标题： 耦合的双指数势 quintessence 显示英文标题

标题： Coupled quintessence with double exponential potentials

摘要： 我们研究具有完美流体物质源和与物质非最小耦合的标量场的平坦弗里德曼-罗伯森-沃尔克（FRW）模型，该标量场具有双指数势能。 结果显示，标量场几乎总是发散到无穷大。 在参数空间的条件下，我们表明该模型能够给出我们宇宙可接受的宇宙学历史，即短暂的物质时代之后跟随一个加速的未来吸引子。 发现只有非常弱的耦合才能导致可行的宇宙学。 我们在爱因斯坦框架下研究了一类预测加速的f(R)理论的渐近形式的宇宙学可行性。 简要讨论了耦合常数的作用。 显示英文摘要

摘要： We study flat Friedmann-Robertson-Walker (FRW) models with a perfect fluid matter source and a scalar field non minimally coupled to matter having a double exponential potential. It is shown that the scalar field almost always diverges to infinity. Under conditions on the parameter space, we show that the model is able to give an acceptable cosmological history of our universe, that is, a transient matter era followed by an accelerating future attractor. It is found that only a very weak coupling can lead to viable cosmology. We study in the Einstein frame, the cosmological viability of the asymptotic form of a class of f(R) theories predicting acceleration. The role of the coupling constant is briefly discussed.