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A superfield constraint for N=2 --> N=0 breaking
/ Dudas, E. (Ecole Polytechnique, CPHT) ; Ferrara, S. (CERN ; Frascati ; UCLA) ; Sagnotti, A. (Pisa, Scuola Normale Superiore ; INFN, Pisa)
We identify a cubic holomorphic constraint that subtends the total breaking of N=2 supersymmetry in a vector multiplet and exhibit its microscopic origin. The new constraint leaves behind, at low energies, a vector and the two goldstini, in a non-linear Lagrangian that generalizes the N=2 Volkov-Akulov model..
arXiv:1707.03414; CERN-TH-2017-131; CPHT-RR043.062017.-
2017-08-24 - 26 p.
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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Cosmology and Supergravity
/ Ferrara, S. (CERN ; Frascati ; UCLA) ; Kehagias, A. (Natl. Tech. U., Athens) ; Sagnotti, A. (Pisa, Scuola Normale Superiore ; INFN, Pisa)
Abdus Salam was a true master of 20th Century Theoretical Physics. Not only was he a pioneer of the Standard Model (for which he shared the Nobel Prize with S. [...]
CERN-TH-2016-110; arXiv:1605.04791; CERN-TH-2016-110.-
Geneva : CERN, 2016-09-08 - 19 p.
- Published in : Int. J. Mod. Phys. A 31 (2016) 1630044
Preprint: PDF; External link: Preprint
In : Memorial Meeting for Nobel Laureate Professor Abdus Salam's 90th Birthday, Singapore, Singapore, 25 - 28 Jan 2016, pp.1630044
Memorial meeting for professor Abdus Salam's 90th birthday, Singapore, 25 - 28 Jan 2016, pp.449-468
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Two-field Born–Infeld with diverse dualities
/ Ferrara, S. (CERN ; Frascati ; UCLA) ; Sagnotti, A. (Pisa, Scuola Normale Superiore ; INFN, Pisa) ; Yeranyan, A. (Enrico Fermi Ctr., Rome ; Frascati)
We elaborate on how to build, in a systematic fashion, two-field Abelian extensions of the Born-Infeld Lagrangian. These models realize the non-trivial duality groups that are allowed in this case, namely U(2), SU(2) and U(1)xU(1). [...]
CERN-TH-2016-017; arXiv:1602.04566.-
Geneva : CERN, 2016-11 - 22 p.
- Published in : Nucl. Phys. B 912 (2016) 305-326
Article from SCOAP3: PDF; Preprint: PDF; External link: Preprint
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Supersymmetry and Inflation
/ Ferrara, Sergio (CERN ; Frascati ; UCLA) ; Sagnotti, A. (Pisa, Scuola Normale Superiore ; INFN, Pisa)
Theories with elementary scalar degrees of freedom seem nowadays required for simple descriptions of the Standard Model and of the Early Universe. It is then natural to embed theories of inflation in supergravity, also in view of their possible ultraviolet completion in String Theory. [...]
CERN-PH-TH-2015-214; arXiv:1509.01500; CERN-PH-TH-2015-214.-
Geneva : CERN, 2017 - 22 p.
- Published in : PoS PLANCK2015 (2015) 113
Fulltext: fulltext1391782 - PDF; PoS(PLANCK 2015)113 - PDF; Preprint: PDF; Published version from PoS: PDF; External link: PoS server
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Scale invariant Volkov–Akulov supergravity
/ Ferrara, S. (CERN ; Frascati ; UCLA) ; Porrati, M. (CERN ; New York U., CCPP) ; Sagnotti, A. (CERN ; INFN, Pisa)
A scale invariant Goldstino theory coupled to Supergravity is obtained as a standard supergravity dual of a rigidly scale invariant higher--curvature Supergravity with a nilpotent chiral scalar curvature. The bosonic part of this theory describes a massless scalaron and a massive axion in a de Sitter Universe..
arXiv:1508.02939; CERN-PH-TH-2015-193.-
Geneva : CERN, 2015-09-02 - 3 p.
- Published in : Phys. Lett. B 749 (2015) 589-591
Article from SCOAP3: PDF; Fulltext: PDF; External link: Preprint
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Pre-Inflationary Relics in the CMB?
/ Gruppuso, A. (IASF, Bologna ; INFN, Bologna) ; Kitazawa, N. (Tokyo Metropolitan U.) ; Mandolesi, N. (Ferrara U. ; INFN, Ferrara ; IASF, Bologna) ; Natoli, P. (Ferrara U. ; INFN, Ferrara) ; Sagnotti, A. (CERN ; Pisa, Scuola Normale Superiore ; INFN, Pisa)
String Theory and Supergravity allow, in principle, to follow the transition of the inflaton from pre-inflationary fast roll to slow roll. This introduces an infrared depression in the primordial power spectrum that might have left an imprint in the CMB anisotropy, if it occurred at accessible wavelengths. [...]
CERN-PH-TH-2015-181; arXiv:1508.00411.-
Geneva : CERN, 2016-03 - 6 p.
- Published in : Phys. Dark Universe 11 (2016) 68-73
Preprint: PDF; External link: Preprint
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Properties of Nilpotent Supergravity
/ Dudas, E. (Ecole Polytechnique, CPHT ; DESY) ; Ferrara, S. (CERN ; Frascati ; UCLA) ; Kehagias, A. (CERN ; Natl. Tech. U., Athens) ; Sagnotti, A. (CERN ; Pisa, Scuola Normale Superiore ; INFN, Pisa)
We construct Supergravity models where the goldstino multiplet has a gravitational origin, being dual to the chiral curvature superfield. Supersymmetry is nonlinearly realized due to a nilpotent constraint, while the goldstino arises from $\gamma$-traces of the gauge-invariant gravitino field strength. [...]
arXiv:1507.07842; CERN-PH-TH-2015-174; CPHT-RR021.0615; CERN-PH-TH-2015-174.-
Geneva : CERN, 2015-09-30 - 19 p.
- Published in : JHEP 09 (2015) 217
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint
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Observational Hints of a Pre--Inflationary Scale?
/ Gruppuso, A. (Bologna Observ. ; INFN, Bologna) ; Sagnotti, A. (CERN ; Pisa, Scuola Normale Superiore ; INFN, Pisa)
We argue that the lack of power exhibited by cosmic microwave background (CMB) anisotropies at large angular scales might be linked to the onset of inflation. We highlight observational features and theoretical hints that support this view, and present a preliminary estimate of the physical scale that would underlie the phenomenon..
CERN-PH-TH-2015-147; arXiv:1506.08093; CERN-PH-TH-2015-147.-
Geneva : CERN, 2015-09-28 - 8 p.
- Published in : Int. J. Mod. Phys. D 24 (2015) 1544008
Preprint: PDF; External link: Preprint
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