The generalized <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e22" altimg="si5.svg"><mml:mrow><mml:mi>s</mml:mi><mml:mi>l</mml:mi><mml:mrow><mml:mo>(</mml:mo><mml:mn>2</mml:mn><mml:mo>,</mml:mo><mml:mi>R</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e41" altimg="si6.svg"><mml:mrow><mml:mi>s</mml:mi><mml:mi>u</mml:mi><mml:mrow><mml:mo>(</mml:mo><mml:mn>1</mml:mn><mml:mo>,</mml:

Shokri, Mehdi; Sadeghi, J.; Setare, M. R.

doi:10.1016/j.aop.2021.168487

Cited by 13 publications

(3 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By combining the slow-roll parameters (39) and the number of e-folds ( 41), the inflationary parameters ( 29) of the R 2p model are calculated as shown in (A4 -A6).…”

Section: B R 2p Modelmentioning

confidence: 99%

“…Constant-roll approach has opened a new window to analyze cosmic inflation due to a constant rate of rolling for inflaton. One can find a wide range of inflationary models investigated in the context of constant-roll idea [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39], in particular, models coming from f (R) gravity, where new scalar fields are not required to drive inflation and one only takes into account geometric extensions of the Hilbert-Einstein action. In [40], the authors considered two different approaches.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Constant-roll $f(R)$ inflation compared with Cosmic Microwave Background anisotropies and swampland criteria

Shokri¹,

Setare²,

Capozziello³

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

Inflationary models derived from f (R) gravity, where the scalaron rolls down with a constant rate from the top to the minimum of the effective potential, are considered. Specifically, we take into account three f (R) models i.e. Starobinsky R 2 , R 2p and the logarithmic corrected models. We compare the inflationary parameters derived from the models with the observational data of CMB anisotropies i.e. the Planck and Keck/array datasets in order to find observational constraints on the parameters space. We find that although our f (R) constant-roll models for γ = 0 show observationally acceptable values of r, they do not predict favoured values of the spectral index.In particular, we have ns > 1 for the Starobinsky R 2 and R 2p models and 0.996 < ns < 0.999 for logarithmic model. Finally, we study the models from the point of view of Weak Gravity Conjecture adopting the swampland criteria.

show abstract

“…By combining the slow-roll parameters (39) and the number of e-folds ( 41), the inflationary parameters ( 29) of the R 2p model are calculated as shown in (A4 -A6).…”

Section: B R 2p Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Constant-roll $f(R)$ inflation compared with Cosmic Microwave Background anisotropies and swampland criteria

Shokri¹,

Setare²,

Capozziello³

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Constant-roll approach has opened a new window to analyze cosmic inflation due to the consideration of a constant rate of rolling for inflaton. The model is becoming very popular since a wide range of inflationary models has been investigated in the context of constant-roll inflation [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]. In the present manuscript, we study a fermionic inflationary model in which a fermionic field which is non-minimally coupled to gravity is the main responsible to drive inflation instead of inflaton introduced in the standard inflationary paradigm.…”

mentioning

confidence: 99%

Constant-roll inflation from a fermionic field

Shokri¹,

Sadeghi²,

Setare³

2021

Preprint

View full text Add to dashboard Cite

We study the inflationary period driven by a fermionic field which is non-minimally coupled to gravity in the context of the constant-roll approach. We consider the model for a specific form of coupling and perform the corresponding inflationary analysis. By comparing the result with the Planck observations coming from CMB anisotropies, we find the observational constraints on the parameters space of the model and also the predictions the model. We find that the values of r and ns for −1.5 < β ≤ −0.9 are in good agreement with the observations when |ξ| = 0.1 and N = 60.

show abstract