Zobrazeno 1 - 10
of 443
pro vyhledávání: '"Porrati, M"'
Autor:
Porrati, M., Zaffaroni, A.
In Anti de Sitter space both massive and massless high-spin particles can have consistent local interactions. Both can couple to conserved currents. In this paper we show that when the particles have spin one or greater, there exists a universal feat
Externí odkaz:
http://arxiv.org/abs/2408.16919
Autor:
Porrati, M.
This is a review of selected topics from recent work on symmetry charges in asymptotically flat spacetime done by the author in collaboration with U. Kol and R. Javadinezhad. First we reinterpret the reality constraint on the boundary graviton as the
Externí odkaz:
http://arxiv.org/abs/2010.12151
We study superstring theory in three dimensional Anti-de Sitter spacetime with NS-NS flux, focusing on the case where the radius of curvature is equal to the string length. This corresponds to the critical level k=1 in the Wess-Zumino-Witten descript
Externí odkaz:
http://arxiv.org/abs/1803.04420
Autor:
Ferrara, S., Porrati, M.
N=1, D=4 non linear sigma models, parametrized by chiral superfields, usually describe Kaehlerian geometries, provided that Einstein frame supergravity is used. The sigma model metric is no longer Kaehler when local supersymmetry becomes nonlinearly
Externí odkaz:
http://arxiv.org/abs/1707.09273
We describe minimal supergravity models where supersymmetry is non-linearly realized via constrained superfields. We show that the resulting actions differ from the so called "de Sitter" supergravities because we consider constraints eliminating dire
Externí odkaz:
http://arxiv.org/abs/1611.01490
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 m
Externí odkaz:
http://arxiv.org/abs/1508.02939
We investigate $U(1)^{\,n}$ supersymmetric Born-Infeld Lagrangians with a second non-linearly realized supersymmetry. The resulting non-linear structure is more complex than the square root present in the standard Born-Infeld action, and nonetheless
Externí odkaz:
http://arxiv.org/abs/1412.3337
We derive new types of $U(1)^n$ Born-Infeld actions based on N=2 special geometry in four dimensions. As in the single vector multiplet (n=1) case, the non--linear actions originate, in a particular limit, from quadratic expressions in the Maxwell fi
Externí odkaz:
http://arxiv.org/abs/1411.4954
Autor:
Ferrara, S., Porrati, M.
The supersymmetric extension of "Starobinsky" $R+\alpha R^2$ models of inflation is particularly simple in the "new minimal" formalism of supergravity, where the inflaton has no scalar superpartners. This paper is devoted to matter couplings in such
Externí odkaz:
http://arxiv.org/abs/1407.6164
Autor:
Porrati, M.
We review model independent arguments showing that massless particles interacting with gravity in a Minkowski background space can have at most spin two. These arguments include a classic theorem due to Weinberg, as well as a more recent extension of
Externí odkaz:
http://arxiv.org/abs/1209.4876