标题： 标量张量模型中的加速宇宙——理论预言与观测的对比 显示英文标题

标题： Accelerating universe in scalar tensor models - confrontation of theoretical predictions with observations

摘要： 我们研究了标量张量引力理论，假设标量场与引力非最小耦合。 我们用这一理论来研究平坦均匀各向同性宇宙的演化。 在这种情况下，动力学方程可以从点状拉格朗日量推导出来。 我们研究了该系统的动力学一般性质，并表明对于广泛的初始条件，这类模型自然会导致宇宙膨胀加速阶段。 假设点状拉格朗日量允许诺特定征，我们可以显式求解动力学方程。 我们研究了一个具体的模型，并表明其预测与观测数据兼容，即Ia型超新星公开可用的数据，由2度场星系红移巡天确定的大尺度结构参数（2dFGRS），利用SZ效应测量的宇宙距离以及密度扰动增长速率。 结果表明，该模型具有一个非常有趣的特性，即自然产生加速膨胀时期。 通过适当选择参数，我们的模型完全符合宇宙的几个观测特征。 显示英文摘要

摘要： We consider scalar tensor theories of gravity assuming that the scalar field is non minimally coupled with gravity. We use this theory to study evolution of a flat homogeneous and isotropic universe. In this case the dynamical equations can be derived form a point like Lagrangian. We study the general properties of dynamics of this system and show that for a wide range of initial conditions such models lead in a natural way to an accelerated phase of expansion of the universe. Assuming that the point like Lagrangian admits a Noether symmetry we are able to explicitly solve the dynamical equations. We study one particular model and show that its predictions are compatible with observational data, namely the publicly available data on type Ia supernovae, the parameters of large scale structure determined by the 2-degree Field Galaxy Redshift Survey (2dFGRS), the measurements of cosmological distances with the Sunyaev-Zel'dovich effect and the rate of growth of density perturbations}{It turns out that this model have a very interesting feature of producing in a natural way an epoch of accelerated expansion. With an appropriate choice of parameters our model is fully compatible with several observed characteristics of the universe