Accelerated expansion of the universe from the perspective of inhomogeneous cosmology

Bormotova, Irina; Kopteva, Elena; Churilova, Mariia; Stuchlík, Zdeněk

doi:10.1142/s0217751x20400370

Cited by 3 publications

(5 citation statements)

References 9 publications

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“…Thus ( 38) is consistent with the observational value for the late time (t → ∞) acceleration of the universe. The interesting aspect is that this has been derived by developing a k-essence model for inhomogeneous cosmology [26,27,28,29,30,31,32]. This result is very encouraging as all other relevant k-essence model for late time acceleration of the universe were basically based on FLRW metric for homogeneous cosmology.…”

Section: Flrw Metricmentioning

confidence: 91%

“…This also satisfies dark energy pressure condition which is negative i.e., negative pressure generates late time cosmic acceleration [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50].…”

Section: Equation Of State Parameter ωmentioning

confidence: 92%

“…Inhomogeneous cosmological models [1,2,3,24,25,26,27,28,29,30] are those exact solutions of Einstein's equations that contain at least a subclass of non-vacuum, non-static FLRW solutions as a limit. Inhomogeneous models of the universe arise from perturbations of the FLRW metric.…”

Section: Introductionmentioning

confidence: 99%

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An accelerated universe with negative equation of state parameter in inhomogeneous cosmology with k-essence scalar field

Gangopadhyay¹,

Mukherjee

2021

Physics of the Dark Universe

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We obtain a scaling relation for spherically symmetric k-essence scalar fields φ(r, t) for an inhomogeneous cosmology with the Lemaitre-Tolman-Bondi (LTB) metric. We show that this scaling relation reduces to the known relation for a homogeneous cosmology when the LTB metric reduces to the Friedmann-Lemaitre-Robertson-Walker (FLRW) metric under certain identifications of the metric functions. A k-essence lagrangian is set up and the Euler-Lagrangian equations solved assuming φ(r, t) = φ 1 (r)+φ 2 (t). The solutions enable the LBT metric functions to be related to the fields. The LTB inhomogeneous universe exhibits accelerated expansion i.e.cosmic acceleration driven by negative pressure.

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Section: Flrw Metricmentioning

confidence: 91%

Section: Equation Of State Parameter ωmentioning

confidence: 92%

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An accelerated universe with negative equation of state parameter in inhomogeneous cosmology with k-essence scalar field

Gangopadhyay¹,

Mukherjee

2021

Physics of the Dark Universe

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“…The Stephani solution [2] is among them. It allows building of the model of the universe with accelerated expansion within general relativity with no modifications or suggestions of the exotic types of matter [3][4][5][6][7][8]. This is a non-static solution for expanding perfect fluid with zero shear and rotation, which contains the known Friedmann solution as a particular case.…”

Section: Introductionmentioning

confidence: 99%

Geodesic Structure of the Accelerated Stephani Universe

2021

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For the spherically symmetric Stephani cosmological model with an accelerated expansion, we investigate the main scenarios of the test particle and photon motion. We show that a comoving observer sees an appropriate picture. In the case of purely radial motion, the radial velocity decreases slightly with time due to the universe expansion. Both particles and photons spiral out of the center when the radial coordinate is constant. In the case of the motion with arbitrary initial velocity, the observable radial distance to the test particle can increase under negative observable radial velocity.

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“…Periodically the attempts arise to involve the Stephani solution in solving the problem of the cosmological acceleration within general relativity with no modifications or suggesting the exotic types of matter [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Geodesic Structure of the Accelerated Stephani Universe

Bormotova,

Kopteva,

Stuchlik

2021

Preprint

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For the Stephani cosmological model with accelerated expansion we investigate the main scenarios of the test particle motion. We show that within the area of the observable universe the singularities of the model do not influence the test particles motion. In accordance with the universe geometry, the observable velocities decrease by the cosmological expansion and the trajectories are represented by hyperbolas changing their curvatures with time.

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Accelerated expansion of the universe from the perspective of inhomogeneous cosmology

Cited by 3 publications

References 9 publications

An accelerated universe with negative equation of state parameter in inhomogeneous cosmology with k-essence scalar field

An accelerated universe with negative equation of state parameter in inhomogeneous cosmology with k-essence scalar field

Geodesic Structure of the Accelerated Stephani Universe

Geodesic Structure of the Accelerated Stephani Universe

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