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arXiv 1902.11014hep-thastro-ph.COgr-qc
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超越本质的暗能量:来自沼泽地的限制

Dark energy beyond quintessence: Constraints from the swampland

Suddhasattwa Brahma, Md. Wali Hossain

摘要:

弦论沼泽地提出,对于具有精确(亚稳态)德西特真空的有效场论,不存在UV完备性,因此如果认真对待这个猜想,就排除了标准的$Λ$ CDM宇宙学。沼泽地的标准也被证明是在尖锐的紧张局势与精华模型在当前和即将到来的观测范围。作为一个合乎逻辑的下一步,我们在低能量有效拉格朗日函数中引入高阶导数自相互作用,并表明对于一些特定的模型,可以满足观测约束以及沼泽地准则。特别是,三次Galileon项,在指数潜力的存在下,检查证明部分Horndeski参数空间生存的沼泽地,并导致可行的宇宙学历史。

英文摘要:

The string theory swampland proposes that there is no UV-completion for an effective field theory with an exact (metastable) de Sitter vacua, thereby ruling out standard $Λ$CDM cosmology if the conjecture is taken seriously. The swampland criteria have also been shown to be in sharp tension with quintessence models under current and forthcoming observational bounds. As a logical next step, we introduce higher derivative self-interactions in the low-energy effective Lagrangian and show that one can satisfy observational constraints as well as the swampland criteria for some specific models. In particular, the cubic Galileon term, in the presence of an exponential potential, is examined to demonstrate that parts of the Horndeski parameter space survives the swampland and leads to viable cosmological histories.

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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