Journal
PHYSICAL REVIEW D
Volume 103, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.103.L081305
Keywords
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Funding
- Korea Ministry of Science, ICT & Future Planning, Gyeongsangbuk-do and Pohang City
- European Research Council (ERC) under the European Unions Horizon 2020 research and innovation program [801781]
- Swiss National Science Foundation [179740]
- INSF [950124]
- Saramadan Grant [ISEF/M/98204]
- National Research Foundation of Korea [2020R1A2C1102899] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Local determinations of the Hubble constant H-0 based on low redshift data favor quintessence models that lower H-0 relative to Lambda CDM. Additionally, results show that an exponential coupling to dark matter cannot alter this conclusion in the same redshift range. This leaves open the possibility that a coupling in the matter-dominated epoch, potentially even in the dark ages, may yet save H-0 from sinking in the string theory swampland.
Local determinations of the Hubble constant H-0 favor a higher value than Planck based on cosmic microwave background and Lambda cold dark matter (Lambda CDM). Through a model-independent expansion, we show that low redshift (z less than or similar to 0.7) data comprising baryon acoustic oscillations, cosmic chronometers, and Type Ia supernovae have a preference for quintessence models that lower H-0 relative to Lambda CDM. 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 H-0 from sinking in the string theory swampland.
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