Please use this identifier to cite or link to this item: https://www.um.edu.mt/library/oar/handle/123456789/89081
Title: Stability of the flat FLRW metric in f (T) gravity
Authors: Farrugia, Gabriel
Said, Jackson
Keywords: General relativity (Physics)
Einstein field equations
Relativity (Physics)
Gravitation
Issue Date: 2016
Publisher: American Physical Society
Citation: Farrugia, G., & Said, J. L. (2016). Stability of the flat FLRW metric in f (T) gravity. Physical Review D, 94(12), 124054.
Abstract: In this paper, we investigate the stability of the flat Friedmann-Lemaitre-Robertson-Walker metric in f (T ) gravity. This is achieved by analyzing the small perturbations, δ about the Hubble parameter and the matter energy density, δm. We find that δ ∝H ˙/H and δm∝H . Since the Hubble parameter depends on the function f (T ), two models were considered (A) the power-law model f (T )=α (-T )n, and (B) the exponential model f (T )=α T0(1 -exp [-p √{T/T0}] ) , where the parameters n and p were chosen to give comparable physical results. For the parameters considered, it was found that the solutions are stable with vanishing δ and decaying then constant δm, meaning that the matter perturbations persist during late times.
URI: https://www.um.edu.mt/library/oar/handle/123456789/89081
Appears in Collections:Scholarly Works - InsSSA

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