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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/LUC23115" target="_blank" >LUC23115: Spin 2 WISPers from the laboratory to the cosmos</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

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

Name of the periodical

Physical Review D

ISSN

2470-0010

e-ISSN

2470-0029

Volume of the periodical

111

Issue of the periodical within the volume

10

Country of publishing house

US - UNITED STATES

Number of pages

17

Pages from-to

104023

UT code for WoS article

001491244000009

EID of the result in the Scopus database

2-s2.0-105005275100