Traversable wormhole model with massive gravitons, two fluids, and a variable gravity

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F24%3A00616584" target="_blank" >RIV/60077344:_____/24:00616584 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1139/cjp-2023-0033" target="_blank" >https://doi.org/10.1139/cjp-2023-0033</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1139/cjp-2023-0033" target="_blank" >10.1139/cjp-2023-0033</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Traversable wormhole model with massive gravitons, two fluids, and a variable gravity

Popis výsledku v původním jazyce

We construct a new cosmological model based on relativistic theory of gravity characterized by massive gravitons. The new Friedmann-Robertson-Walker model is characterized by the presence of a static traversable wormhole, massive gravitons, and a variable gravitational coupling constant. To recover the Bianchi identity, a second cosmic fluid is introduced in the theory. Motivated from cosmic dark radiation phenomenological arguments, which suggest that the dynamical component of dark energy could be dominated by a bath of dark radiation, we assume that the original cosmic fluid is radiative, whereas the new cosmic fluid is phantom. The total equation of state of our model is equal to1. The new model is characterized by an effective Hubble parameter. The solutions of the dynamical equations reveal an accelerated universe with a scale factor of hyperbolic type which allows the deceleration parameter to change sign from a decelerating phase to an accelerating phase. We have evaluated the deceleration parameter, the jerk and the present day variations of the gravitational constant which agree with astronomical observations.

Název v anglickém jazyce

Traversable wormhole model with massive gravitons, two fluids, and a variable gravity

Popis výsledku anglicky

We construct a new cosmological model based on relativistic theory of gravity characterized by massive gravitons. The new Friedmann-Robertson-Walker model is characterized by the presence of a static traversable wormhole, massive gravitons, and a variable gravitational coupling constant. To recover the Bianchi identity, a second cosmic fluid is introduced in the theory. Motivated from cosmic dark radiation phenomenological arguments, which suggest that the dynamical component of dark energy could be dominated by a bath of dark radiation, we assume that the original cosmic fluid is radiative, whereas the new cosmic fluid is phantom. The total equation of state of our model is equal to1. The new model is characterized by an effective Hubble parameter. The solutions of the dynamical equations reveal an accelerated universe with a scale factor of hyperbolic type which allows the deceleration parameter to change sign from a decelerating phase to an accelerating phase. We have evaluated the deceleration parameter, the jerk and the present day variations of the gravitational constant which agree with astronomical observations.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10102 - Applied mathematics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Canadian Journal of Physics

ISSN

0008-4204

e-ISSN

1208-6045

Svazek periodika

102

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

CA - Kanada

Počet stran výsledku

7

Strana od-do

271-277

Kód UT WoS článku

001158514500001

EID výsledku v databázi Scopus

2-s2.0-85190778156