标题： 遗迹引力波和目前的加速膨胀 显示英文标题

标题： Relic gravitational waves and present accelerated expansion

摘要： 我们计算了大爆炸时产生的引力波的当前功率谱（以及在宇宙膨胀过程中不同过渡期间被放大的部分），并考虑了目前加速膨胀阶段的影响。 同样，我们确定了一个假设的第二个尘埃时期内的功率谱，如果在未来的某个时间，目前驱动加速膨胀的暗能量演化成与冷暗物质动力学等效的形式，那么目前的时期之后将出现这样的第二个尘埃时期。 计算得到的功率谱以及波的密度参数的演化可能有助于区分不同的膨胀阶段，并可能帮助确定暗能量的性质。 显示英文摘要

摘要： We calculate the current power spectrum of the gravitational waves created at the big bang (and later amplified by the different transitions during the Universe expansion) taking into account the present stage of accelerated expansion. Likewise, we determine the power spectrum in a hypothetical second dust era that would follow the present one if at some future time the dark energy, that supposedly drives the current accelerated expansion, evolved in such a way that it became dynamically equivalent to cold dark matter. The calculated power spectrum as well as the evolution of the density parameter of the waves may serve to discriminate between phases of expansion and may help ascertain the nature of dark energy.