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arXiv 0907.4981astro-ph.COhep-ph
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相互作用暗能量模型中微扰的绝热初始条件

Adiabatic initial conditions for perturbations in interacting dark energy models

Elisabetta Majerotto, Jussi Valiviita, Roy Maartens

摘要:

我们对相互作用暗能量模型中的早期辐射时代解进行了新的系统分析,以找到玻尔兹曼积分的绝热初始条件。在一个相互作用正比于暗物质密度的模型中,如果早期暗能量状态方程参数为$w_e > -4/5$,绝热初始条件和可行的宇宙学是可能的。我们发现,当冷暗物质、重子、中微子和光子之间的绝热性被要求时,暗能量分量自动满足绝热性条件。由于Ia超新星或重子声学振荡数据要求最近时间状态方程参数更负,我们在模型中考虑了时变状态方程。在一篇配套论文[arXiv:0907.4987]中,我们应用了这里推导出的初始条件,并对此模型进行了完整的蒙特卡洛马尔可夫链似然分析。

英文摘要:

We present a new systematic analysis of the early radiation era solution in an interacting dark energy model to find the adiabatic initial conditions for the Boltzmann integration. In a model where the interaction is proportional to the dark matter density, adiabatic initial conditions and viable cosmologies are possible if the early-time dark energy equation of state parameter is $w_e > -4/5$. We find that when adiabaticity between cold dark matter, baryons, neutrinos and photons is demanded, the dark energy component satisfies automatically the adiabaticity condition. As supernovae Ia or baryon acoustic oscillation data require the recent-time equation of state parameter to be more negative, we consider a time-varying equation of state in our model. In a companion paper [arXiv:0907.4987] we apply the initial conditions derived here, and perform a full Monte Carlo Markov Chain likelihood analysis of this model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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