标题： 宇宙学奇异点在非规范暗能量模型中 显示英文标题

标题： Cosmological singularities in non-canonical models of dark energy

摘要： 暗能量真正本质的探索已成为现代宇宙学中极具吸引力的研究课题。 除了传统的宇宙常数方法外，人们提出了各种各样的想法，包括基于标量场的模型和各种修正引力方法。 一个特别引人入胜的概念是在量子引力驱动的宇宙学中探讨标量场暗能量模型，其中非规范理论在这个背景下脱颖而出，成为一个重要的候选者。 因此，在这项工作中，我们研究了三种广为人知的非规范标量场暗能量模型：幻影、拟质子和DBI暗能量模型。 通过采用 戈里利-海德程序，我们证明了这些框架内有限时间和无限时间都存在奇异性。 并且这些奇异性可以在不受系统初始条件影响的情况下显现出来。 此外，我们进一步确定了如何在这所有模型中产生I-IV类的宇宙奇异性。 这项工作表明，对于多种模型，暗能量的非规范阶段可以允许出现大多数显著的宇宙奇异性。 显示英文摘要

摘要： The pursuit of unraveling the true essence of dark energy has become an immensely captivating endeavor in modern cosmology. Alongside the conventional cosmological constant approach, a diverse range of ideas has been proposed, encompassing scalar field-based models and various modified gravity approaches. A particularly intriguing notion involves exploring scalar field dark energy models within quantum gravitationally motivated cosmologies, with non-canonical theories standing out as a prominent candidate in this context. Hence, in this work, we investigate three widely recognized non-canonical scalar field dark energy models: phantom, quintom, and DBI dark energy models. By employing the Goriely-Hyde procedure, we demonstrate the presence of singularities in both finite and infinite time within these frameworks. and that these singularities can manifest regardless of the system's initial conditions. Moreover, we further establish how cosmological singularities of types I-IV can arise in all of these models. The work goes to show that non-canonical regimes for dark energy can allow for most of the prominent cosmological singularities for a variety of models.