Browsing by Author "Benini, Francesco"

Now showing 1 - 7 of 7
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    Backreacting Flavors in the Klebanov-Strassler Background
    (2007-09-17T07:39:50Z) Benini, Francesco; Canoura, Felipe; Cremonesi, Stefano; Nunez, Carlos; Ramallo, Alfonso V.; Physics; Elementary Particle Theory
    n this paper we present new analytic solutions of pure Type IIB supergravity plus D7-branes describing the addition of an arbitrary number of flavors to the Klebanov-Tseytlin and Klebanov-Strassler backgrounds. We provide a precise field theory dual and a detailed analysis of the duality cascade which describes its RG flow. Matchings of beta functions and anomalies between the field theory and the string setup are presented. We give an understanding of Seiberg duality as a large gauge transformation on the RR and NSNS potentials. We also analyze the UV behavior of the field theory, that as suggested by the string background can be associated with a duality wall.
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    Fixing Moduli in Exact Type IIA Flux Vacua
    (2006-09-07T10:55:18Z) Acharya, Bobby Samir; Benini, Francesco; Valandro, Roberto; Physics; Elementary Particle Theory
    Type IIA flux compactifications with O6-planes have been argued from a four dimensional effective theory point of view to admit stable, moduli free solutions. We discuss in detail the ten dimensional description of such vacua and present exact solutions in the case when the O6-charge is smoothly distributed. In the localised case, the solution is a half-flat, non-Calabi-Yau metric. Finally, using the ten dimensional description we show how all moduli are stabilised and reproduce precisely the results of de Wolfe et al.
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    Fixing moduli in exact Type IIA flux vacua
    (2007-03-02T12:40:37Z) Benini, Francesco; Physics; Elementary Particle Theory
    Type IIA flux compactifications with O6-planes have been argued from a four dimensional effective theory point of view to admit stable, moduli free solutions. We discuss in detail the ten dimensional description of such vacua and present exact supersymmetric solutions in the case when the O6-charge is smoothly distributed: the geometry is Calabi-Yau and the dilaton is constant. In the localized case, the solution is a half-flat, non-Calabi-Yau metric but still with constant dilaton. Finally, using the ten dimensional description we show how all moduli are stabilized and reproduce precisely the results of de Wolfe et al. Based on arXiv:hep-th/0607223.
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    Superconformal index of low-rank gauge theories via the Bethe Ansatz
    (2021) Benini, Francesco; Rizzi, Giovanni; physics
    We study the Bethe Ansatz formula for the superconformal index, in the case of 4d N = 4 super-Yang-Mills with gauge group SU(N). We observe that not all solutions to the Bethe Ansatz Equations (BAEs) contribute to the index, and thus formulate “reduced BAEs” such that all and only their solutions contribute. We then propose, sharpening a conjecture of Arabi Ardehali et al. [1], that there is a one-to-one correspondence between solutions to the reduced BAEs and vacua of the 4d N = 1∗theory on S1. We test the proposal in the case of SU(2) and SU(3). In the case of SU(3), we confirm that there is a continuous family of solutions, whose contribution to the index is non-vanishing.
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    Superconformal indices at large N and the entropy of AdS5 × SE5 black holes
    (SISSA, 2020-05) Benini, Francesco; Colombo, Edoardo; Soltani, Saman; Zaffaroni, Alberto; Zhang, Ziruo
    The large N limit of the four-dimensional superconformal index was computed and successfully compared to the entropy of a class of AdS5 black holes only in the particular case of equal angular momenta. Using the Bethe Ansatz formulation, we compute the index at large N with arbitrary chemical potentials for all charges and angular momenta, for general N = 1 four-dimensional conformal theories with a holographic dual. We con-jecture and bring some evidence that a particular universal contribution to the sum over Bethe vacua dominates the index at large N. For N = 4 SYM, this contribution correctly leads to the entropy of BPS Kerr-Newman black holes in AdS5 × S5 for arbitrary values of the conserved charges, thus completing the microscopic derivation of their microstates. We also consider theories dual to AdS5 × SE5, where SE5 is a Sasaki-Einstein manifold. We first check our results against the so-called universal black hole. We then explicitly construct the near-horizon geometry of BPS Kerr-Newman black holes in AdS5 × T 1,1, charged under the baryonic symmetry of the conifold theory and with equal angular mo-menta. We compute the entropy of these black holes using the attractor mechanism and we find complete agreement with the field theory predictions.
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    Unquenched Flavors in the Klebanov-Witten Model
    (2007-08-30T12:05:53Z) Benini, Francesco; Canoura, Felipe; Cremonesi, Stefano; Nunez, Carlos; Ramallo, Alfonso V.; Physics; Elementary Particle Theory
    Using AdS/CFT, we study the addition of an arbitrary number of backreacting flavors to the Klebanov-Witten theory, making many checks of consistency between our new Type IIB plus branes solution and expectations from field theory. We study generalizations of our method for adding flavors to all N=1 SCFTs that can be realized on D3-branes at the tip of a Calabi-Yau cone. Also, general guidelines suitable for the addition of massive flavor branes are developed.
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    Warped Models in String Theory
    (2007-01-31T13:53:07Z) Acharya, Bobby Samir; Benini, Francesco; Valandro, Roberto; Physics; Elementary Particle Theory
    Warped models, originating with the ideas of Randall and Sundrum, provide a fascinating extension of the standard model with interesting consequences for the LHC. We investigate in detail how string theory realises such models, with emphasis on fermion localisation and the computation of Yukawa couplings. We find, in contrast to the 5d models, that fermions can be localised anywhere in the extra dimension, and that there are new mechanisms to generate exponential hierarchies amongst the Yukawa couplings. We also suggest a way to distinguish these string theory models with data from the LHC.