Augusto Sagnotti

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Augusto Sagnotti
Cern Sagnotti.jpg
Born 1955
Rome, Italy
Nationality Italian
Alma mater University of Rome "La Sapienza", California Institute of Technology
Known for Ultraviolet divergences of Einstein gravity, orientifolds, higher spins
Scientific career
Fields Theoretical physics
Institutions Scuola Normale Superiore
Doctoral advisor John H. Schwarz

Augusto Sagnotti (born 1955) is a Professor of Theoretical Physics at Scuola Normale (since 2005).


Sagnotti earned a Laurea in Electrical Engineering from the University of Rome "La Sapienza" in 1978 (advisors: Bruno Crosignani and Paolo Di Porto); and a Ph.D. in Theoretical Physics from Caltech in 1983 (advisor: John H. Schwarz). He was Post-Doctoral Fellow at Caltech (1983–84) and Miller Research Fellow at U.C. Berkeley (1984–86). He was Junior Faculty at the University of Rome "Tor Vergata" from 1986 to 1994, then Associate Professor (1994–99) and Professor (2000-2005). He was also a visiting Professor at several international Institutions, including University of Brussels, CERN, DESY, UCLA, Princeton, Humboldt Universitat, University of Cambridge, University of Oxford, Ecole Normale Superieure, IHES, Ecole Polytechnique, UAM Madrid, U. Uppsala, U. Warsaw. His research activity has been devoted to the quantization of the gravitational field, to String Theory, to Conformal Field Theory and to Higher-Spin Gauge Fields.

Sagnotti's main contribution to physics is perhaps the analysis of the 2-loop divergences in Einstein's theory of General Relativity.[1][2] Moreover, he was the first to propose, in 1988, that the type I string theory can be obtained as an orientifold of type IIB string theory,[3] with 32 half-D9-branes added in the vacuum to cancel various anomalies[4][5] and offered the elucidation of the key properties of orientifold constructions and of Conformal Field Theory on non-orientable surfaces.[6][7][8][9][10] He also discovered the 10D "0B' string", including both open and closed strings, non supersymmetric but free of tachyons.[11][12] He has worked extensively on higher spins, arriving at a geometric formulation of their free field equations in terms of higher-spin curvatures.[13]

More recently, Sagnotti has been working on the proposal of a possible link between "brane supersymmetry breaking",[14][15][16][17] and the onset of the inflationary phase, and on the exploration of some of its possible imprints on the CMB,[18] in particular, the proposal that the low value of the CMB quadrupole[19] and a first peak for l ~5[20] be a manifestation of the onset of the inflationary phase.

Awards and honors[edit]

Sagnotti received the Carosio Prize from the University of Rome “La Sapienza” in 1979, a Miller Fellowship from U.C. Berkeley in 1984, shared with Massimo Bianchi the 1994 SIGRAV Prize of the Italian Society for General Relativity and Gravitation and received the Margherita Hack Prize for Science in 2014 for his work on the quantization of gravity. He was also Andrejewski Lecturer at Humbodt Universitat in Berlin in 1999.


  • String Theory, eds. C. Procesi and A. Sagnotti (Academic Press, 1988)
  • String Theory, Quantum Gravity and the Unification of the Fundamental Interactions, eds. M. Bianchi, F. Fucito, V. Marinari and A. Sagnotti (World Scientific, 1992)


  1. ^ Goroff, M. H.; Sagnotti, A. (1985). "Quantum gravity at two loops". Physics Letters B. 160 (1–3): 81. Bibcode:1985PhLB..160...81G. doi:10.1016/0370-2693(85)91470-4. 
  2. ^ Goroff, M. H.; Sagnotti, A. (1986). "The ultraviolet behavior of Einstein gravity". Nuclear Physics B. 266 (3–4): 709. Bibcode:1986NuPhB.266..709G. doi:10.1016/0550-3213(86)90193-8. 
  3. ^ Sagnotti, A. (1988). "Open strings and their symmetry groups". In 't Hooft, G.; Jaffe, A.; Mack, G.; Mitter, P. K.; Stora, R. Nonperturbative Quantum Field Theory. Plenum Publishing Corporation. pp. 521–528. arXiv:hep-th/0208020Freely accessible. 
  4. ^ Sagnotti, A. (1992). "A note on the Green–Schwarz mechanism in open-string theories". Physics Letters B. 294 (2): 196–203. arXiv:hep-th/9210127Freely accessible. Bibcode:1992PhLB..294..196S. doi:10.1016/0370-2693(92)90682-T. 
  5. ^ Angelantonj, C.; Sagnotti, A. (2002). "Open strings". Physics Reports. 371 (376): 1–150. arXiv:hep-th/0204089Freely accessible. Bibcode:2002PhR...371....1A. doi:10.1016/S0370-1573(02)00273-9. 
  6. ^ Pradisi, G.; Sagnotti, A. (1989). "Open string orbifolds". Physics Letters B. 216 (1–2): 59. Bibcode:1989PhLB..216...59P. doi:10.1016/0370-2693(89)91369-5. 
  7. ^ Bianchi, M.; Sagnotti, A. (1990). "On the systematics of open string theories". Physics Letters B. 247 (4): 517. Bibcode:1990PhLB..247..517B. doi:10.1016/0370-2693(90)91894-H. 
  8. ^ Bianchi, M.; Pradisi, G.; Sagnotti, A. (1992). "Toroidal compactification and symmetry breaking in open string theories". Nuclear Physics B. 376 (2): 362. Bibcode:1992NuPhB.376..365B. doi:10.1016/0550-3213(92)90129-Y. 
  9. ^ Fioravanti, D.; Pradisi, G.; Sagnotti, A. (1993). "Sewing constraints and non-orientable open strings". Physics Letters B. 321 (4): 349–354. arXiv:hep-th/9311183Freely accessible. Bibcode:1994PhLB..321..349F. doi:10.1016/0370-2693(94)90255-0. 
  10. ^ Pradisi, Gianfranco; Sagnotti, Augusto; Stanev, Yassen S. (1996). "Completeness conditions for boundary operators in 2D conformal field theory". Physics Letters B. 381: 97–104. arXiv:hep-th/9603097Freely accessible. Bibcode:1996PhLB..381...97P. doi:10.1016/0370-2693(96)00578-3. 
  11. ^ Sagnotti, A. (1995). "Some properties of open-string theories". arXiv:hep-th/9509080Freely accessible. 
  12. ^ Sagnotti, A. (1997). "Surprises in open-string perturbation theory". Nuclear Physics B: Proceedings Supplements. 56 (3): 332–343. arXiv:hep-th/9702093Freely accessible. Bibcode:1997NuPhS..56..332S. doi:10.1016/S0920-5632(97)00344-7. 
  13. ^ Francia, D.; Sagnotti, A. (2002). "Free geometric equations for higher spins". Physics Letters B. 543 (3–4): 303. arXiv:hep-th/0207002Freely accessible. Bibcode:2002PhLB..543..303F. doi:10.1016/S0370-2693(02)02449-8. 
  14. ^ Sugimoto, S. (1999). "Anomaly cancellations in the type I D9-D9 system and the USp(32) string theory". Progress of Theoretical Physics. 102 (3): 685–699. arXiv:hep-th/9905159Freely accessible. Bibcode:1999PThPh.102..685S. doi:10.1143/PTP.102.685. 
  15. ^ Antoniadis, I.; Dudas, E.; Sagnotti, A. (1999). "Brane supersymmetry breaking". Physics Letters B. 464: 38–45. arXiv:hep-th/9908023Freely accessible. Bibcode:1999PhLB..464...38A. doi:10.1016/S0370-2693(99)01023-0. 
  16. ^ Angelantonj, C. (1999). "Comments on open-string orbifolds with a non-vanishing Bab". Nuclear Physics B. 566: 126–150. arXiv:hep-th/9908064Freely accessible. Bibcode:2000NuPhB.566..126A. doi:10.1016/S0550-3213(99)00662-8. 
  17. ^ Aldazabal, G.; Uranga, A. M. (1999). "Tachyon-free non-supersymmetric type IIB orientifolds via brane-antibrane systems". Journal of High Energy Physics. 1999 (10): 24. arXiv:hep-th/9908072Freely accessible. Bibcode:1999JHEP...10..024A. doi:10.1088/1126-6708/1999/10/024. 
  18. ^ Kitazawa, N.; Sagnotti, A. (2014). "Pre-inflationary clues from string theory?". Journal of Cosmology and Astroparticle Physics. 2014 (4): 17. arXiv:1402.1418Freely accessible. Bibcode:2014JCAP...04..017K. doi:10.1088/1475-7516/2014/04/017. 
  19. ^ Hu, W. "Quadrupole types and polarization patterns". University of Chicago. Retrieved 2014-07-25. 
  20. ^ Abdalla, F. B. "Observational cosmology: The CMB" (PDF). University College London. Retrieved 2014-07-26.