Dynamics of modified Chaplygin gas inflation on the Brane with bulk viscous pressure

Jawad, Abdul; Ilyas, Amara; Rani, Shamaila

doi:10.1142/s0218271817500316

Cited by 20 publications

(11 citation statements)

References 40 publications

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“…Moreover, many authors have investigated the warm inflation in various alternative as well as modified theories of gravity [37][38][39][40][41][42][43][44][45][46][47][48][49]. Recently, a new family of inflation models is being developed named shaft inflation [50].…”

Section: Introductionmentioning

confidence: 99%

Warm modified Chaplygin gas shaft inflation

2017

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In this paper, we examine the possible realization of a new inflation family called "shaft inflation" by assuming the modified Chaplygin gas model and a tachyon scalar field. We also consider the special form of the dissipative coefficientφ 2 and calculate the various inflationary parameters in the scenario of strong and weak dissipative regimes. In order to examine the behavior of inflationary parameters, the n s -φ, n s -r , and n s -α s planes (where n s , α s , r , and φ represent the spectral index, its running, tensor-to-scalar ratio, and scalar field, respectively) are being developed, which lead to the constraints r < 0.11, n s = 0.96 ± 0.025, and α s = −0.019 ± 0.025. It is quite interesting that these results of the inflationary parameters are compatible with BICEP2, WMAP (7 + 9) and recent Planck data.

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Section: Introductionmentioning

confidence: 99%

Warm modified Chaplygin gas shaft inflation

2017

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“…More recently, in Ref. [26], the dynamics of warm inflation in a modified Chaplygin gas (MCG) was studied.…”

Section: Introductionmentioning

confidence: 99%

“…Panotopoulos and Videla [26] discussed the warm inflation by assuming the quartic potential and an inflaton decay rate proportional to temperature and found that their results are in agreement with the latest Planck data, obtaining a lower value for the tensor-to-scalar ratio compared to the cold inflation scenario. Going further, several authors have investigated the warm inflation scenario in various alternative/modified theories of gravity [27,28]. Moreover, a new family of inflation models is being developed named as shaft inflation [29].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of polynomial Chaplygin gas warm inflation

Jawad

Chaudhary²,

Videla

2017

Eur. Phys. J. C

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In the present work, we study the consequences of a recently proposed polynomial inflationary potential in the context of the generalized, modified, and generalized cosmic Chaplygin gas models. In addition, we consider dissipative effects by coupling the inflation field to radiation, i.e., the inflationary dynamics is studied in the warm inflation scenario. We take into account a general parametrization of the dissipative coefficient for describing the decay of the inflaton field into radiation. By studying the background and perturbative dynamics in the weak and strong dissipative regimes of warm inflation separately for the positive and negative quadratic and quartic potentials, we obtain expressions for the most relevant inflationary observables as the scalar power spectrum, the scalar spectral, and the tensor-to-scalar ratio. We construct the trajectories in the n s -r plane for several expressions of the dissipative coefficient and compare with the two-dimensional marginalized contours for (n s , r ) from the latest Planck data. We find that our results are in agreement with WMAP9 and Planck 2015 data.

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“…Various authors have examined warm inflation by considering the Chaplygin gas, standard and tachyon scalar field models in Einstein's General Relativity as well as in braneworld scenario with different expressions for the dissipative coefficient [62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77]. They found the consistency of their results with observational data, i.e., BICEP2, WMAP (7 + 9) and Planck data.…”

Section: Introductionmentioning

confidence: 99%

Impact of generalized dissipative coefficient on warm inflationary dynamics in the light of latest Planck data

Jawad

Hussain²,

Rani

et al. 2017

Eur. Phys. J. C

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The warm inflation scenario in view of the modified Chaplygin gas is studied. We consider the inflationary expansion to be driven by a standard scalar field whose decay ratio has a generic power-law dependence with the scalar field φ and the temperature of the thermal bath T . By assuming an exponential power-law dependence in the cosmic time for the scale factor a(t), corresponding to the intermediate inflation model, we solve the background and perturbative dynamics considering our model to evolve according to (1) weak dissipative regime and (2) strong dissipative regime. Specifically, we find explicit expressions for the dissipative coefficient, scalar potential, and the relevant inflationary observables like the scalar power spectrum, scalar spectral index, and tensor-to-scalar ratio. The free parameters characterizing our model are constrained by considering the essential condition for warm inflation, the conditions for the model evolves according to weak or strong dissipative regime, and the 2015 Planck results through the n s -r plane.

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Dynamics of modified Chaplygin gas inflation on the Brane with bulk viscous pressure

Cited by 20 publications

References 40 publications

Warm modified Chaplygin gas shaft inflation

Warm modified Chaplygin gas shaft inflation

Dynamics of polynomial Chaplygin gas warm inflation

Impact of generalized dissipative coefficient on warm inflationary dynamics in the light of latest Planck data

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