“Hassan Firouzjahi”

Tel:  021-2310-5057
Fax:  +98 21 22827309
Email: 

IPM Positions

Professor, School of Astronomy
(2012 - Present )

Past IPM Positions

Head, School of Astronomy
(2017 - 2023)
Faculty Member , School of Physics
(2008 - 2012)


Research Interests

Early Universe Cosmology, Inflation, Cosmological Perturbation Theory, High Energy Physics

Related Papers

1. K. Asadi, A. Nassiri-Rad and H. Firouzjahi
Stochastic multiple fields inflation: Diffusion dominated regime
Phys. Rev. D 108 (2023),   [abstract]
Code: IPM/A-2023/31
2. H. Firouzjahi and A. Riotto
Sign of non-Gaussianity and the primordial black holes abundance
Phys. Rev. D 108 (2023),   [abstract]
Code: IPM/A-2023/30
3. A. Talebian, Seyed A. Hosseini Mansoori and H. Firouzjahi
Inflation from Multiple Pseudo-scalar Fields: Primordial Black Hole Dark Matter and Gravitational Waves
Astrophysical Journal 948 (2023),   [abstract]
Code: IPM/A-2023/24
4. H. Firouzjahi
One-loop corrections in power spectrum in single field inflation
JCAP 2023 (2023),   [abstract]
Code: IPM/A-2023/14
5. H. Firouzjahi
Loop corrections in gravitational wave spectrum in single field inflation
Phys. Rev. D 108 (2023),   [abstract]
Code: IPM/A-2023/13
6. H. Firouzjahi and A. Talebian
Induced gravitational waves from ultra slow-roll inflation and pulsar timing arrays observations
JCAP 2023 (2023),   [abstract]
Code: IPM/A-2023/12
7. H. Firouzjahi and H. Sheikhahmadi
Vacuum Zero Point Energy and its Statistical Correlations in dS Background
Phys. Rev. D 108 (2023),   [abstract]
Code: IPM/A-2023/05
8. A. Talebian, A. Nassiri-Rad and H. Firouzjahi
Primordial Helical Magnetic Fields from Inflation?
Phys. Rev. D 105 (2022),   [abstract]
Code: IPM/A-2021/35
9. Seyed A. Hosseini Mansoori, A. Talebian, Z. Molaee and H. Firouzjahi
Multifield mimetic gravity
Phys. Rev. D 105 (2022),   [abstract]
Code: IPM/A-2021/36
10. H. Firouzjahi and A. Talebian
White Hole Cosmology and Hawking Radiation from Quantum Cosmological Perturbation
Phys. Rev. D 106 (2022),   [abstract]
Code: IPM/A-2022/29
11. H. Moshafi, H. Firouzjahi and A. Talebian
Multiple transitions in vacuum dark energy and H0 tension
Astrophysical Journal 920 (2022),   [abstract]
Code: IPM/A-2022/28
12. H. Firouzjahi
Cosmological constant problem on the horizon
Phys. Rev. D 106 (2022),   [abstract]
Code: IPM/A-2022/27
13. A. Nassiri-Rad, K. Asadi and H. Firouzjahi
Inflation with Stochastic Boundary
Phys. Rev. D 106 (2022),   [abstract]
Code: IPM/A-2022/26
14. H. Firouzjahi
Cosmological constant and vacuum zero point energy in black hole backgrounds
Phys. Rev. D 106 (2022),   [abstract]
Code: IPM/A-2022/14
15. S. Hooshangi, A. Talebian, M H. Namjoo and H. Firouzjahi
Multiple field ultraslow-roll inflation: Primordial black holes from straight bulk and distorted boundary
Phys. Rev. D 105 (2022),   [abstract]
Code: IPM/A-2022/13
16. H. Firouzjahi, M A. Gorji, Sh. Mukohyama and A. Talebian
Dark matter from entropy perturbations in curved field spac
Phys. Rev. D 105 (2022),   [abstract]
Code: IPM/A-2021/43
17. H. Firouzjahi, M A. Gorji, Sh. Mukohyama and B. Salehian
Dark photon dark matter from charged inflaton
Journal of High Energy Physics (JHEP) (2021),   [abstract]
Code: IPM/A-2021/13
18. B. Salehian, M A. Gorji, H. Firouzjahi and Sh. Mukohyama
Vector dark matter production from inflation with symmetry breaking
Phys. Rev. D 103 (2021),   [abstract]
Code: IPM/A-2021/09
19. Seyed A. Hosseini Mansoori, A. Talebian and H. Firouzjahi
Mimetic Inflation
Journal of High Energy Physics (JHEP) (2021),   [abstract]
Code: IPM/A-2020/38
20. M A. Gorji, Seyed A. Hosseini Mansoori and H. Firouzjahi
Inflation with multiple vector fields and non-Gaussianities
JCAP 2020 (2020),   [abstract]
Code: IPM/A-2020/41
21. A. Talebian, A. Nassiri-Rad and H. Firouzjahi
Revisiting magnetogenesis during inflation
Phys. Rev. D 102 (2020),   [abstract]
Code: IPM/A-2020/40
22. H. Firouzjahi, A. Nassiri-Rad and M. Noorbala
Stochastic nonattractor inflation
Phys. Rev. D 102 (2020),   [abstract]
Code: IPM/A-2020/33
23. H. Firouzjahi, A. Karami and T . Rostami
Vacuum decay in the presence of a cosmic string
Phys. Rev. D 101 (2020),   [abstract]
Code: IPM/A-2020/12
24. M A . Gorji, A. Allahyari, M. Khodadi and H. Firouzjahi
Mimetic black holes
Phys. Rev. D 101 (2020),   [abstract]
Code: IPM/A-2020/08
25. A. Talebian, A. Nassiri-Rad and H. Firouzjahi
Stochastic effects in anisotropic inflation
Phys. Rev. D 101 (2020),   [abstract]
Code: IPM/A-2019/35
26. A. Allahyari, H. Firouzjahi and B. Mashhoon
Quasinormal modes of generalized black holes: δ-Kerr spacetime
Classical Quant. Grav. 37 (2020),   [abstract]
Code: IPM/A-2019/27
27. H. Firouzjahi and B. Mashhoon
Twisted gravitational waves in the presence of a cosmological constant
Phys. Rev. D 100 (2019),   [abstract]
Code: IPM/A-2019/29
28. M. Noorbala and H. Firouzjahi
Boundary crossing in stochastic inflation with a critical number of fields
Phys. Rev. D 100 (2019),   [abstract]
Code: IPM/A-2019/28
29. H. Firouzjahi, M A. Gorji, Seyed A. Hosseini Mansoori, A. Karami and T. Rostami
Charged Vector Inflation
Phys. Rev. D 100 (2019),   [abstract]
Code: IPM/A-2019/18
30. M A. Gorji, Sh. Mukohyama and H. Firouzjahi
Cosmology in mimetic SU(2) gauge theory
JCAP 2019 (2019),   [abstract]
Code: IPM/A-2019/08
31. S. Shakeri, M A. Gorji and H. Firouzjahi
Schwinger Mechanism During Inflation
Phys. Rev. D 99 (2019),   [abstract]
Code: IPM/A-2019/04
32. B. Salehian and H. Firouzjahi
Vacuum decay and bubble nucleation in f(R) gravity
Phys. Rev. D 99 (2019),   [abstract]
Code: IPM/A-2018/25
33. H. Firouzjahi, A. Nassiri-Rad and M. Noorbala
Stochastic Ultra Slow Roll Inflation
JCAP 2019 (2019),   [abstract]
Code: IPM/A-2018/24
34. A. Allahyari, H. Firouzjahi and B. Mashhoon
Quasinormal Modes of a Black Hole with Quadrupole Moment
Phys. Rev. D 99 (2019),   [abstract]
Code: IPM/A-2018/23
35. A A. Abolhasani, H. Firouzjahi, A. Naruko and M. Sasaki
Basic formulation of δN formalism
world scientific (2019), 184  [abstract]
Code: IPM/A-2018/22
36. M. Noorbala, V. Vennin, H. Assadullahi, H. Firouzjahi and D. Wands
Tunneling in stochastic inflation
JCAP 2018 (2018),   [abstract]
Code: IPM/A-2018/27
37. H. Firouzjahi, M A. Gorji, Seyed A. Hosseini Mansoori, A. Karami and T. Rostami
Two-field disformal transformation and mimetic cosmology
JCAP 2018 (2018),   [abstract]
Code: IPM/A-2018/26
38. M A. Gorji, Sh. Mukohyama, H. Firouzjahi and Seyed A. Hosseini Mansoori
Gauge field mimetic cosmology
JCAP 2018 (2018),   [abstract]
Code: IPM/A-2018/07
39. M. Zarei, H. Firouzjahi and Sh. Mukohyama
Vector disformal transformation of cosmological perturbations
Phys. Rev. D 97 (2018),   [abstract]
Code: IPM/A-2017/36
40. M A. Gorji, Seyed A. Hosseini Mansoori and H. Firouzjahi
Higher Derivative Mimetic Gravity
JCAP 2018 (2018),   [abstract]
Code: IPM/A-2017/35
41. H. Firouzjahi, S. Jazayeri, A. Karami and T. Rostami
Bubble nucleation and inflationary perturbations
JCAP 2017 (2017),   [abstract]
Code: IPM/A-2017/34
42. S. Jazayeri, A. Vafaei Sadr and H. Firouzjahi
Primordial anisotropies from cosmic strings during inflation
Phys. Rev. D 96 (2017),   [abstract]
Code: IPM/A-2017/27
43. H. Firouzjahi, M A. Gorji and A. Hosseini Mansoori
Instabilities in Mimetic Matter Perturbations
JCAP (Submitted) [abstract]
Code: IPM/A-2017/07
44. S. Jazayeri, A. Vafaei Sadr and H. Firouzjahi
Primordial anisotropies from cosmic strings during inflation
Phys. Rev. D (Submitted) [abstract]
Code: IPM/A-2017/06
45. T. Rostami, A. Karami and H. Firouzjahi
Effective field theory of statistical anisotropies for primordial bispectrum and gravitational waves
JCAP 2017 (2017), 31  [abstract]
Code: IPM/A-2017/46
46. V. Vennin, H. Assadullahi, H. Firouzjahi, M. Noorbala and D. Wands
Critical Number of Fields in Stochastic Inflation
Phys. Rev. Lett. (2017),   [abstract]
Code: IPM/A-2016/12
47. H. Firouzjahi
Primordial Universe Inside the Black Hole and Inflation
arXiv (2016), 23  [abstract]
Code: IPM/A-2016/27
48. H. Assadullahi, H. Firouzjahi, M. Noorbala, V. Vennin and D. Wands
Multiple Fields in Stochastic Inflation
JCAP (2016),   [abstract]
Code: IPM/A-2016/13
49. H. Firouzjahi, A. Karami and T. Rostami
Primordial inhomogeneities from massive defects during inflation
JCAP (2016),   [abstract]
Code: IPM/A-2016/11
50. A A. Abolhasani, M. Akhshik, R. Emami and H. Firouzjahi
Primordial Statistical Anisotropies: The Effective Field Theory Approach
JCAP (2016),   [abstract]
Code: IPM/A-2015/22
51. f. Hassani, Sh. Baghram and H. Firouzjahi
Lensing as a Probe of Early Universe: from CMB to Galaxies
JCAP 2016 (2016),   [abstract]
Code: IPM/A-2015/21
52. R. Emami and H. Firouzjahi
Clustering Fossil from Primordial Gravitational Waves in Anisotropic Inflation
JCAP (2015),   [abstract]
Code: IPM/A-2015/25
53. S. Aiola, B. Wang, A. Kosowsky, T. Kahniashvili and H. Firouzjahi
Microwave Background Correlations from Dipole Anisotropy Modulation
Phys. Rev. D (2015),   [abstract]
Code: IPM/A-2015/24
54. M. Akhshik, H. Firouzjahi and S. Jazayeri
Cosmological Perturbations and the Weinberg Theorem
JCAP 2015 (2015),   [abstract]
Code: IPM/A-2015/23
55. M. Akhshik, H. Firouzjahi and S. Jazayeri
Effective Field Theory of non-Attractor Inflation
JCAP (2015),   [abstract]
Code: IPM/A-2015/09
56. H. Assadullahi, H. Firouzjahi, M.H. Namjoo and D. Wands
CMB hemispherical asymmetry from non-linear isocurvature perturbations
JCAP 2015 (2015), 15  [abstract]
Code: IPM/A-2015/08
57. M.H. Namjoo, A.A. Abolhasani, H. Assadullahi, S. Baghram, H. Firouzjahi and D. Wands
Expected dipole asymmetry in CMB polarization
JCAP 2015 (2015), 10  [abstract]
Code: IPM/A-2015/07
58. X. Chen, R. Emami, H. Firouzjahi and Yi. Wang
CMB statistical anisotropies of classical and quantum origins
JCAP 2015 (2015), 16  [abstract]
Code: IPM/A-2014/12
59. sh. Baghram, A A. Abolhasani, H. Firouzjahi and M H. Namjoo
Fingerprints of Anomalous Primordial Universe on the Abundance of Large Scale Structures
JCAP (2014),   [abstract]
Code: IPM/A-2014/63
60. A. Abolhasani, S. Baghram, H. Firouzjahi and M.H. Namjoo
Asymmetric Sky from the Long Mode Modulations
Phys. Rev. D 89 (2014), 16  [abstract]
Code: IPM/A-2014/23
61. A. Abolhasani, R. Emami and H. Firouzjahi
Primordial Anisotropies in Gauged Hybrid Inflation
JCAP 2014 (2014), 21  [abstract]
Code: IPM/A-2014/20
62. R. Emami, H. Firouzjahi and M. Zarei
Anisotropic Inflation with the non-Vacuum Initial State
Phys. Rev. D (2014),   [abstract]
Code: IPM/A-2014/19
63. H. Firouzjahi and M.H. Namjoo
Jump in fluid properties of inflationary universe to reconcile scalar and tensor spectra
Phys. Rev. D 90 (2014), 12  [abstract]
Code: IPM/A-2014/18
64. X. Chen, R. Emami, H. Firouzjahi and Y. Wang
The TT, TB, EB and BB correlations in anisotropic inflation
JCAP (2014), 27  [abstract]
Code: IPM/A-2014/17
65. R. Emami, H. Firouzjahi and Y. Wang
Scalar-Tensor Anti-Cross-Correlation does not Help to Reconcile the Tension between BICEP2 and Planck
Phys. Rev. D (2014),   [abstract]
Code: IPM/A-2014/16
66. M. Akhshik, R. Emami, H. Firouzjahi and Y. Wang
Statistical Anisotropies in Gravitational Waves in Solid Inflation
JCAP (Accepted) [abstract]
Code: IPM/A-2014/15
67. M.H. Namjoo, A. Abolhasani, S. Baghram and H. Firouzjahi
CMB Hemispherical Asymmetry: Long Mode Modulation and non-Gaussianity
JCAP 2014 (2014), 11  [abstract]
Code: IPM/A-2014/14
68. S. Jazayeri, Y. Akrami, H. Firouzjahi, A. R. Solomon and Y. Wang
Inflationary power asymmetry from primordial domain walls
JCAP 2014 (2014), 22  [abstract]
Code: IPM/A-2014/11
69. H. Firouzjahi, J. - Ouk Gong and M.h. Namjoo
Scale-dependent hemispherical asymmetry from general initial state during inflation
JCAP 2014 (2014), 16  [abstract]
Code: IPM/A-2014/10
70. H.R. Afshar, H. Firouzjahi and S. Parvizi
dS solutions with co-dimension 2 branes in six dimensions
Class.Quant.Grav (2013),   [abstract]
Code: IPM/A-2014/25
71. M. Alishahiha, H. Firouzjahi, K. Koyama and M.H. Namjoo
Cosmological perturbations in inflationary models with anisotropic space-time scaling in a Lifshitz background
Phys. Rev. D (2013),   [abstract]
Code: IPM/A-2014/24
72. X. Chen, H. Firouzjahi, Eiichiro. Komatsu, M.H. Namjoo and M. Sasaki
In-in and δN calculations of the bispectrum from non-attractor single-field inflation
JCAP (2013),   [abstract]
Code: IPM/A-2014/22
73. A. Abolhasani, R. Emami, J. T. Firouzjaee and H. Firouzjahi
δN formalism in anisotropic inflation and large anisotropic bispectrum and trispectrum
JCAP (2013),   [abstract]
Code: IPM/A-2013/34
74. M.H. Namjoo, S. Baghram and H. Firouzjahi
Hemispherical Asymmetry and Local non-Gaussianity: a Consistency Condition
Phys. Rev. D (2013), 13  [abstract]
Code:
75. S. Baghram, M.H. Namjoo and H. Firouzjahi
Large Scale Anisotropic Bias from Primordial Non-Gaussianity A-2013/23
JCAP 2013 (2013),   [abstract]
Code: IPM/A-2013/23
76. C. Xingang, H. Firouzjahi, M.H. Namjoo and M. Sasaki
A single field inflation model with large local non-Gaussianity
Europhys. Lett. 102 (2013),   [abstract]
Code: IPM/A-2012/21
77. X. Chen, H. Firouzjahi, M.H. Namjoo and . Sasaki
Fluid Inflation
JCAP (2013), 13  [abstract]
Code: IPM/A-2013/25
78. H. Assadullahi, H. Firouzjahi, M H. Namjoo and D. Wands
Modulated curvaton decay
JCAP (2013), 041  [abstract]
Code: IPM/A-2012/24
79. R. Emami and H. Firouzjahi
Curvature Perturbations in Anisotropic Inflation with Symmetry Breaking
JCAP (2013),   [abstract]
Code: IPM/A-2012/017
80. M H. Namjoo, M. Sasaki and H. Firouzjahi
Violation of non-Gaussianity consistency relation in a single field inflationary model
Europhys. Lett. 101 (2013), 39001  [abstract]
Code: IPM/A-2012/015
81. H. Firouzjahi, A. Green, K. Malik and M. Zarei
The Effect of Curvaton Decay on the Primordial Power Spectrum
Phys. Rev. D (2012),   [abstract]
Code: IPM/A-2012/014
82. H. Assadullahi, H. Firouzjahi, M. Namjoo and D. Wands
Curvaton and the inhomogeneous end of inflation
JCAP (2012), 024  [abstract]
Code: IPM/A-2012/012
83. M. Namjoo, H. Firouzjahi and M. Sasaki
Multiple Inflationary Stages with Varying Equation of State
JCAP (2012), 018  [abstract]
Code: IPM/A-2012/012
84. A. Abolhasai, H. Firouzjahi and M. Noorbala
Effects of Variable Newton Constant During Inflation
Phys. Rev. D 86 (2012),   [abstract]
Code: IPM/A-2012/010
85. A. A. Abolhasani, H. Firouzjahi, Sh. Khosravi and M. Sasaki
Local Features with Large Spike non-Gaussianities during Inflation
JCAP 11 (2012), 012  [abstract]
Code: IPM/P-2012/011
86. R. Emami and H. Firouzjahi
Issues on Primordial Anisotropies Generated at the End of Inflation
 (Preprint) [abstract]
arXive.org link: arXiv:1111.1919 [ abs, src, ps, others], cited by
Code: IPM/P-2011/049
87. A. A. Abolhasani, H. Firouzjahi and M. Sasaki
Curvature Perturbation and Waterfall Dynamics in Hybrid Inflation
JCAP 10 (2011), 015  [abstract]
arXive.org link: 1106.6315 [ abs, src, ps, others], cited by
Code: IPM/P-2011/003
88. M. Alishahiha, H. Firouzjahi and M.H. Namjoo
DBI Lifshitz Inflation
JCAP 08 (2011), 028  [abstract]
arXive.org link: 1103.2919 [ abs, src, ps, others], cited by
Code: IPM/P-2011/006
89. H. Firouzjahi and S. Khoeini-Moghaddam
Fields Annihilation and Particles Creation in DBI Inflation
JCAP 1102 (2011), 012  [abstract]
arXive.org link: arXiv:1011.4500 [ abs, src, ps, others], cited by
Code: IPM/P-2010/047
90. A.A. Abolhasani, H. Firouzjahi and M.H. Namjoo
Curvature Perturbations and non-Gaussianities from Waterfall Phase Transition during Inflation
Classical Quant. Grav. 28 (2011), 075009   [abstract]
arXive.org link: arXiv:1010.6292 [ abs, src, ps, others], cited by
Code: IPM/P-2010/044
91. R. Emami, H. Firouzjahi, S.M.S. Movahed and M. Zarei
Anisotropic Inflation from Charged Scalar Fields
JCAP 1102 (2011), 005   [abstract]
arXive.org link: arXiv:1010.5495 [ abs, src, ps, others], cited by
Code: IPM/P-2010/043
92. A.A. Abolhasani and H. Firouzjahi
No Large Scale Curvature Perturbations during Waterfall of Hybrid Inflation
Phys. Rev. D 83 (2011), 063513   [abstract]
arXive.org link: arXiv:1005.2934 [ abs, src, ps, others], cited by
Code: IPM/P-2010/018
93. F. Firouzjahi, S. Khoeini-Moghaddam and S. Khosravi
Cosmic Strings Collision in Cosmological Backgrounds
Phys. Rev. D 81 (2010), 123506  [abstract]
arXive.org link: arXiv:1004.0068 [ abs, src, ps, others], cited by
Code: IPM/P-2010/019
94. D . Battefeld, T. Battefeld, H. Firouzjahi and N. Khosravi
Brane Annihilations during Inflation
JCAP 07 (2010), 009  [abstract]
arXive.org link: arXiv:1004.1417 [ abs, src, ps, others], cited by
Code: IPM/P-2010/013
95. A.A. Abolhasani, H. Firouzjahi and M.M. Sheikh-Jabbari
Tachyonic Resonance Preheating in Expanding Universe
Phys. Rev. D 81 (2010), 043524  [abstract]
Code: IPM/P-2009/052
96. A. Ashoorioon,, H. Firouzjahi and M.M. Sheikh-Jabbari
Matrix Inflation and the Landscape of its Potential
JCAP 05 (2010), 002  [abstract]
arXive.org link: arXiv:0911.4284 [ abs, src, ps, others], cited by
Code: IPM/P-2009/049
97. R. Emami, H. Firouzjahi and M. Sadegh Movahed
Inflation from Charged Scalar and Primordial Magnetic Fields?
Phys. Rev. D 81 (2010), 083526  [abstract]
arXive.org link: arXiv:0908.4161 [ abs, src, ps, others], cited by
Code: IPM/P-2009/044
98. H. Firouzjahi, J. Karouby, S. Khosravi and R. Brandenberger
Zipping and Unzipping of Cosmic String Loops in Collision
Phys. Rev. D 80 (2009), 083508  [abstract]
arXive.org link: arXiv:0907.4986 [ abs, src, ps, others], cited by
Code: IPM/P-2009/043
99. A. Ashoorioon , H. Firouzjahi and M.M. Sheikh-Jabbari
M-Flation: Inflation From Matrix Valued Scalar Fields
JCAP 06 (2009), 018  [abstract]
arXive.org link: arXiv:0903.1481 [ abs, src, ps, others], cited by
Code: IPM/P-2009/009
100. R. Brandenberger, H . Firouzjahi, J. Karouby and S. Khosravi
Gravitational Radiation by Cosmic Strings in a Junction
JCAP 01 (2009), 008  [abstract]
arXive.org link: arXiv:0810.4521 [ abs, src, ps, others], cited by
Code: IPM/P-2008/060
101. F . Chen and H. Firouzjahi
Dynamics of D3-D7 Brane Inflation in Throats
JHEP 11 (2008), 017  [abstract]
arXive.org link: arXiv:0807.2817 [ abs, src, ps, others], cited by
Code: IPM/P-2008/059
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