A simultaneous solution to the Hubble tension and observed bulk flow within 250 h -1 Mpc

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F23%3A10476067" target="_blank" >RIV/00216208:11320/23:10476067 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=rZTmyWQ-iV" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=rZTmyWQ-iV</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/stad3357" target="_blank" >10.1093/mnras/stad3357</a>

Jazyk výsledku

angličtina

Název v původním jazyce

A simultaneous solution to the Hubble tension and observed bulk flow within 250 h -1 Mpc

Popis výsledku v původním jazyce

The Lambda cold dark matter (Lambda CDM) standard cosmological model is in severe tension with several cosmological observations. Foremost is the Hubble tension, which exceeds 5 sigma confidence. Galaxy number counts show the Keenan-Barger-Cowie (KBC) supervoid, a significant underdensity out to 300 Mpc that cannot be reconciled with Lambda CDM cosmology. Haslbauer et al. previously showed that a high local Hubble constant arises naturally due to gravitationally driven outflows from the observed KBC supervoid. The main prediction of this model is that peculiar velocities are typically much larger than expected in the Lambda CDM framework. This agrees with the recent discovery by Watkins et al. that galaxies in the CosmicFlows-4 catalogue have significantly faster bulk flows than expected in the Lambda CDM model on scales of 100 - 250 h(-1) Mpc. The rising bulk flow curve is unexpected in standard cosmology, causing 4.8 sigma tension at 200 h(-1) Mpc. In this work, we determine what the semi-analytic void model of Haslbauer et al. predicts for the bulk flows on these scales. We find qualitative agreement with the observations, especially if our vantage point is chosen to match the observed bulk flow on a scale of 50 h(-1) Mpc. This represents a highly non-trivial success of a previously published model that was not constrained by bulk flow measurements, but which was shown to solve the Hubble tension and explain the KBC void consistently with the peculiar velocity of the Local Group. Our results suggest that several cosmological tensions can be simultaneously resolved if structure grows more efficiently than in the Lambda CDM paradigm on scales of tens to hundreds of Mpc.

Název v anglickém jazyce

A simultaneous solution to the Hubble tension and observed bulk flow within 250 h -1 Mpc

Popis výsledku anglicky

The Lambda cold dark matter (Lambda CDM) standard cosmological model is in severe tension with several cosmological observations. Foremost is the Hubble tension, which exceeds 5 sigma confidence. Galaxy number counts show the Keenan-Barger-Cowie (KBC) supervoid, a significant underdensity out to 300 Mpc that cannot be reconciled with Lambda CDM cosmology. Haslbauer et al. previously showed that a high local Hubble constant arises naturally due to gravitationally driven outflows from the observed KBC supervoid. The main prediction of this model is that peculiar velocities are typically much larger than expected in the Lambda CDM framework. This agrees with the recent discovery by Watkins et al. that galaxies in the CosmicFlows-4 catalogue have significantly faster bulk flows than expected in the Lambda CDM model on scales of 100 - 250 h(-1) Mpc. The rising bulk flow curve is unexpected in standard cosmology, causing 4.8 sigma tension at 200 h(-1) Mpc. In this work, we determine what the semi-analytic void model of Haslbauer et al. predicts for the bulk flows on these scales. We find qualitative agreement with the observations, especially if our vantage point is chosen to match the observed bulk flow on a scale of 50 h(-1) Mpc. This represents a highly non-trivial success of a previously published model that was not constrained by bulk flow measurements, but which was shown to solve the Hubble tension and explain the KBC void consistently with the peculiar velocity of the Local Group. Our results suggest that several cosmological tensions can be simultaneously resolved if structure grows more efficiently than in the Lambda CDM paradigm on scales of tens to hundreds of Mpc.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

1365-2966

Svazek periodika

527

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

9

Strana od-do

4388-4396

Kód UT WoS článku

001112228300001

EID výsledku v databázi Scopus

2-s2.0-85179681827