Hubble sinks in the low-redshift swampland
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2021-04
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Journal Article
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yes
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Abstract
Local determinations of the Hubble constant H0 favor a higher value than Planck based on cosmic microwave background and Λ cold dark matter (ΛCDM). Through a model-independent expansion, we show that low redshift (z≲0.7) data comprising baryon acoustic oscillations, cosmic chronometers, and Type Ia supernovae have a preference for quintessence models that lower H0 relative to ΛCDM. In addition, we confirm that an exponential coupling to dark matter cannot alter this conclusion in the same redshift range. Our results leave open the possibility that a coupling in the matter-dominated epoch, potentially even in the dark ages, may yet save H0 from sinking in the string theory swampland. © 2021 American Physical Society
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published
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103 (8)
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American Physical Society
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09662 - Heisenberg, Lavinia (ehemalig) / Heisenberg, Lavinia (former)
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801781 - Modified Gravity on Trial (EC)
179740 - Multimessenger constraints of modified gravity (SNF)
179740 - Multimessenger constraints of modified gravity (SNF)