Simple-graduated dark energy and spatial curvature

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10440144" target="_blank" >RIV/00216208:11320/21:10440144 - isvavai.cz</a>

Výsledek na webu

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

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevD.104.023505" target="_blank" >10.1103/PhysRevD.104.023505</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Simple-graduated dark energy and spatial curvature

Popis výsledku v původním jazyce

In this work, we first discuss the possibility that dark energy models with negative energy density values in the past can alleviate the H-0 tension, as well as the discrepancy with the baryon acoustic oscillation (BAO) Lyman-alpha data, both which prevail within the Lambda CDM model. We then investigate whether two minimal extensions of the Lambda CDM model, together or separately, can successfully realize such a scenario: (i) the spatial curvature, which, in the case of spatially closed universe, mimics a negative density source and (ii) simple-graduated dark energy (gDE), which promotes the null inertial mass density of the usual vacuum energy to an arbitrary constant-if negative, the corresponding energy density decreases with redshift similar to the phantom models, but unlike them crosses below zero at a certain redshift. We find that, when the Planck data are not included in the observational analysis, the models with simple-gDE predict interesting and some significant deviations from the Lambda CDM model. In particular, a spatially closed universe along with a simple-gDE of positive inertial mass density, which work in contrast to each other, results in minor improvement to the H-0 tension. The joint dataset, including the Planck data, presents no evidence for a deviation from spatial flatness but almost the same evidence for a cosmological constant and the simple-gDE with an inertial mass density of order O(10(-12)) eV(4) . The latter case predicts almost no deviation from the Lambda CDM model up until today-so that it results in no improvement regarding the BAO Ly-alpha data-except that it slightly aggravates the H-0 tension. We also study via dynamical analysis the history of the Universe in the models, as the simple-gDE results in futures different than the de Sitter future of the Lambda CDM model.

Název v anglickém jazyce

Simple-graduated dark energy and spatial curvature

Popis výsledku anglicky

In this work, we first discuss the possibility that dark energy models with negative energy density values in the past can alleviate the H-0 tension, as well as the discrepancy with the baryon acoustic oscillation (BAO) Lyman-alpha data, both which prevail within the Lambda CDM model. We then investigate whether two minimal extensions of the Lambda CDM model, together or separately, can successfully realize such a scenario: (i) the spatial curvature, which, in the case of spatially closed universe, mimics a negative density source and (ii) simple-graduated dark energy (gDE), which promotes the null inertial mass density of the usual vacuum energy to an arbitrary constant-if negative, the corresponding energy density decreases with redshift similar to the phantom models, but unlike them crosses below zero at a certain redshift. We find that, when the Planck data are not included in the observational analysis, the models with simple-gDE predict interesting and some significant deviations from the Lambda CDM model. In particular, a spatially closed universe along with a simple-gDE of positive inertial mass density, which work in contrast to each other, results in minor improvement to the H-0 tension. The joint dataset, including the Planck data, presents no evidence for a deviation from spatial flatness but almost the same evidence for a cosmological constant and the simple-gDE with an inertial mass density of order O(10(-12)) eV(4) . The latter case predicts almost no deviation from the Lambda CDM model up until today-so that it results in no improvement regarding the BAO Ly-alpha data-except that it slightly aggravates the H-0 tension. We also study via dynamical analysis the history of the Universe in the models, as the simple-gDE results in futures different than the de Sitter future of the Lambda CDM model.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10300 - Physical sciences

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Physical Review D

ISSN

2470-0010

e-ISSN

—

Svazek periodika

104

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

18

Strana od-do

023505

Kód UT WoS článku

000670703100005

EID výsledku v databázi Scopus

2-s2.0-85109272523