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Does the Hubble constant tension call for new physics?
Edvard Mörtsell and Suhail Dhawan 1801.07260
Size of Universe compared to today Billion years from today
Does the Hubble constant tension call for new physics? Edvard - - PowerPoint PPT Presentation
Does the Hubble constant tension call for new physics? Edvard - - PowerPoint PPT Presentation
Does the Hubble constant tension call for new physics? Edvard Mrtsell and Suhail Dhawan 1801.07260 The Hubble constant ( H 0 ) Size of Universe compared to today Billion years from today Local CMB Freedman, Nature Astronomy 1 Cosmic
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Freedman, Nature Astronomy 1
Local CMB
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Planck
Cosmic Microwave Background (CMB)
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Tritonstation.wordpress.com
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Planck 2015 results. XIV. Dark energy and modified gravity
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Conclusions
The CMB inferred Hubble constant is low assuming ΛCDM, but the value is very model dependent
- 1. Decrease the expansion rate faster up to z = 1100
Impossible to realize fully given other distance data
- 2. Change the physical size of the CMB fluctuations by changing the
expansion speed at z > 1100 Works better, indicating additional semi-relativistic energy in the early Universe
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Does the Hubble constant tension call for new physics?
Edvard Mörtsell and Suhail Dhawan 1801.07260
- If you believe the local measurements, it is a hint
- If the tension persists with 1 % local H0, it would
constitute strong evidence
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Local measurements (SHOES)
NGC 4258 maser Open University "Galaxies and Cosmology”
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