“Ahmad Shirzad”

Tel:  +98 21 22809150
Fax:  +98 21 22809148
Email: 

IPM Positions

Resident Researcher, School of Particles and Accelerator
(2013 - Present )

Past IPM Positions

Resident Researcher, School of Physics
(1994 - 2004)

Non IPM Affiliations

Associate Professor of Isfahan University of Technology

Research Interests

Constrained Systems and Guage Theories

Present Research Project at IPM

Boundry Conditions as Constraints in Different Models

Related Papers

1. Z. Molaee and A. Shirzad
Hamiltonian formalism of the ghost free Tri(-Multi)gravity theory
Class.Quant.Grav 38 (2021),   [abstract]
arXive.org link: 1908.05041 [ abs, src, ps, others], cited by
Code: IPM/P.A-681
2. H. Khodabakhshi, A. Shirzad, F. Shojai and R. Mann
Black hole entropy and boundary conditions
Phys. Rev. D 101 (2020),   [abstract]
Code: IPM/P.A-646
3. E. Bakhshaei and A. Shirzad
Entanglement entropy and complexity of singular subregions in deformed CFT
Eur. Phys. J. C 79 (2019),   [abstract]
arXive.org link: 1902.02504 [hep-th] [ abs, src, ps, others], cited by
Code: IPM/P.A-576
4. K. Kargar, A. Shirzad and M. Monemzadeh
Dynamical structure of fields in light cone coordinates
Phys. Rev. D 99 (2019),   [abstract]
arXive.org link: 1608.03255 [hep-th] [ abs, src, ps, others], cited by
Code: IPM/P.A-572
5. H. Khodabakhshi, F. Shojai and A. Shirzad
On the classification of consistent boundary conditions for f(R)-gravity
Eur. Phys. J. C 78:1003 (2018),   [abstract]
Code: IPM/P.A-577
6. Z. Molaee and A. Shirzad
Hamiltonian structure of bi-gravity, problem of ghost and bifurcation
 (Submitted) [abstract]
arXive.org link: arXiv:1805.02179 [hep-th] [ abs, src, ps, others], cited by
Code: IPM/P.A-575
7. Z. Molaee and A. Shirzad
Massive gravity, canonical structure and gauge symmetry
Nucl. Phys. B 933 (2018), 248-261  [abstract]
arXive.org link: 1709.04847 [hep-th] [ abs, src, ps, others], cited by
Code: IPM/P.A-574
8. M. Hajihashemi and A. Shirzad
Hamiltonian structure of three-dimensional gravity in Vielbein formalism
Phys. Rev. D 97 (2018),   [abstract]
Code: IPM/P.A-522
9. E. Bakhshaei, A. Mollabashi and A. Shirzad
Holographic subregion complexity for singular surfaces
Eur. Phys. J. C 77 (2017),   [abstract]
arXive.org link: 1703.03469 [hep-th] [ abs, src, ps, others], cited by
Code: IPM/P.A-573
10. A. Akhavan, A. Ali Naseh, A. Nemati and A. Shirzad
New Bi-Gravities
 (Submitted) [abstract]
Code: IPM/P.A-440
11. A. Akhavan, M. Alishahiha, A. Naseh, A. Nemati and A. Shirzad
New Bi-Gravity from New Massive Garvity
JHEP 1605 (2016),   [abstract]
Code: IPM/P.A-431
12. M. Alishahiha, M. Majdzadeh Qaemmaqami, A. Naseh and A. Shirzad
Holographic Renormalization of 3D Minimal Massive Gravity
JHEP 1601 (2016),   [abstract]
Code: IPM/P.A-412
13. M. Alishahiha, M. M. Qaemmaqami, A. Naseh and A. Shirzad
On 3D Minimal Massive Gravity
JHEP 12 (2014),   [abstract]
Code: IPM/P.A-388
14. M. Sadegh and A. Shirzad
Constraint Structure of The Three-Dimensional Massive Gravity
Phys. Rev. D 83 (2011), 084040  [abstract]
Code: IPM/P-2011/010
15. M. Dehghan and A. Shirzad
Simplifying the Algebra o First Class Constraints, SO(3) as an Example
 (Preprint) [abstract]
arXive.org link: arXiv:0811.0917 [ abs, src, ps, others], cited by
Code: IPM/P-2008/070
16. A. Shirzad
Perfect and Imperfect Gauge Fixing
J. Math. Phys. 48 (2007), 082303  [abstract]
arXive.org link: hep-th/0609145 [ abs, src, ps, others], cited by
Code: IPM/P-2006/082
17. M. Dehghani and A. Shirzad
The Reduced Phase Space of An Open String in The Background B-Field
Eur. Phys. J. C 48 (2006),   [abstract]
arXive.org link: hep-th/0511248 [ abs, src, ps, others], cited by
Code: IPM/P-2006/080
18. M. Monemzadeh and A. Shirzad
Batalin-Fradkin-Tyutin Method for Mixed Constrained Systems and Chern-Simons Theory
Phys. Rev. D 72 (2005), 045004  [abstract]
Code: IPM/P-2005/076
19. M. Monemzadeh and A. Shirzad
Batalin-Fradkin-Tyutin Method for Mixed Constrained Systems and Chern-Simons Theory
Phys. Rev. D 72 (2005), 045004  [abstract]
Code: IPM/P-2005/076
20. A. Shirzad and M. Mojiri
The difficulty of symplectic analysis with second class systems
J. Math. Phys. 46 (2005), 012702  [abstract]
Code: IPM/P-2005/075
21. M. Monemzadeh and A. Shirzad
BFT Method for Mixed Constrained Systems and Chern-Simons Theory
Phys. Rev. D 72 (2005), 045004  [abstract]
arXive.org link: hep-th/0401230 [ abs, src, ps, others], cited by
Code: IPM/P-2004/072
22. A. Shirzad and M. Monemzadeh
The BFT Method With Chain Structure
Phys. Lett. B 584 (2004), 220-224  [abstract]
arXive.org link: hep-th/0311131 [ abs, src, ps, others], cited by
Code: IPM/P-2003/111
23. M. Monemzadeh and A. Shirzad
Finite Order BFFT Method
Int. J. Mod. Phys. A 18 (2003), 5613-5626  [abstract]
arXive.org link: hep-th/0301207 [ abs, src, ps, others], cited by
Code: IPM/P-2003/110
24. M. Mojiri and A. Shirzad
Chain Structure in Symplectic Analysis of a Constrained System
 (Preprint) [abstract]
arXive.org link: hep-th/0210119 [ abs, src, ps, others], cited by
Code: IPM/P-2002/092
25. A. Shirzad and F. Loran
Gauge fixing in the chain-by-chain method
Int. J. Mod. Phys. A 17 (2002), 4801-4808  [abstract]
arXive.org link: hep-th/9912289 [ abs, src, ps, others], cited by
Code: IPM/P-2002/019
26. F. Loran and A. Shirzad
Classification of Constraints Using the Chain-by-Chain Method
Int. J. Mod. Phys. A 17 (2002), 625-642  [abstract]
arXive.org link: hep-th/0003010 [ abs, src, ps, others], cited by
Code: IPM/P-2001/060
27. A. Shirzad and P. Moyassari
Dirac Quantization of Some Singular Theories
 (Preprint) [abstract]
arXive.org link: hep-th/0112194 [ abs, src, ps, others], cited by
Code: IPM/P-2001/086
28. A. Shirzad and M. Mojiri
Constraint Structure in Modified Faddeev-Jackiw Method
Mod. Phys. Lett. A 16 (2001), 2439-2448  [abstract]
arXive.org link: hep-th/0110023 [ abs, src, ps, others], cited by
Code: IPM/P-2001/035
29. M.M. Sheikh-Jabbari and A. Shirzad
Boundary Conditions as Dirac Constraints
Eur. Phys. J. C 19 (2001), 383-390  [abstract]
arXive.org link: hep-th/9907055 [ abs, src, ps, others], cited by
Code: IPM/P-1999/037
30. N. Sadeghnezhad and A. Shirzad
Gauge Generators in Lagrangian and Hamiltonian Formulations
 (Preprint) [abstract]
Code: IPM/P-1998/021
31. A. Shirzad and M. Shabani Moghadam
Generator of Gauge Transformetion and Hamiltonian Constaint Structure
 (Preprint) [abstract]
Code: IPM/P-1998/020
32. N. Sadeghnezhad and A. Shirzad
Lagrangian and Hamiltonian Constraint Structure Coefficients
J. Phys. A: Math. Gen. 31 (1998), 7403-7413  [abstract]
Code: IPM/P-1998/002
33. A. Shirzad
Gauge Symmetry in Lagrangian Formulation and Schwinger Model
J. Phys. A: Math. Gen. 31 (1998), 2747-2760  [abstract]
Code: IPM/P-1997/013
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