Chameleon early dark energy and the Hubble tension
Chameleon early dark energy and the Hubble tension
复制标题
变色龙早期暗能量和哈勃张力
作者：
Tanvi Karwal;M. Raveri;B. Jain;J. Khoury;M. Trodden
早期暗能量（EDE）为哈勃张力提供了一个特别有趣的理论方法，尽管它引入了自己的一系列挑战，包括一个新的“为什么”问题，与物质辐射平等的EDE注入时间有关，以及大尺度结构（LSS）张力的轻微恶化。这两个挑战都集中在暗物质的性质上，暗物质在EDE注入时成为宇宙的主要组成部分，也负责播种LSS。受此启发，我们提出了EDE和暗物质之间的耦合来解决这些挑战的潜力，重点是类似于变色龙暗能量理论的机制，认为这种变色龙早期暗能量（CEDE）。我们提出了相关的背景和扰动方程，并研究了四次标量势和指数耦合的情况下的动力学。
Early dark energy (EDE) offers a particularly interesting theoretical approach to the Hubble tension, albeit one that introduces its own set of challenges, including a new ‘why then’ problem related to the EDE injection time at matter-radiation equality, and a mild worsening of the largescale structure (LSS) tension. Both these challenges center on the properties of dark matter, which becomes the dominant component of the Universe at EDE injection and is also responsible for seeding LSS. Motivated by this, we present the potential of couplings between EDE and dark matter to address these challenges, focusing on a mechanism similar to chameleon dark energy theories, deeming this chameleon early dark energy (CEDE). We present relevant background and perturbation equations and study the dynamics of the case of a quartic scalar potential and an exponential coupling.