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Perturbations In A Non-Uniform Dark Energy Fluid: Equations Reveal Effects of Modified Gravity and Dark Matter

机译:非均匀暗能量流体中的扰动:方程显示   改性重力和暗物质的影响

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摘要

We propose a unified single-field description of the galactic Dark Matter andvarious uniform scalar fields for the inflation and cosmological constant. Thetwo types of effects could originate from a fluid of both spatially andtemporally varying Vacuum Energy if the vacuum has an uneven pressure caused bya photon-like vector field (of perhaps an unstable massive boson). We propose amost general Lagrangian with a {\bf N}on-{\bf u}niform Cosmological Constantfor this vacuum fluid (dubbed as a Nu-Lambda fluid), working within theframework of Einsteinian gravity. This theory includes a continuous spectrum ofplausible dark energy theories and gravity theories, e.g., inflation,quintessence, k-essence, f(R), Generalized Einstein-Aether f(K), MOND, TeVeS,BSTV etc. theories. It also suggests new models such as a certain f(K+R) model,which suggests intriguing corrections to MOND depending of redshift anddensity. Some specific constructions of the Nu-Lambda fluid (e.g., Zhao'sV-$\Lambda$ model) closely resemble the $\Lambda$CDM cosmology on large scale,but fit galaxy rotation curves as good as MOND. Perturbed Einstein Equations ina simple $f(K_4)$ model are solvable and show effects of a DM coupled to DE.Incorporating the perturbation equations here into standard simulations forcosmological structure growth offers a chance to falsify examples of theNu-Lambda theories.
机译:我们提出了关于银河暗物质和各种统一标量场的统一的单场描述,以用于膨胀和宇宙常数。如果真空具有由光子状矢量场(可能是不稳定的大玻色子)引起的不均匀压力,则这两种类型的效应可能源于时空变化的真空能流体。我们为这种真空流体(称为Nu-Lambda流体)提出了一个具有{\ bf N} on-{\ bf u} niform宇宙常数的最一般的拉格朗日算子,在爱因斯坦引力的框架内工作。该理论包括合理的暗能量理论和引力理论的连续频谱,例如通货膨胀,精粹,k本质,f(R),广义爱因斯坦-以太f(K),MOND,TeVeS,BSTV等理论。它还提出了一些新的模型,例如某个f(K + R)模型,该模型提出了根据红移和密度对MOND进行有趣的修正的方法。 Nu-Lambda流体的某些特定构造(例如Zhao的V-$ \ Lambda $模型)在很大程度上与$ \ Lambda $ CDM宇宙学非常相似,但拟合的星系旋转曲线与MOND一样好。一个简单的$ f(K_4)$模型中的扰动的爱因斯坦方程是可解的,并且显示了DM与DE耦合的效果。将此处的扰动方程式纳入标准模拟以促进宇宙学结构的增长为伪造Nu-Lambda理论示例提供了机会。

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