37 Result(s)
within
Sergio Ferrara
Classical and Quantum Gravitation, Relativity Theory
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Article
Open AccessBimetric, conformal supergravity and its superstring embedding
We discuss the connection between Weyl2 supergravity and superstrings and further discuss holography between 4-dimensional, ...
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Article
Open AccessAspects of Weyl supergravity
In this paper we study the spectrum of all conformal, N ...
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Article
Open AccessSpin-four \( \mathcal{N}=7 \) W-supergravity: S-fold and double copy construction
In the present investigation we consider the possibility of having new massive, higher spin W-supergravity theories, which do not exist as four-dimensional perturbative models. These theories are based on a do...
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Article
Open AccessThe supercurrent and Einstein equations in the superconformal formulation
We give a new expression for the supercurrent and its conservation in curved N ...
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Article
Open AccessLinear versus non-linear supersymmetry, in general
We study superconformal and supergravity models with constrained superfields. The underlying version of such models with all unconstrained superfields and linearly realized supersymmetry is presented here, in ...
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Article
Open Accessℛ2 supergravity
We formulate R2 pure supergravity as a scale invariant theory built only in terms of superfields describing the geometry of curved superspace. The standard supergravity duals are obtained in both “old” and “new” ...
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Article
Open AccessCosmology with nilpotent superfields
We discuss N=1 supergravity inflationary models based on two chiral multi-plets, the inflaton and the goldstino superfield. Using superconformal methods for these models, we propose to replace the unconstraine...
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Article
Open AccessOn the topology of the inflaton field in minimal supergravity models
We consider global issues in minimal supergravity models where a single field inflaton potential emerges. In a particular case we reproduce the Starobinsky model and its description dual to a certain formulati...
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Chapter and Conference Paper
Constitutive Relations, Off Shell Duality Rotations and the Hypergeometric Form of Born-Infeld Theory
We review equivalent formulations of nonlinear and higher derivatives theories of electromagnetism exhibiting electric-magnetic duality rotations symmetry. We study in particular on shell and off shell formula...
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Article
Open AccessOn the supersymmetric completion of R + R 2 gravity and cosmology
We revisit and clarify the supersymmetric versions of R + R 2 gravity, in view of the renewed interest to these models in cosmology. We emphasize that the content of the dual standard supe...
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Article
Open AccessDualities near the horizon
In 4-dimensional supergravity theories, covariant under symplectic electricmagnetic duality rotations, a significant role is played by the symplectic matrix ...
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Article
Open AccessMulti-centered first order formalism
We propose a first order formalism for multi-centered black holes with flat three-dimensional base-space, within the stu model of N = 2, D = 4 ungauged MaxwellEinstein supergravity. This provides a unified descri...
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Article
Open AccessConstitutive relations and Schrödinger’s formulation of nonlinear electromagnetic theories
We present a systematic study of nonlinear and higher derivatives extensions of electromagnetism. We clarify when action functionals S[F] can be explicitly obtained from arbitrary (not necessarily self-dual) nonl...
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Article
Open Accessd-geometries revisited
We analyze some properties of the four dimensional supergravity theories which originate from five dimensions upon reduction. They generalize to N > 2 extended supersymmetries the d-geometries with cubic prepoten...
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Chapter and Conference Paper
On the Classification of Two Center Orbits for Magical Black Holes
We report on recent work [4] concerning the determination of the two-centered generic charge orbits of magical \(\mathcal{N} = 2\) and ...
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Chapter and Conference Paper
On Symmetries of Extremal Black Holes with One and Two Centers
After a brief introduction to the Attractor Mechanism, we review the appearance of groups of type \(E_{7}\) ...
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Article
Open AccessSuper-Ehlers in any dimension
We classify the enhanced helicity symmetry of the Ehlers group to extended supergravity theories in any dimension. The vanishing character of the pseudo-Riemannian cosets occurring in this analysis is explaine...
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Article
Open AccessDegeneration of groups of type E 7 and minimal coupling in supergravity
We study properties of D = 4 \( \mathcal{N} \geqslant {2} \) extended supergravities (and related compactifications of superstr...
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Article
Open AccessOn invariant structures of black hole charges
We study “minimal degree” complete bases of duality- and “horizontal”- invariant homogeneous polynomials in the flux representation of two-centered black hole solutions in two classes of D = 4 Einstein supergravi...
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Article
Open AccessCreation of matter in the universe and groups of type E7
We relate the mechanism of matter creation in the universe after inflation to a simple and universal mathematical property of extended N > 1 supergravities and related compactifications of superstring theory. We ...
