Constraint on cosmological model with matter creation using complementary astronomical observations

Yuan, Qiang; Zhang, Tong-Jie; Yi, Ze-Long

doi:10.1007/s10509-007-9553-1

Cited by 23 publications

(12 citation statements)

References 32 publications

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“…The limit on the parameter β for all kinematics tests are in the range 0.50 ≤ β ≤ 1, i.e., −1 < q ≤ 0, which is acceptable range observed by SNe Ia data (Qiang et al 2007). The kinematics tests for the inflationary phase may be derived in a similar way as discussed above.…”

Section: Proper Distance-redshiftmentioning

confidence: 56%

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Early universe cosmology with particle creation: kinematics tests

Singh

Беешам

2011

Astrophys Space Sci

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We study some properties of the early evolution of the universe with particle creation in the framework of the flat Friedmann-Robertson-Walker line element. The field equations are solved by using "gamma-law" equation of state p = (γ − 1)ρ, where the parameter γ varies with cosmological time. A unified description of the early evolution of the universe is presented in which an inflationary phase is followed by a radiation-dominated phase. Exact expressions for the lookback time, proper distance, luminosity distance and angular diameter distance versus redshift are derived and their meaning discussed in detail. It is found that the negative pressure due to the particle creation may play the role of an accelerating universe.

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Section: Proper Distance-redshiftmentioning

confidence: 56%

“…Zimdahl et al (2001) tested the particle creation with SNe Ia data and got the result of accelerating universe. Recently, Qiang et al (2007) have studied the universe with adiabatic particle creation and showed that the model is consistent with SNe Ia data.…”

mentioning

confidence: 76%

Early universe cosmology with particle creation: kinematics tests

Singh

Беешам

2011

Astrophys Space Sci

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“…Zimdahl et al 11 tested the particle creation with SNe Ia data and got the result of the accelerating universe. Yuan Qiang et al 12 studied the models with adiabatic particle creation and showed that the model is consistent with SNe Ia data. On a phenomenological level particle creation has been described in the literature in terms of a bulk viscous stress.…”

Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 86%

Viscous FRW Models With Particle Creation in Early Universe

Singh

2012

Mod. Phys. Lett. A

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We discuss the dynamical effects of bulk viscosity and particle creation on the early evolution of the Friedmann -Robertson -Walker model in the framework of open thermodynamical systems. We consider bulk viscosity and particle creation as separate irreversible processes. Exact solutions of the Einstein field equations are obtained by using the "gammalaw" equation of state p = (γ − 1)ρ, where the adiabatic parameter γ varies with scale factor of the metric. We consider the cosmological model to study the early phases of the evolution of the universe as it goes from an inflationary phase to a radiation -dominated era in the presence of bulk viscosity and particle creation. Analytical solutions are obtained for particle number density and entropy for all models. It is found that, by choosing appropriate functions for particle creation rate and bulk viscous coefficient, the models exhibit singular and non-singular beginnings.

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“…Recently a lot of cosmologists and astrophysicists are there addressed the FRW models with particle creation problem [48][49][50]. Zimdahl, Yuan Qiang, and their colleague [51,52] studied the models of particle creation with SN 1a data and showed the result is consistent and the universe is in an accelerating phase. At the moment, [53] is exploring a different type of matter formation.…”

Section: Introductionmentioning

confidence: 99%

Role of a periodic varying deceleration parameter in Particle creation with higher dimensional FLRW Universe

Garg,

Pradhan

2021

Preprint

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The present search focus on the mechanism of gravitationally influenced particle creation (PC) in higher dimensional Friedmann-Lemaitre-Robertson-Walker(FLRW) cosmological models with cosmological constant (CC). The solution of the corresponding field equations is obtained by assuming a periodically varying deceleration parameter (PVDP) i.e. q = m cos kt − 1 [Shen and Zhao, Chin. Phys. Lett., 31 (2014) 010401] which gives a scale factor a(t) = a0 tan kt 2 1 m , where a0 is the scale factor at the current epoch. Here k displays the PVDP periodicity and can be regarded as a parameter of cosmic frequency, m is an enhancement element that increases the PVDP peak. Here, we investigated periodic variation behavior of few quantities such as the deceleration parameter q, the energy density ρ, PC rate ψ, the entropy S, the CC Λ, Newton's gravitational constant G and discuss their physical significance. We have also explored the density parameter, proper distance, angular distance, luminosity distance, apparent magnitude, age of the universe, and the look-back time with redshift z and have observed the role of particle formation in-universe evolution in early and late times. The periodic nature of various physical parameters is also discussed which are supporting the recent observations.

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Constraint on cosmological model with matter creation using complementary astronomical observations

Cited by 23 publications

References 32 publications

Early universe cosmology with particle creation: kinematics tests

Early universe cosmology with particle creation: kinematics tests

Viscous FRW Models With Particle Creation in Early Universe

Role of a periodic varying deceleration parameter in Particle creation with higher dimensional FLRW Universe

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