Hydrodynamical structure formation in Milgromian cosmology

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F23%3A10476053" target="_blank" >RIV/00216208:11320/23:10476053 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=XrnjQ-b5Vx" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=XrnjQ-b5Vx</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/stad1371" target="_blank" >10.1093/mnras/stad1371</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Hydrodynamical structure formation in Milgromian cosmology

Popis výsledku v původním jazyce

We present the first hydrodynamical cosmological simulations in the nu HDM framework based on Milgromian dynamics (MOND) with light (11 eV) sterile neutrinos. nu HDM can explain the expansion history, CMB anisotropies, and galaxy cluster dynamics similarly to standard cosmology while preserving MOND&apos;s successes on galaxy scales, making this the most conservative Milgromian framework. We generate initial conditions including sterile neutrinos using CAMB and MUSIC and modify the publicly available code PHANTOM OF RAMSES to run.HDM models. The simulations start at redshift z(e) = 199, when the gravitational fields are stronger than a(0) provided this does not vary. We analyse the growth of structure and investigate the impact of resolution and box size, which is at most 600 comoving Mpc. Large density contrasts arise at late times, which may explain the KBC void and Hubble tension. We quantify the mass function of formed structures at different redshifts. We show that the sterile neutrino mass fraction in these structures is similar to the cosmic fraction at high masses (consistent with MOND dynamical analyses) but approaches zero at lower masses, as expected for galaxies. We also identify structures with a low peculiar velocity comparable to the Local Group, but these are rare. The onset of group/cluster-scale structure formation at z(e) approximate to 4 appears to be in tension with observations of high redshift galaxies, which we discuss in comparison to prior analytical work in a MONDian framework. The formation of a cosmic web of filaments and voids demonstrates that this is not unique to standard Einstein/Newton-based cosmology.

Název v anglickém jazyce

Hydrodynamical structure formation in Milgromian cosmology

Popis výsledku anglicky

We present the first hydrodynamical cosmological simulations in the nu HDM framework based on Milgromian dynamics (MOND) with light (11 eV) sterile neutrinos. nu HDM can explain the expansion history, CMB anisotropies, and galaxy cluster dynamics similarly to standard cosmology while preserving MOND&apos;s successes on galaxy scales, making this the most conservative Milgromian framework. We generate initial conditions including sterile neutrinos using CAMB and MUSIC and modify the publicly available code PHANTOM OF RAMSES to run.HDM models. The simulations start at redshift z(e) = 199, when the gravitational fields are stronger than a(0) provided this does not vary. We analyse the growth of structure and investigate the impact of resolution and box size, which is at most 600 comoving Mpc. Large density contrasts arise at late times, which may explain the KBC void and Hubble tension. We quantify the mass function of formed structures at different redshifts. We show that the sterile neutrino mass fraction in these structures is similar to the cosmic fraction at high masses (consistent with MOND dynamical analyses) but approaches zero at lower masses, as expected for galaxies. We also identify structures with a low peculiar velocity comparable to the Local Group, but these are rare. The onset of group/cluster-scale structure formation at z(e) approximate to 4 appears to be in tension with observations of high redshift galaxies, which we discuss in comparison to prior analytical work in a MONDian framework. The formation of a cosmic web of filaments and voids demonstrates that this is not unique to standard Einstein/Newton-based cosmology.

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

523

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

21

Strana od-do

453-473

Kód UT WoS článku

000995754400012

EID výsledku v databázi Scopus

2-s2.0-85161290874