A Probe into the Evolution of Primordial Perturbations in the <i>f</i>(<i>T</i>) Gravity Framework with Chaplygin Gas

A Probe into the Evolution of Primordial Perturbations in the <i>f</i>(<i>T</i>) Gravity Framework with Chaplygin Gas

This work is focused on studying the cosmology of variable modified Chaplygin gas (VMCG) in the framework of exponential and logarithmic <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>f</mi&g...

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Bibliographic Details
Main Authors: Sanjeeda Sultana, Surajit Chattopadhyay, Antonio Pasqua
Format: Article
Language:English
Published: MDPI AG 2024-10-01
Series:Particles
Subjects:
variable modified Chaplygin gas
exponential <i>f</i>(<i>T</i>) gravity
logarithmic <i>f</i>(<i>T</i>) gravity
primordial perturbations
Online Access:https://www.mdpi.com/2571-712X/7/4/57
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Summary:This work is focused on studying the cosmology of variable modified Chaplygin gas (VMCG) in the framework of exponential and logarithmic <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>f</mi><mo>(</mo><mi>T</mi><mo>)</mo></mrow></semantics></math></inline-formula> theory. The equation of state (EoS) for VMCG in exponential and logarithmic <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>f</mi><mo>(</mo><mi>T</mi><mo>)</mo></mrow></semantics></math></inline-formula> gravity shows quintom behavior. Primordial perturbations were studied for VMCG in both exponential and logarithmic <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>f</mi><mo>(</mo><mi>T</mi><mo>)</mo></mrow></semantics></math></inline-formula> gravity, and it was observed that the potential increases with cosmic time <i>t</i>, and the scalar field decreases toward the minimum value of the potential. The squared speed of sound was positive, meaning that VMCG in both exponential and logarithmic <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>f</mi><mo>(</mo><mi>T</mi><mo>)</mo></mrow></semantics></math></inline-formula> gravity shows stability against small gravitational perturbations.
ISSN:2571-712X

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