A non-minimally coupled potential for inflation and dark energy after Planck 2015: a comprehensive study

Eshaghi, Mehdi; Zarei, Moslem; Riazi, N.; Kiasatpour, Ahmad

doi:10.1088/1475-7516/2015/11/037

Cited by 11 publications

(5 citation statements)

References 99 publications

(225 reference statements)

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“…Scalar fields have been used for a number of cosmological mechanisms such as inflation which can be constrained through CMB observations. Currently Planck data favor a single field slow-roll inflation [9,10]. This is compatible with a number of modified theories of gravity.…”

Section: Introductionmentioning

confidence: 54%

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Some aspects of reconstruction using a scalar field in f(T) gravity

2017

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General relativity characterizes gravity as a geometric property exhibited on spacetime by massive objects, while teleparallel gravity achieves the same results at the level of equations, by taking a torsional perspective of gravity. Similar to the f (R) theory teleparallel gravity can also be generalized to f (T ), with the resulting field equations being inherently distinct from f (R) gravity in that they are second order, while in the former case they turn out to be fourth order. In the present case, a minimally coupled scalar field is investigated in the f (T ) gravity context for several forms of the scalar field potential. A number of new f (T ) solutions are found for these potentials. Their respective state parameters are also being examined.

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Section: Introductionmentioning

confidence: 54%

“…The evolution of the scale factor with cosmic time is shown in Fig. (9) for different values of the parameter λ. For all late-times of this scenario, the same highly accelerated setting follows for latetimes.…”

Section: Higgs Potentialmentioning

confidence: 99%

Some aspects of reconstruction using a scalar field in f(T) gravity

2017

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“…Moreover, the models with large plateaus (Starobinsky or α-attractors) are found to be most favored form the PLANCK observation. While most of these plateau models can be cast into exponential potential, plateau potentials with power-law form have also been discussed in super gravity [27,46] and non-minimal coupling to gravity [47,48]. In this section we will try to construct our model based on this non-minimally coupled scalar-tensor theory.…”

Section: Appendix a Towards Derivation Of V Min From Non-minimal Scal...mentioning

confidence: 99%

Minimal plateau inflationary cosmologies and constraints from reheating

Maity

Saha

2019

Class. Quantum Grav.

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With the growing consensus on simple power law inflation models not being favored by the PLANCK observations, dynamics for the non-standard inflation gain significant interest in the recent past. In this paper, we analyze in detail a class of supergravity inspired phenomenological inflationary models with non-polynomial potential based on [1], and compare the model predictions with the currently most favored Starobinsky and its generalized α-attractor models in the (n s , r) plane constrained by PLANCK. Importantly for a wide range of parameter space, our model provides successful inflation in the sub-Planckian regime.We also have performed model independent analysis of reheating in terms of the effective equation of state parameter. In particular, we consider two stages of reheating dynamics with generalized inflaton equation of state in the initial and relativistic equation of state in the later phase. Finally, we show how our generalized reheating analysis constrains the inflation models under consideration.

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“…Eshagli et al [164] have investigated an inflation model in which the inflaton field has a fractional potential,…”

Section: Inflation With Fractional Potentialmentioning

confidence: 99%

Predictions of Spectral Parameters by Several Inflationary Universe Models in Light of the Planck Results

Grøn

2018

Universe

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I give a review of predictions of values of spectral parameters for a large number of inflationary models. The present review includes detailed deductions and information about the approximations that have been made, written in a style that is suitable for text book authors. The Planck data have the power of falsifying several models of inflation as shown in the present paper. Furthermore, they fix the beginning of the inflationary era to a time about 10 −36 s, and the typical energy of a particle at this point of time to 10 16 GeV, only a few orders of magnitude less than the Planck energy, and at least 12 orders of magnitude larger than the most energetic particle produced by CERN's particle accelerator, LHC. This is a phenomenological review with contents as given in the list below. It includes systematic presentations of the different types of slow roll parameters that have been in use, and also of the N-formalism.

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A non-minimally coupled potential for inflation and dark energy after Planck 2015: a comprehensive study

Cited by 11 publications

References 99 publications

Some aspects of reconstruction using a scalar field in f(T) gravity

Some aspects of reconstruction using a scalar field in f(T) gravity

Minimal plateau inflationary cosmologies and constraints from reheating

Predictions of Spectral Parameters by Several Inflationary Universe Models in Light of the Planck Results

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