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The well-tempered cosmological constant: fugue in B♭
Journal of Cosmology and Astroparticle Physics ( IF 6.4 ) Pub Date : 2020-12-29 , DOI: 10.1088/1475-7516/2020/12/037
Stephen Appleby 1 , Eric V. Linder 2, 3
Affiliation  

Zero point fluctuations of quantum fields should generate a large cosmological constant energy density in any spacetime. How then can we have anything other than de Sitter space without fine tuning? Well tempering -- dynamical cancellation of the cosmological constant using degeneracy within the field equations -- can replace a large cosmological constant with a much lower energy state. Here we give an explicit mechanism to obtain a Minkowski solution, replacing the cosmological constant with zero, and testing its attractor nature and persistence through a vacuum phase transition. We derive the general conditions that Horndeski scalar-tensor gravity must possess, and evolve in a fugue of functions, to deliver nothing and make the universe be flat.

中文翻译:

温和的宇宙常数:B♭赋格

量子场的零点涨落应该在任何时空中产生大的宇宙学常数能量密度。那么我们怎么能在没有微调的情况下拥有德西特空间以外的任何东西呢?调和——使用场方程中的简并动态抵消宇宙常数——可以用低得多的能量状态代替大的宇宙常数。在这里,我们给出了获得闵可夫斯基解的明确机制,用零代替宇宙常数,并通过真空相变测试其吸引子的性质和持久性。我们推导出 Horndeski 标量张量引力必须具备的一般条件,并在函数的神游中演化,以不产生任何东西并使宇宙变得平坦。
更新日期:2020-12-29
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