Research
Loop Quantum Gravity
Coherent states, semiclassical limit, vertex amplitudes, twisted geometries, twistorial parametrization, Lorentz invariance, matter coupling, ...
Canonical quantization
- F. Anza and S. Speziale, A note on the secondary constraints in loop quantum gravity, Class. Quantum Grav. 32 (2015) 195015, ArXiv 1409.0836
- S. Speziale, Loop quantum gravity, twistors, and some perspectives on the problem of time, EPJ Web Conf. 71 (2014) 00123, ArXiv 1404.4167
- M. Dupuis, J. P. Ryan and S. Speziale, Discrete gravity models and Loop Quantum Gravity: a short review, SIGMA 8 (2012) 052, ArXiv 1204.5394
- P. Dona , S. Speziale, Introductory lectures to loop quantum gravity, in `Gravitation Théorie et Expérience', Ed. A. Bounames and A. Makhlouf, Paris: Hermann (2013), ArXiv 1007.0402
- C. Rovelli, S. Speziale, Lorentz covariance of loop quantum gravity, Phys. Rev. D83, 104029 (2011), ArXiv 1012.1739
- C. Rovelli and S. Speziale, Reconcile Planck-scale discreteness and the Lorentz-Fitzgerald contraction, Phys. Rev. D67, 064019 (2003), ArXiv gr-qc/0205108
Coherent states
- A. Calcinari, L. Freidel, E. Livine and S. Speziale, Twisted Geometries Coherent States for Loop Quantum Gravity, Class. Quant. Grav. 38 (2020) no.2, 025004, ArXiv 2009.01125
- E. R. Livine and S. Speziale, New spinfoam vertex for quantum gravity, Phys. Rev. D76, 084028 (2007), ArXiv 0705.0674
- E. R. Livine and S. Speziale, Physical boundary state for the quantum tetrahedron, Class. Quantum Grav. 25 (2008) 085003, ArXiv 0711.2455
- E. R. Livine and S. Speziale, Group integral techniques for the spinfoam graviton propagator, JHEP 11 (2006) 092, ArXiv gr-qc/0608131
- C. Rovelli and S. Speziale, A semiclassical tetrahedron, Class. Quant. Grav. 23 (2006) 5861 - 5870, ArXiv gr-qc/0606074
Vertex amplitudes and spin foams
- P. Dona, M. Fanizza, P. Martin-Dussaud and S. Speziale, Asymptotics of SL(2,C) coherent invariant tensors, ArXiv 2011.13909
- P. Dona and S. Speziale, Asymptotics of lowest unitary SL(2,C) invariants on graphs, Phys. Rev. D102 (2020) no.8, 086016, ArXiv 2007.09089
- P. Donà, M. Fanizza, G. Sarno and S. Speziale, Numerical study of the Lorentzian EPRL spin foam amplitude, Phys. Rev. D100 (2019) 10, 106003, ArXiv 1903.12624
- G. Sarno , S. Speziale and G. Stagno, 2-vertex Lorentzian Spin Foam Amplitudes for Dipole Transitions, Gen.Rel.Grav. 50 (2018) no.4, 43, ArXiv 1801.03771
- S. Speziale Boosting Wigner's nj-symbols, J.Math.Phys. 58 (2017) 3, 032501, ArXiv 1609.01632
- M. Dupuis, L. Freidel, E. R. Livine, S. Speziale, Holomorphic Lorentzian Simplicity Constraints, J.Math.Phys. 53 (2012) 032502, ArXiv 1107.5274
- V. Bonzom, E. R. Livine and S. Speziale, Recurrence relations for spin foam vertices, Class. Quantum Grav. 27 (2010) 125002, ArXiv 0911.2204
- C. Perini, C. Rovelli and S. Speziale, Self-energy and vertex radiative corrections in LQG, Phys. Lett. B682 (2009) 78, ArXiv 0810.1714
- E. R. Livine and S. Speziale, Solving the Simplicity Constraints for Spinfoam Quantum Gravity, EuroPhys. Lett. 81 (2008) 50004, ArXiv 0708.1915 [gr-qc]
- S. Speziale, Coupling gauge theory to 3d spinfoam quantum gravity, Class. Quantum Grav. 24 (2007) 5139-5159, ArXiv 0706.1534
- J. Hackett and S. Speziale, Grasping rules and semiclassical limit of the geometry in the Ponzano-Regge model, Class. Quant. Grav. 24 (2007) 1525, ArXiv gr-qc/0611097
- D. Oriti, C. Rovelli and S. Speziale, Spinfoam 2d quantum gravity and discrete bundles, Class. Quant. Grav. 22 (2005) 85, ArXiv gr-qc/0406063
Twisted geometries and twistorial parametrization
- P. Dona, M. Fanizza, G. Sarno and S. Speziale, SU(2) graph invariants, Regge actions and polytopes, Class.Quant.Grav. 35 (2018) no.4, 045011, ArXiv 1708.01727
- S. Speziale and W. M. Wieland, The twistorial structure of loop-gravity transition amplitudes, Phys. Rev. D86 (2012) 124023, ArXiv 1207.6348
- E. R. Livine, S. Speziale, J. Tambornino, Twistor Networks and Covariant Twisted Geometries, Phys. Rev. D85 (2012) 064002, ArXiv 1108.0369
- S. Speziale and M. Zhang, Null twisted geometries, Phys. Rev. D89 (2014) 084070, ArXiv 1311.3279
- M. Dupuis, S. Speziale and J. Tambornino, Spinors and Twistors in Loop Gravity and Spin Foams, PoS QGQGS 2011, 021 (2011), ArXiv 1201.2120
- E. Bianchi, P. Dona , S. Speziale, Polyhedra in loop quantum gravity, Phys. Rev. D83 (2011) 044035, ArXiv 1009.3402
- C. Rovelli and S. Speziale, On the geometry of loop quantum gravity on a graph, Phys. Rev. D82, 044018 (2010, ArXiv 1005.2927 )
- L. Freidel and S. Speziale, Twisted geometries: A geometric parametrisation of SU(2) phase space, Phys. Rev D82 (2010) 084040, ArXiv 1001.2748
- M. Langvik, S. Speziale, Twisted geometries, twistors and conformal transformations, Phys.Rev. D94 (2016) 2, 024050, ArXiv 1602.01861
- L. Freidel and S. Speziale, From twistors to twisted geometries, Phys. Rev D82 (2010) 084041, ArXiv 1006.0199
Spin foam correlations and graviton propagator
- S. Speziale, Background-free propagation in loop quantum gravity, Adv. Sci. Lett. 2 (2009) 280, ArXiv 0810.1978
- J. D. Christensen, I. Khavkine, E. R. Livine and S. Speziale, Sub-leading asymptotic behaviour of area correlations in the Barrett-Crane model, Class. Quant. Grav. 27 (2010) 035012, ArXiv 0908.4476
- J. D. Christensen, E. R. Livine, S. Speziale, Numerical evidence of regularized correlations in spin foam gravity, Phys. Lett. B670 (2009) 403, ArXiv 0710.0617
- E. R. Livine and S. Speziale, Group integral techniques for the spinfoam graviton propagator, JHEP 11 (2006) 092, ArXiv gr-qc/0608131
- E. Bianchi, L. Modesto, C. Rovelli and S. Speziale, Graviton propagator in loop quantum gravity, Class. Quant. Grav. 23 (2006) 6989, ArXiv gr-qc/0604044
- V. Bonzom, E. R. Livine, M. Smerlak, S. Speziale, Towards the graviton from spinfoams: the complete perturbative expansion of the 3d toy model, Nucl. Phys. B 804(2008) 507, ArXiv 0802.3983
- E. R. Livine, S. Speziale and J. L. Willis, Towards the graviton from spinfoams: higher order corrections in the 3d toy model, Phys. Rev. D75 (2007) 024038, ArXiv gr-qc/0605123
- S. Speziale, Towards the graviton from spinfoams: the 3d toy model, JHEP 05 (2006) 039, ArXiv gr-qc/0512102 [arXiv:].
General Relativity
Study of quasi-local observables, asymptotic symmetries, flux-balance laws, Hamiltonian structures on null hypersurfaces, ...
- L. Freidel, R. Oliveri, D. Pranzetti and S. Speziale, Extended corner symmetry, charge bracket and Einstein's equations, ArXiv 2104.12881
- L. Freidel, R. Oliveri, D. Pranzetti and S. Speziale, The Weyl BMS group and Einstein's equations, ArXiv 2104.05793
- R. Oliveri and S. Speziale, A note on dual gravitational charges, JHEP 12 (2020), 079, ArXiv 2010.01111
- R. Oliveri and S. Speziale, Boundary effects in General Relativity with tetrad variables, Gen. Rel. Grav. 52 (2020) no.8, 83, ArXiv 1912.01016
- E. De Paoli and S. Speziale, A gauge-invariant symplectic potential for tetrad general relativity, JHEP 1807 (2018) 040, ArXiv 1804.09685
- E. De Paoli and S. Speziale, Sachs' free data in real connection variables, JHEP 1711 (2017) 205, ArXiv 1707.00667
- S. Alexandrov and S. Speziale, First order gravity on the light front, Phys.Rev. D91 (2015) 6, 064043, ArXiv 1412.6057
- L. Freidel and S. Speziale, On the relations between gravity and BF theories, SIGMA 8 (2012) 032, ArXiv 1201.4247
- L. Smolin and S. Speziale, A note on the Plebanski action with cosmological constant and an Immirzi parameter, Phys. Rev. D81 (2010) 024032, ArXiv 0908.3388
Discrete Models of Gravity
Regge calculus, area-angle variables, twisted geometries, polyhedra and polytopes, ...
- P. Dona, M. Fanizza, G. Sarno and S. Speziale, SU(2) graph invariants, Regge actions and polytopes, Class.Quant.Grav. 35 (2018) no.4, 045011, ArXiv 1708.01727
- E. Bianchi, P. Dona , S. Speziale, Polyhedra in loop quantum gravity, Phys. Rev. D83 (2011) 044035, ArXiv 1009.3402
- C. Rovelli and S. Speziale, On the geometry of loop quantum gravity on a graph, Phys. Rev. D82, 044018 (2010, ArXiv 1005.2927
- L. Freidel and S. Speziale, Twisted geometries: A geometric parametrisation of SU(2) phase space, Phys. Rev D82 (2010) 084040, ArXiv 1001.2748
- B. Dittrich and S. Speziale, Area-angle variables for general relativity, New J. Phys. 10 (2008) 083006, ArXiv 0802.0864
- B. Dittrich, L. Freidel and S. Speziale, Linearized dynamics from the 4-simplex Regge action, Phys. Rev. D76, 104020 (2007), ArXiv 0707.4513
Modified theories of gravity
Torsion, massive gravity, bi-metric theories, modified Plebanski action, single-graviton bi-metric, ...
- S. Alexandrov, S. Speziale and T. Zlosnik, Canonical structure of minimal varying Lambda theories, ArXiv 2104.03753
- S. Alexandrov and S. Speziale, Bi-gravity with a single graviton, JHEP 1908 (2019) 070, ArXiv 1904.11906
- S. Speziale, Raychaudhuri and optical equations for null geodesic congruences with torsion, Phys. Rev. D 98, 084029, ArXiv 1808.00952
- T. De Lorenzo, E. De Paoli and S. Speziale, Spacetime Thermodynamics with Contorsion, Phys.Rev. D98 (2018) 064053, ArXiv 1807.02041
- S. Alexandrov, K. Krasnov and S. Speziale, Chiral description of ghost-free massive gravity, JHEP 1306 (2013) 068, ArXiv 1212.3614
- D. Beke, G. Palmisano , S. Speziale, Pauli-Fierz Mass Term in Modified Plebanski Gravity, JHEP 1203 (2012) 069, ArXiv 1112.4051
- S. Speziale, Bi-metric theory of gravity from the non-chiral Plebanski action, Phys. Rev. D82 , 064003 (2010), ArXiv 1003.4701
- A. Ishibashi and S. Speziale, Spherically symmetric black holes in minimally modified self-dual gravity, Class. Quant. Grav. 26 (2009) 175005, ArXiv 0904.3914
Quantum field theory
Renormalization of the Immirzi parameter, functional propagation kernel, TQFTs, ...
- D. Benedetti and S. Speziale, Perturbative running of the Immirzi parameter, J.Phys.Conf.Ser. 360 (2012) 012011, ArXiv 1111.0884
- D. Benedetti, S. Speziale, Perturbative quantum gravity with the Immirzi parameter, JHEP 1106, 107 (2011), ArXiv 1104.4028
- C. Rovelli and S. Speziale, On the expansion of a quantum field theory around a topological sector, Gen. Rel. Grav. 39 (2007) 167, ArXiv gr-qc/0508106
- F. Mattei, C. Rovelli, S. Speziale and M. Testa, From 3-geometry transition amplitudes to graviton states, Nucl. Phys. B739 (2006) 234, ArXiv gr-qc/0508007
Twistor theory
Symplectic structures in twistor spaces
Quantum black holes
Non-singular black hole models, Planck stars, tunnelling scenarios, ...
- M. Christodoulou, C. Rovelli, S. Speziale, I. Vilensky Planck star tunneling time: An astrophysically relevant observable from background-free quantum gravity, Phys.Rev. D94 (2016) 8, 084035, ArXiv 1605.05268
- T. De Lorenzo, A. Giusti, S. Speziale, Non-singular rotating black hole with a time delay in the center, Gen.Rel.Grav. 48 (2016) no.3, 31, ArXiv 1510.08828
- T. De Lorenzo, C. Pacilio , C. Rovelli, S. Speziale, On the Effective Metric of a Planck Star, Gen.Rel.Grav. 47 (2015) 4, 41, ArXiv 1412.6015
- A. Ishibashi and S. Speziale, Spherically symmetric black holes in minimally modified self-dual gravity, Class. Quant. Grav. 26 (2009) 175005, ArXiv 0904.3914
Mathematical physics
Group representation theory, saddle point approximations, ...
- P. Dona, M. Fanizza, P. Martin-Dussaud and S. Speziale, Asymptotics of SL(2,C) coherent invariant tensors, ArXiv 2011.13909
- P. Dona and S. Speziale, Asymptotics of lowest unitary SL(2,C) invariants on graphs, Phys. Rev. D102 (2020) no.8, 086016, ArXiv 2007.09089
- P. Dona, M. Fanizza, G. Sarno and S. Speziale, SU(2) graph invariants, Regge actions and polytopes, Class.Quant.Grav. 35 (2018) no.4, 045011, ArXiv 1708.01727
- S. Speziale Boosting Wigner's nj-symbols, J.Math.Phys. 58 (2017) 3, 032501, ArXiv 1609.01632
Other
Grand unified theories, quantum cosmology, ...
- J. Magueijo, T. Zlosnik and S. Speziale, Quantum cosmology of a dynamical Lambda, Phys. Rev. D102 (2020) no.6, 064006, ArXiv 2006.05766
- A. G. Lisi, L. Smolin and S. Speziale, Unification of gravity, gauge fields, and Higgs bosons, J. Phys. A43, 445401 (2010), ArXiv 1004.4866
