f(T) gravity: background dependence and propagating degrees of freedom

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F25%3A00635570" target="_blank" >RIV/68378271:_____/25:00635570 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1103/PhysRevD.111.104023" target="_blank" >https://doi.org/10.1103/PhysRevD.111.104023</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevD.111.104023" target="_blank" >10.1103/PhysRevD.111.104023</a>

Jazyk výsledku

angličtina

Název v původním jazyce

f(T) gravity: background dependence and propagating degrees of freedom

Popis výsledku v původním jazyce

The standard cosmological model, rooted in general relativity (GR), has achieved remarkable success, yet it still faces unresolved issues like the nature of dark matter, dark energy, and the Hubble tension. These challenges might imply the need for alternative gravitational theories. Teleparallel gravity offers a compelling framework by reformulating the gravitational interaction using torsion, rather than curvature, as its fundamental geometrical property. This paper delves into f(T) gravity, an extension of the teleparallel equivalent of general relativity (TEGR), which introduces nonlinear modifications of the torsion scalar T. We focus on the role of spacetime-dependent Lorentz transformations in the vierbein formalism, examining their impact on both background solutions and perturbation dynamics. Special attention is given to the homogeneous and isotropic Friedmann-Lemaître-Robertson-Walker (FLRW) spacetime, as well as the anisotropic Bianchi I spacetime. Furthermore, the analysis of the propagating degrees of freedom on these spacetimes is performed. While it is well established that TEGR reproduces the same results as GR, the propagating degrees of freedom in its nonlinear extension, f(T) gravity, is still debated in the literature. In this work, we find that only two fields propagate in the gravity sector, independent of the background spacetime considered, either FLRW or Bianchi I. Although not definitive, this paper provides fresh insights into the issue of the propagating degrees of freedom in f(T) gravity, opening the door to intriguing new directions for further investigation.n

Název v anglickém jazyce

f(T) gravity: background dependence and propagating degrees of freedom

Popis výsledku anglicky

The standard cosmological model, rooted in general relativity (GR), has achieved remarkable success, yet it still faces unresolved issues like the nature of dark matter, dark energy, and the Hubble tension. These challenges might imply the need for alternative gravitational theories. Teleparallel gravity offers a compelling framework by reformulating the gravitational interaction using torsion, rather than curvature, as its fundamental geometrical property. This paper delves into f(T) gravity, an extension of the teleparallel equivalent of general relativity (TEGR), which introduces nonlinear modifications of the torsion scalar T. We focus on the role of spacetime-dependent Lorentz transformations in the vierbein formalism, examining their impact on both background solutions and perturbation dynamics. Special attention is given to the homogeneous and isotropic Friedmann-Lemaître-Robertson-Walker (FLRW) spacetime, as well as the anisotropic Bianchi I spacetime. Furthermore, the analysis of the propagating degrees of freedom on these spacetimes is performed. While it is well established that TEGR reproduces the same results as GR, the propagating degrees of freedom in its nonlinear extension, f(T) gravity, is still debated in the literature. In this work, we find that only two fields propagate in the gravity sector, independent of the background spacetime considered, either FLRW or Bianchi I. Although not definitive, this paper provides fresh insights into the issue of the propagating degrees of freedom in f(T) gravity, opening the door to intriguing new directions for further investigation.n

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/LUC23115" target="_blank" >LUC23115: Spin 2 WISPers z laboratoře do vesmíru</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

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

2470-0029

Svazek periodika

111

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

17

Strana od-do

104023

Kód UT WoS článku

001491244000009

EID výsledku v databázi Scopus

2-s2.0-105005275100