Hydrodynamic effects in the symmetron and f(R)-gravity models
Hydrodynamic effects in the symmetron and f(R)-gravity models
复制标题
symmetron 和 f(R)-重力模型中的流体动力学效应
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
H. Winther
中科院分区：
文献类型：
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作者：
Amir Hammami;C. Llinares;D. Mota;H. Winther
在本文中，我们提出的第一个结果，从实施两个标量张量修改的引力理论，的duplex和胡-Sawicki $f（R）$-引力模型，到流体动力学N体代码与暗物质粒子和重子理想气体。这项研究是以前的工作的延续，其中的dronon和$f（R）$已成功地实现了RAMSES代码，但暗物质。通过运行模拟，我们表明，从$\Lambda$CDM在这些模型中的气体密度分布的偏差显着低于暗物质当量。当涉及到的物质功率谱，我们发现，流体动力学模拟同意非常好的暗物质只有模拟，只要我们考虑的尺度大于$k\sim 0.5$ h/Mpc。一般来说，修正引力对重子气体的影响并不总是反映它对暗物质的影响。当考虑温度分布时，发现最大的签名。我们发现，在这里研究的修改后的重力模型中的气体温度显示出偏差，相比$\Lambda$CDM，这可以是一个因素的几个大于密度分布和功率谱中发现的偏差。
In this paper we present the first results from implementing two scalar-tensor modified gravity theories, the symmetron and the Hu-Sawicki $f(R)$-gravity model, into a hydrodynamic N-body code with dark matter particles and a baryonic ideal gas. The study is a continuation of previous work where the symmetron and $f(R)$ have been successfully implemented in the RAMSES code, but for dark matter only. By running simulations, we show that the deviation from $\Lambda$CDM in these models for the gas density profiles are significantly lower than the dark matter equivalents. When it comes to the matter power-spectrum we find that hydrodynamic simulations agree very well with dark matter only simulations as long as we consider scales larger than $k\sim 0.5$ h/Mpc. In general the effects of modified gravity on the baryonic gas is found to not always mirror the effects it has on the dark matter. The largest signature is found when considering temperature profiles. We find that the gas temperatures in the modified gravity model studied here show deviations, when compared to $\Lambda$CDM, that can be a factor of a few larger than the deviations found in density profiles and power spectra.
影响因子：
64.8
作者：
M. Vogelsberger;S. Genel;V. Springel;P. Torrey;D. Sijacki;Da Xu;G. Snyder;Simeon Bird;D. Nelson;Lars Hernquist Mit;HarvardCfA;Hits;I. Cambridge;Stsci;Ias Princeton
通讯作者：
M. Vogelsberger;S. Genel;V. Springel;P. Torrey;D. Sijacki;Da Xu;G. Snyder;Simeon Bird;D. Nelson;Lars Hernquist Mit;HarvardCfA;Hits;I. Cambridge;Stsci;Ias Princeton