4.4 Article

Crunching away the cosmological constant problem: dynamical selection of a small Λ

期刊

JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 12, 页码 -

出版社

SPRINGER
DOI: 10.1007/JHEP12(2020)191

关键词

Cosmology of Theories beyond the SM; AdS-CFT Correspondence; Conformal Field Theory

资金

  1. Alexander Zaks Scholarship
  2. Buchmann Scholarship
  3. Azrieli Foundation
  4. NSF [PHY-1719877]
  5. BSF [2016153]
  6. Israel Science Foundation [1302/19]
  7. United States-Israel Binational Science Foundation (BSF) [2018236]
  8. Israel Science Foundation-NSFC [2522/17]
  9. European Research Council (ERC) under the EU Horizon 2020 Programme (ERC-CoG-2015) [682676]
  10. Ambrose Monell Foundation by the Institute for Advanced Study
  11. European Research Council (ERC) [682676] Funding Source: European Research Council (ERC)

向作者/读者索取更多资源

We propose a novel explanation for the smallness of the observed cosmological constant (CC). Regions of space with a large CC are short lived and are dynamically driven to crunch soon after the end of inflation. Conversely, regions with a small CC are metastable and long lived and are the only ones to survive until late times. While the mechanism assumes many domains with different CC values, it does not result in eternal inflation nor does it require a long period of inflation to populate them. We present a concrete dynamical model, based on a super-cooled first order phase transition in a hidden conformal sector, that may successfully implement such a crunching mechanism. We find that the mechanism can only solve the CC problem up to the weak scale, above which new physics, such as supersymmetry, is needed to solve the CC problem all the way to the UV cutoff scale. The absence of experimental evidence for such new physics already implies a mild little hierarchy problem for the CC. Curiously, in this approach the weak scale arises as the geometric mean of the temperature in our universe today and the Planck scale, hinting at a new CC miracle, motivating new physics at the weak scale independent of electroweak physics. We further predict the presence of new relativistic degrees of freedom in the CFT that should be visible in the next round of CMB experiments. Our mechanism is therefore predictive and experimentally falsifiable.

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