标题： 宇宙学中超引力跟踪势的启示 显示英文标题

标题： Cosmological Implications of the Supergravity Tracking Potential

摘要： 结果表明，由于当前标量场处于轨迹上时，真实的 quintessence 模型都应该基于超引力，即$Q\approx m_{\rm Pl}$。 这改善了理论预测与当前观测之间的吻合度。 特别是，一个普遍的性质是比值$\omega_{\rm Q}\equiv p_{\rm Q}/\rho_{\rm Q}$被推向 -1。 提出了一种弦理论启发的模型，其中势由$V(Q)= \frac{\Lambda ^{4+\alpha}}{Q^{\alpha}}e^{\frac{\kappa}{2}Q^2}$给出。 该模型预测$\omega_{\rm Q}\approx -0.82$，其值比当前似然值低不到一个标准差。 显示英文摘要

摘要： It is demonstrated that any realistic model of quintessence should be based on Supergravity since, when the scalar field is on tracks today, $Q\approx m_{\rm Pl}$. This improves the agreement between theoretical predictions and the current observations. In particular, a generic property is that ratio $\omega_{\rm Q}\equiv p_{\rm Q}/\rho_{\rm Q}$ is pushed towards -1. A string-inspired model is proposed where the potential is given by $V(Q)= \frac{\Lambda ^{4+\alpha}}{Q^{\alpha}}e^{\frac{\kappa}{2}Q^2}$. The model predicts $\omega_{\rm Q}\approx -0.82$, a value less that one sigma from the current likehood value.