Redshift Drift in $f(R,T)$ Gravity

Abstract

Redshift drift refers to the phenomena that redshift of cosmic objects is a function of time. Measurement of redshift drift is of fundamental importance in physical cosmology and can be utilized to distinguish different cosmological models. Redshift drift can be expressed in two distinct methods. The first method is related to cosmography, where the Redshift drift is given as a series expansion of cosmological parameters, while the second method is written as a function of Hubble parameter and its time derivatives which ultimately involve field equations of a chosen theory of gravity. By equating corresponding terms from both the series, the model parameter(s) of any modified theory of gravity can be constrained. The present note aims at constraining the model parameter $\zeta$ of $f(R,T)$ gravity theory where $f(R,T)=R+\zeta T$. By equating linear terms in redshift $z$ from both the series, we constrain $\zeta$ in the range $-0.51{\kappa }^2\lesssim \zeta \lesssim -0.47{\kappa }^2$, where ${\kappa }^2=\frac{8\pi G}{c^4}$.

To appear in New Astronomy

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Cited by in corpus (9)

• Slow-roll inflation in f(R,T) gravity and a modified Starobinsky-like inflationary model
• Inflation in $f(R,T)$ Gravity
• Swampland dS conjecture in Mimetic $f(R,T)$ gravity
• Inflationary Cosmology in the Modified $f(R,T)$ Gravity
• Constraining minimally extended varying speed of light by cosmological chronometers
• Inflation in mimetic $f(R,T)$ gravity
• Toward a direct measurement of the cosmic acceleration: the first preparation with FAST
• Growth of matter fluctuations in $f(R,T)$ Gravity
• Well behaved class of Heintzmann's solution within $f(R,T)$ framework