10 papers found.

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We study nonlinear cosmological perturbations and their possible non-Gaussian character in an extended nonminimal inflation where gravity is coupled nonminimally to both the scalar field and its derivatives. By expansion of the action up to the third order, we focus on the nonlinearity and non-Gaussianity of perturbations in comparison with recent observational data. By adopting...

( 1994 )
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23. Y. Heydarzade , **F**. **Darabi** , arXiv: 1710 ... . 04485
24. Y. Heydarzade , **F**. **Darabi** , Eur. Phys. J. C (under review)
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26. A. Wang , Y. Wu , Gen. Relativ. Gravity 31 ( 1 ), 107 ( 1999 )
27. J.M. Bardeen , B

( 2006 )
34. L. Amendola , R. Gannouji , D. Polarski , S. Tsujikawa, Phys. Rev. D 75 , 083504 ( 2007 )
35. S. Capozziello , **F**. **Darabi** , D. Vernieri , Mod. Phys. Lett. A 26 , 65 ( 2011 )
36. E.V. Linder ... , Phys. Rev. D 81 , 127301 ( 2010 )
37. E.V. Linder , Phys. Rev. D 82 , 109902 ( 2010 )
38. S.H. Chen , J.B. Dent , S. Dutta , E.N. Saridakis , Phys. Rev. D 83 , 023508 ( 2011 )
39. K. Atazadeh , **F**. **Darabi**

. Space Sci.
298, 519 (2005)
26. A.F. Santos, S.C. Ulhoa, Mod. Phys. Lett. A 30, 1550039 (2015)
27. Y. Heydarzade, **F**. **Darabi**, Phys. Lett. B 771, 365 (2017)
28. Y. Heydarzade, H. Moradpour, **F**. **Darabi**, Can ... . Lett. 118, 021102 (2017)
38. V. Dzhunushaliev, H. Quevedo, Gravit. Cosmol. 23, 280 (2017)
39. Y. Heydarzade, H. Hadi, C. Corda, **F**. **Darabi**, Phys. Lett. B 776,
457 (2018)
40. H. Moradpour, A. Bonilla

A generalized version for the Rastall theory is proposed showing the agreement with the cosmic accelerating expansion. In this regard, a coupling between geometry and the pressureless matter fields is derived which may play the role of dark energy, responsible for the current accelerating expansion phase. Moreover, our study also shows that the radiation field may not be coupled...

We study the inflation in terms of the logarithmic entropy-corrected holographic dark energy (LECHDE) model with future event horizon, particle horizon, and Hubble horizon cut-offs, and we compare the results with those obtained in the study of inflation by the holographic dark energy HDE model. In comparison, the spectrum of primordial scalar power spectrum in the LECHDE model...

We consider the FLRW universe in a loop quantum cosmological model filled with radiation, baryonic matter (with negligible pressure), dark energy, and dark matter. The dark matter sector is supposed to be of Bose–Einstein condensate type. The Bose–Einstein condensation process in a cosmological context by supposing it as an approximate first-order phase transition, has already...

, Phys. Rev.
D 75, 083504 (2007)
36. S. Capozziello, **F**. **Darabi**, D. Vernieri, Mod. Phys. Lett. A 26, 65
(2011)
37. E.V. Linder, Phys. Rev. D 81, 127301 (2010)
38. E.V. Linder, Phys. Rev. D 82, 109902 (2010 ... )
39. S.H. Chen, J.B. Dent, S. Dutta, E.N. Saridakis, Phys. Rev. D 83,
023508 (2011)
40. K. Atazadeh, **F**. **Darabi**, Eur. Phys. J. C 72, 2016 (2012)
41. A. Paliathanasis, S. Basilakos, E.N. Saridakis, S

)
57. C.G. Bohmer, F.S.N. Lobo, Eur. Phys. J. C 70, 1111 (2010). P. Wu
and H. Yu. Phys. Rev. D 81, 103522 (2010)
58. P. Wu, HYu. Phys, Rev. D 81, 103522 (2010)
59. Y. Heydarzade, M. Khodadi, **F**. **Darabi** ... (2012)
63. C. Clarkson, S.S. Seahra, Class. Quant. Grav. 22, 3653 (2005)
64. K. Atazadeh, Y. Heydarzade, **F**. **Darabi**, Phys. Lett. B 732, 223
(2014)
65. Y. Heydarzade, **F**. **Darabi**, JCAP 04, 028 (2015)
66. D.J

We have studied the Hawking radiation from generalized rotating and static (2+1)-dimensional BTZ black holes. In this regard, we have benefited from the quantum tunneling approach with WKB approximation and obtained the tunneling rate of outgoing scalar and spinor particles across the horizons. We have also obtained the Hawking temperature at the horizons corresponding to the...