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Dive into the research topics where Leopoldo A. Pando Zayas is active.

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Featured researches published by Leopoldo A. Pando Zayas.


Journal of High Energy Physics | 2002

On Penrose limits and gauge Theories

Leopoldo A. Pando Zayas; Jacob Sonnenschein

We discuss various Penrose limits of conformal and nonconformal backgrounds. InAdS5£T 1;1 , for a particular choice of the angular coordinate inT 1;1 the resulting Penrose limit coincides with the similar limit forAdS5£S 5 . In this case an identiflcation of a subset of fleld theory operators with the string zero mode creation operators is possible. For another limit we obtain a light-cone string action that resembles a particle in a magnetic fleld. We also consider three difierent types of backgrounds that are dual to nonconformal fleld theories: The Schwarzschild black hole in AdS5, D3-branes on the small resolution of the conifold and the Klebanov-Tseytlin background. We flnd that in all three cases the introduction of nonconformality renders a theory that is no longer exactly solvable and that the form of the deformation is universal. The corresponding world sheet theory in the light-cone gauge has a ? = x + dependent mass term.


Journal of High Energy Physics | 2013

Entanglement temperature and entanglement entropy of excited states

Gabriel Wong; Israel Klich; Leopoldo A. Pando Zayas; Diana Vaman

A bstractWe derive a general relation between the ground state entanglement Hamiltonian and the physical stress tensor within the path integral formalism. For spherical entangling surfaces in a CFT, we reproduce the local ground state entanglement Hamiltonian derived by Casini, Huerta and Myers. The resulting reduced density matrix can be characterized by a spatially varying “entanglement temperature”. Using the entanglement Hamiltonian, we calculate the first order change in the entanglement entropy due to changes in conserved charges of the ground state, and find a local first law-like relation for the entanglement entropy. Our approach provides a field theory derivation and generalization of recent results obtained by holographic techniques. However, we note a discrepancy between our field theoretically derived results for the entanglement entropy of excited states with a non-uniform energy density and current holographic results in the literature. Finally, we give a CFT derivation of a set of constraint equations obeyed by the entanglement entropy of excited states in any dimension. Previously, these equations were derived in the context of holography.


Journal of High Energy Physics | 2005

Holographic duals of flavored N = 1 super Yang-Mills: beyond the probe approximation

Benjamin A. Burrington; James T. Liu; Leopoldo A. Pando Zayas; Diana Vaman

We construct backreacted D3/D7 supergravity backgrounds which are dual to four-dimensional N = 1 and N = 2 supersymmetric Yang-Mills at large Nc with ∞avor quarks in the fundamental representation of SU(Nc). We take into account the backreaction of D7-branes on either AdS5£S 5 or AdS5£T 1;1 , or more generically on backgrounds where the space transverse to the D3-branes is Kahler. The construction of the backreacted geometry splits into two stages. First we determine the modiflcation of the six-dimensional space transverse to the D3 due to the D7, and then we compute the warp factor due to the D3. TheN = 2 background corresponds to placing a single stack of Nf D7-branes in AdS5£S 5 . Here the Kahler potential is known exactly, while the warp factor is obtained in certain limits as a perturbative expansion. By placing another D7 0 probe in the backreacted D3/D7 background, we derive the efiect of the D7-branes on the spectrum of the scalar ∞uctuations to flrst order in Nf. The two systems with N = 1 supersymmetry that we discuss are D3/D7/D7 0 and D3/D7 on the conifold. In both cases, the Kahler potential is obtained perturbatively in the number of D7-branes. We provide all the ingredients necessary for the computation of each term in the expansion, and in each case give the flrst few terms explicitly. Finally, we comment on some aspects of the dual gauge theories.


Journal of High Energy Physics | 2005

Regge trajectories for mesons in the holographic dual of large-N(c) QCD

Martin Kruczenski; Leopoldo A. Pando Zayas; Jacob Sonnenschein; Diana Vaman

We discuss Regge trajectories of dynamical mesons in large-Nc QCD, using the supergravity background describing Nc D4-branes compactified on a thermal circle. The flavor degrees of freedom arise from the addition of Nf << Nc D6 probe branes. Our work provides a string theoretical derivation, via the gauge/string correspondence, of a phenomenological model describing the meson as rotating point-like massive particles connected by a flux string. The massive endpoints induce nonlinearities for the Regge trajectory. For light quarks the Regge trajectories of mesons are essentially linear. For massive quarks our trajectories qualitatively capture the nonlinearity detected in lattice calculations.


Journal of High Energy Physics | 2001

Non-Extremal Gravity Duals for Fractional D3-Branes on the Conifold

Alex Buchel; Igor R. Klebanov; Christopher P. Herzog; Leopoldo A. Pando Zayas; Arkady A. Tseytlin

The world volume theory on N regular and M fractional D3-branes at the conifold singularity is a non-conformal N = 1 supersymmetric SU(N+ M) SU(N) gauge theory. In previous work the extremal Type IIB supergravity dual of this theory at zero temperature was constructed. Regularity of the solution requires a deformation of the conifold: this is a reflection of the chiral symmetry breaking. To study the non-zero temperature generalizations non-extremal solutions have to beconsidered, andinthehightemperaturephasethechiralsymmetryisexpectedto berestored. SuchasolutionisexpectedtohavearegularSchwarzschild horizon. We construct an ansatz necessary to study such non-extremal solutions and show that thesimplest possiblesolutionhasasingularhorizon. Wederivethesystemofsecond order equations in the radial variable whose solutions may have regular horizons.


Physical Review D | 2011

Rapid thermalization in field theory from gravitational collapse

David Garfinkle; Leopoldo A. Pando Zayas

Motivated by the duality with thermalization in field theory, we study gravitational collapse of a minimally coupled massless scalar field in Einstein gravity with a negative cosmological constant. We investigate the system numerically and establish that for small values of the initial amplitude of the scalar field there is no black hole formation, rather, the scalar field performs an oscillatory motion typical of geodesics in AdS. For large enough values of the amplitude of the scalar field we find black hole formation which we detect numerically as the emergence of an apparent horizon. Using the time of formation as an estimate for thermalization in the field theory we conclude that thermalization occurs very rapidly, close to the causal bound for a very wide range of black hole masses. We further study the thermalization time in more detail as a function of the amplitude and the width of the initial Gaussian scalar field profile and detect a rather mild structure.


Nuclear Physics | 2004

Regge trajectories revisited in the gauge / string correspondence

Leopoldo A. Pando Zayas; Jacob Sonnenschein; Diana Vaman

Abstract We attempt to obtain realistic glueball Regge trajectories from the gauge/string correspondence. To this end we study closed spinning string configurations in two supergravity backgrounds: Klebanov–Strassler (KS) and Maldacena–Nunez (MN) which are dual to confining gauge theories. These backgrounds represent two embeddings of N =1 SYM, in the large rank N limit, in string theory. The classical configuration that we consider is that of a folded closed string spinning in a supergravity region with vanishing transverse radius (τ=0) which is dual to the IR of the gauge theory. Classically, a spinning string yields a linear Regge trajectory with zero intercept. By performing a semi-classical analysis we find that quantum effects alter both the linearity of the trajectory and the vanishing classical intercept: J≡α(t)=α 0 +α′t+β t . Two features of our Regge trajectories are compatible with the experimental pomeron trajectory: positive intercept and positive curvature. The fact that both KS and MN string backgrounds give the same functional expression of the Regge trajectories suggests that in fact we are observing string states dual to N =1 SYM.


Journal of High Energy Physics | 2012

On field theory thermalization from gravitational collapse

David Garfinkle; Leopoldo A. Pando Zayas; Dori Reichmann

A bstractMotivated by its field theory interpretation, we study gravitational collapse of a minimally coupled massless scalar field in Einstein gravity with a negative cosmological constant. After demonstrating the accuracy of the numerical algorithm for the questions we are interested in, we investigate various aspects of the apparent horizon formation. In particular, we study the time and radius of the apparent horizon formed as functions of the initial Gaussian profile for the scalar field. We comment on several aspects of the dual field theory picture.


Physical Review D | 2008

On a Holographic Model for Confinement/Deconfinement

C. A. Ballon Bayona; Henrique Boschi-Filho; Nelson R. F. Braga; Leopoldo A. Pando Zayas

We study the thermodynamics of the hard wall model, which consists of the introduction of an infrared cutoff in asymptotically AdS spaces. This is a toy model for confining backgrounds in the context of the gauge/gravity correspondence. We use holographic renormalization and reproduce the existence of a Hawking-Page phase transition recently discussed by Herzog. We also show that the entropy jumps from


Journal of High Energy Physics | 2006

Supersymmetric branes on AdS5 × Yp,q and their field theory duals

Felipe Canoura; Jose D. Edelstein; Leopoldo A. Pando Zayas; Alfonso V. Ramallo; Diana Vaman

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Guillermo A. Silva

National Scientific and Technical Research Council

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