The KBC void and Hubble tension contradict Lambda CDM on a Gpc scale - Milgromian dynamics as a possible solution

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10423413" target="_blank" >RIV/00216208:11320/20:10423413 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=h.04H77Tdb" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=h.04H77Tdb</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/staa2348" target="_blank" >10.1093/mnras/staa2348</a>

Result language

angličtina

Original language name

The KBC void and Hubble tension contradict Lambda CDM on a Gpc scale - Milgromian dynamics as a possible solution

Original language description

The KBC void is a local underdensity with the observed relative density contrast delta equivalent to 1 - rho/rho(0) = 0.46 +/- 0.06 between 40 and 300 Mpc around the Local Group. If mass is conserved in the Universe, such a void could explain the 5.3 sigma Hubble tension. However, the MXXL simulation shows that the KBC void causes 6.04s tension with standard cosmology (Lambda CDM). Combined with the Hubble tension, Lambda CDM is ruled out at 7.09 sigma confidence. Consequently, the density and velocity distribution onGpc scales suggest a long-range modification to gravity. In this context, we consider a cosmologicalMONDmodel supplemented with 11 eV/c(2) sterile neutrinos. We explain why this.HDM model has a nearly standard expansion history, primordial abundances of light elements, and cosmic microwave background (CMB) anisotropies. InMOND, structure growth is self-regulated by external fields from surrounding structures. We constrain our model parameters with the KBC void density profile, the local Hubble and deceleration parameters derived jointly from supernovae at redshifts 0.023-0.15, time delays in strong lensing systems, and the Local Group velocity relative to the CMB. Our best-fitting model simultaneously explains these observables at the 1.14 per cent confidence level (2.53 sigma tension) if the void is embedded in a time-independent external field of 0.055 a(0). Thus, we show for the first time that the KBC void can naturally resolve the Hubble tension in Milgromian dynamics. Given the many successful a priori MOND predictions on galaxy scales that are difficult to reconcile with Lambda CDM, Milgromian dynamics supplemented by 11 eV/c(2) sterile neutrinos may provide a more holistic explanation for astronomical observations across all scales.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

—

Volume of the periodical

499

Issue of the periodical within the volume

2

Country of publishing house

GB - UNITED KINGDOM

Number of pages

39

Pages from-to

2845-2883

UT code for WoS article

000587762900096

EID of the result in the Scopus database

2-s2.0-85096590293