model and (ii) the modulus partner ${\rm Re}(Z)$ of the periodic quintessence axion ${\rm Im}(Z)\equiv {\rm Im}(Z)+1$ has a large VEV: ${\rm Re}(Z)\sim \frac{1}{2\pi}\ln(m_{3/2}^2 M_{Planck}^2/V_Q)$. It is stressed that such a large ${\rm Re}(Z)$ gives the gauge unification scale at around the phenomenologically favored value $3\times 10^{16}$ GeV. To provide an accelerating universe, the quintessence axion should be at near the top of its effective potential at present, which requires a severe fine tuning of the initial condition of $Q$ and $\dot{Q}$ in the early universe. We discuss a late time inflation scenario based on the modular and CP invariance of the moduli effective potential, yielding the required initial condition in a natural manner if the K\"ahler metric of the quintessence axion superfield receives a sizable nonperturbative contribution.
No associations
LandOfFree
String or M theory axion as a quintessence does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with String or M theory axion as a quintessence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and String or M theory axion as a quintessence will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-297006