Will there be future deceleration? A study of particle creation mechanism in non-equilibrium thermodynamics
Supriya Pan,Subenoy Chakraborty +1 more
TLDR
In this article, a non-equilibrium thermodynamics based on adiabatic particle creation mechanism with the motivation of considering it as an alternative choice to explain the recent observed accelerating phase of the universe.Abstract:
The paper deals with non-equilibrium thermodynamics based on adiabatic particle creation mechanism with the motivation of considering it as an alternative choice to explain the recent observed accelerating phase of the universe. Using Friedmann equations, it is shown that the deceleration parameter ($q$) can be obtained from the knowledge of the particle production rate ($\Gamma$). Motivated from thermodynamical point of view, cosmological solutions are evaluated for the particle creation rates in three cosmic phases, namely, inflation, matter dominated and present late time acceleration. The deceleration parameter ($q$) is expressed as a function of the redshift parameter ($z$), and its variation is presented graphically. Also, statefinder analysis has been presented graphically in three different phases of the universe. Finally, two non-interacting fluids with different particle creation rates are considered as cosmic substratum, and deceleration parameter ($q$) is evaluated. It is examined whether more than one transition of $q$ is possible or not by graphical representations.read more
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Revisiting a Negative Cosmological Constant from Low-Redshift Data
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Challenging bulk viscous unified scenarios with cosmological observations
TL;DR: In this paper, the authors investigated a unified cosmic fluid scenario endowed with bulk viscosity in which the coefficient of the bulk viscous coefficient has a power law evolution, and extracted the observational constraints using the latest cosmological datasets and examined their behavior at the level of both background and perturbations.
Journal ArticleDOI
Revisiting a negative cosmological constant from low-redshift data
TL;DR: In this paper, the authors explore a scenario where the dark energy sector consists of two components: a negative cosmological constant, with a dark energy component with equation of state $w_{\phi}$ on top.
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Is the continuous matter creation cosmology an alternative to $\Lambda$CDM?
TL;DR: In this article, the authors revisited the matter creation cosmology including the evolution of baryons and dark matter particles and showed that the creation process affects only dark matter and not Baryons.
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