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GSS: Gauge and String Theories GSS: Gauge and String Theories S. Bellucci (Resp.), S. Ferrara (Ass.), S. Krivonos (Osp.), A. Sutulin (Bors. PD), B.N. Tiwari (Ospite), A. Yeranyan (Bors. Fermi Institute) Research Activity S. Ferrara investigated different aspects of black-hole physics, which include a classification of charge- orbits for extremal single-center black holes and first-order flows of extremal black holes with different BPS properties. He also investigated some aspects of multi-center black holes and, in particular, the classification of two-center orbits and first order flows for multi-center composites. He studied several aspects of supersymmetry breaking. Applications to Particle Physics or to inflation rest on N=1 spontaneously broken supergravity where some multiplets mediate supersymmetry breaking while others accommodate the inflaton. The supersymmetric extension of the Starobinsky model depends on the off-shell formulation of the local supersymmetry algebra. This allows one to show the equivalence of this higher curvature theory to a standard Einstein supergravity. Depending on the chosen formulation the model corresponds to supergravity coupled either to two massive chiral multiplets, one of which is the goldstino multiplet, or to a massive vector multiplet. He also introduced a set of minimal models, where the inflaton sector is described by a single scalar field (with D term and Fayet-Iliopoulos term generating potential), unlike in models based on chiral multiplets based on an F-term potential. In minimal models the scalaron is dual to the inflaton, and being the member of a massive vector multiplet, it is the superpartner of the Stueckelberg field. Subsequently, replacing the Goldstino multiplet with its non-linear realization via a nilpotent superfield, he arrived at a new universal Volkov-Akulov-Starobinsky Supergravity. Using this technique new inflationary models were recently constructed by a number of authors. This modification simplifies significantly a broad class of models, the simplest one of which is chaotic inflation, and serves as an uplifting tool in the KKLT-type string theory landscape. Ferrara proposed a novel type of multi-field supersymmetric Born-Infeld theories, which reduce to the supersymmetric Born-Infeld action in the case of a single vector multiplet. These multi-field extensions, unlike previous proposals, possess a second non-linearly realized supersymmetry, and in fact can be obtained starting from standard N=2 supersymmetric field theories with N=1 vacua. Their classification rests on deep results in Algebraic Geometry. In the preprint Comments on N= 2 Born-Infeld Attractors S. Bellucci, S Krivonos, A Sutulin arXiv preprint arXiv:1411.5592 Bellucci, Sutulin et al. considered the N=2 supersymmetric Born-Infeld action and discussed some of the peculiar characteristics of the new approach by Ferrara to multi-field supersymmetric Born-Infeld theories. In the papers: Wightman function and the Casimir effect for a Robin sphere in a constant curvature space, S. Bellucci, AA Saharian, NA Saharyan The European Physical Journal C 74 (9), 1-19 (2014) Casimir densities from coexisting vacua S. Bellucci, AA Saharian, AH Yeranyan Physical Review D 89 (10), 105006 (2014) Finite temperature fermionic condensate and currents in topologically nontrivial spaces S. Bellucci, ERB de Mello, AA Saharian Physical Review D 89 (8), 085002 (2014) Fermionic vacuum polarization in compactified cosmic string spacetime S. Bellucci, ERB de Mello, A de Padua, AA Saharian Eur. Phys. J. C 74, 2688 (2014) S. Bellucci and coworkers considered field theory in curved space and cosmological implications. In the paper Partial breaking of global supersymmetry and super particle actions S. Bellucci, N Kozyrev, S Krivonos, A Sutulin Journal of High Energy Physics 2014 (1), 1-16 Bellucci, Sutulin et al. showed, based on the finding that the component on-shell actions for the theories with one half spontaneous breaking of global supersymmetries have an extremely simple form, being written in terms of proper physical components, that on-shell component super particle actions have a universal form, in which the physical fermions enter the action through the ein-bein and the space-time derivatives of the matter fields, only. Bellucci presented the talk “Coset approach to supersymmetric component actions”, as an Invited Presentation at the EU-Russia-JINR@Dubna Round Table What next?: Theoretical and Experimental Physics after the discovery of the Brout-Englert- Higgs boson, March 3 – 5, 2014. Bellucci presented the talk “Nonlinear realizations and supersymmetric component action approach”, as an Invited Presentation at the XXIInd International Conference on Integrable Systems and quantum symmetries (Prague, June 23–29, 2014). Bellucci presented the talk “Partial breaking of global supersymmetry within the coset approach”, as an Invited Presentation at the 5th International Workshop “Supersymmetry in Integrable Systems” held at the Bogoliubov Laboratory of Theoretical Physics of the Joint Institute for Nuclear Research from September 11 to September 13 of 2014. Bellucci organized the Workshop “Breaking of Supersymmetry and Ultraviolet Divergences in Extended Supergravity” (INFN-LNF, March 25 - 29, 2013), where he presented the talk “Partial Breaking of Global Supersymmetry in d=1”. Bellucci published the volume “Black Objects in Supergravity”, Springer Proceedings in Physics, vol. 144, pp. 1-358 (2013), ISSN 0930-8989 ISSN 1867-4941 (electronic), ISBN 978-3-319-00214-9 ISBN 978-3-319-00215-6 (eBook), DOI 10.1007/978-3-319-00215-6, Springer Cham Heidelberg New York Dordrecht London. Bellucci published the volume “Supersymmetric Gravity and Black Holes”, Springer Proceedings in Physics Volume 142, 2013, S. Bellucci ed., Bellucci published the volume “Breaking of Supersymmetry and Ultraviolet Divergences in Extended Supergravity”, Springer Proceedings in Physics Volume 153, 2014, DOI 10.1007/978-3-319-03774-5. Another member of the group at LNF-INFN, Armen Yeranyan, worked on black holes and Born-Infeld theory. The problems posed in this project are a natural continuation of our previous results obtained in recent years also within the framework of the ERC grant “SUPERFIELDS”(N.226455, 2009-2014) and in collaboration with groups from Torino University, Padua University, JINR-Dubna, Yerevan State University and CERN. List of Conference Talks S. Bellucci, Coset approach to supersymmetric component actions, Invited Presentation at the EU- Russia-JINR@Dubna Round Table What next?: Theoretical and Experimental Physics after the discovery of the Brout-Englert-Higgs boson, March 3 – 5, 2014. S. Bellucci, Nonlinear realizations and supersymmetric component action approach, XXIInd International Conference on Integrable Systems and quantum symmetries (Prague, June 23–29, 2014), S. Bellucci, Partial breaking of global supersymmetry within the coset approach, Invited Presentation at the 5th International Workshop “Supersymmetry in Integrable Systems” held at the Bogoliubov Laboratory of Theoretical Physics of the Joint Institute for Nuclear Research from September 11 to September 13 of 2014. Publications by LNF Authors in the Year 2014 [1] Partial breaking of global supersymmetry and super particle actions, S. Bellucci, N Kozyrev, S Krivonos, A Sutulin, arXiv preprint arXiv:1309.3902, published in Journal of High Energy Physics 2014 (1), 1-16 [2] Wightman function and the Casimir effect for a Robin sphere in a constant curvature space, S. Bellucci, AA Saharian, NA Saharyan, The European Physical Journal C 74 (9), 1-19 (2014) [3] Casimir densities from coexisting vacua, S. Bellucci, AA Saharian, AH Yeranyan, Physical Review D 89 (10), 105006 (2014) [4] Finite temperature fermionic condensate and currents in topologically nontrivial spaces, S. Bellucci, ERB de Mello, AA Saharian, Physical Review D 89 (8), 085002 (2014) [5] Fermionic vacuum polarization in compactified cosmic string spacetime, S. Bellucci, ERB de Mello, A de Padua, AA Saharian, Eur. Phys. J. C 74, 2688 (2014) [6] State-Space Geometry, Statistical Fluctuations, and Black Holes in String Theory, S. Bellucci, BN Tiwari, Advances in High Energy Physics vol. 2014, Hindawi Publishing Corporation, (2014) [7] Component on-shell actions of supersymmetric 3-branes II. 3-brane in D= 8, S. Bellucci, N Kozyrev, S Krivonos, A Sutulin, arXiv preprint arXiv:1411.7550 [hep-th]. [8] Comments on N= 2 Born-Infeld Attractors, S. Bellucci, S Krivonos, A Sutulin arXiv preprint arXiv:1411.5592 [hep-th]. [9] Component on shell actions of supersymmetric 3-brane I. 3-brane in D= 6, S. Bellucci, N Kozyrev, S Krivonos, A Sutulin, arXiv preprint arXiv:1409.0641, to appear in Class. Quantum Grav. [10] Supermembrane in D= 5: component action, S. Bellucci, N Kozyrev, S Krivonos, A Yeranyan, Journal of High Energy Physics 2014 (5), 1-18 [11] Partial breaking of global supersymmetry and super particle actions, S. Bellucci, N Kozyrev, S Krivonos, A Sutulin, Journal of High Energy Physics 2014 (1), 1-16 [12] Coset approach to the partial breaking of global supersymmetry, S. Bellucci, S Krivonos, A Sutulin, Breaking of Supersymmetry and Ultraviolet Divergences in Extended Supergravity, Pages 205-248, Springer International Publishing Editor (2014). [13] Supersymmetry breaking by higher dimension operators, Fotis Farakos, Sergio Ferrara , Alex Kehagias , Massimo Porrati, Nuclear Physics B Vol. 879 Elsevier Netherlands 01/02/2014 348-369 [14] On the topology of the inflaton field in minimal supergravity models, Sergio Ferrara, Pietro Fré
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