String or M Theory Axion as a Quintessence

A slow-rolling scalar field (Q= Quintessence) with potenial energy $V_Q\sim (3\times 10^{-3} eV)^4$ 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. 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 $Re(Z)$ of the periodic quintessence axion $Im(Z)=Im(Z)+1$ has a large VEV: $Re(Z)\sim 1/2 \pi}\ln(m_{3/2}^2 M_{Planck}^2/V_Q)$. It is stressed that such a large $Re(Z)$ gives the gauge unification scale at around the phenomenologically favored value $3\times 10^{16}$ GeV. To have a negative pressure, at present the quintessence axion is required to be at near the top of its effective potential. We discuss a scenario which would yield such present value of the quintessence axion in a natural manner.