Stable cosmology in ghost-free quasidilaton theory
Stable cosmology in ghost-free quasidilaton theory
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DOI：
10.1103/physrevd.96.044041
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发表时间：
2017-07
影响因子：
5
通讯作者：
A. E. Gümrükçüoğlu;K. Koyama;S. Mukohyama
中科院分区：
文献类型：
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作者：
A. E. Gümrükçüoğlu;K. Koyama;S. Mukohyama
我们在最近经过审查的扩展准化理论框架中提出了一种新颖的宇宙学解决方案。我们只考虑不产生Boulware-Deser自由度的项，因此提出“无幽灵”准扩张理论，并在其中展示了宇宙演化的三个新分支。其中一种解决方案通过了微扰稳定性测试。这个新的解决方案表现出后期自加速，并且所有引力子极化都获得在渐近未来收敛到常数的质量。此外，所有模式都以光速传播。我们建议该解决方案可以用作未来现象学研究的基准模型。
We present a novel cosmological solution in the framework of extended quasidilaton theory which underwent scrutiny recently. We only consider terms that do not generate the Boulware-Deser degree of freedom, hence the "ghost-free" quasidilaton theory, and show three new branches of cosmological evolution therein. One of the solutions passes the perturbative stability tests. This new solution exhibits a late time self-acceleration and all graviton polarizations acquire masses that converge to a constant in the asymptotic future. Moreover, all modes propagate at the speed of light. We propose that this solution can be used as a benchmark model for future phenomenological studies.