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Let M(A) denote the comparison matrix of a square H-matrix A, that is, M(A) is an M-matrix. Hmatrices such that their comparison matrices are non-singular are well studied in the literature. In this paper, we study characterizations of H-matrices with either singular or non-singular comparison matrices. The spectral radius of the Jacobi matrix of M(A) andâ€¦ (More)

Following the nonperturbative prescription for the jet quenching parameter recently proposed by Liu, Rajagopal and Wiedemann, we compute the first correction in the inverse â€˜t Hooft coupling corresponding to string Î± corrections in the dual background. We also consider the introduction of a chemical potential for the U(1) gauged R-symmetry. While the formerâ€¦ (More)

- JosÃ© D. Edelstein, Marta GÃ³mezâ€“Reino, Marcos MariÃ±o, Javier Mas
- 1999

We embed the Seibergâ€“Witten solution for the low energy dynamics of N = 2 super Yangâ€“Mills theory with an even number of massive hypermultiplets into the Whitham hierarchy. Expressions for the first and second derivatives of the prepotential in terms of the Riemann theta function are provided which extend previous results by Gorsky, Marshakov, Mironov andâ€¦ (More)

- Javier Mas, Javier TarÅ•Ä±o
- 2007

We complete the computation of viscous transport coefficients in the near horizon geometries that arise from a stack of black Dp-branes for p = 2, ..., 6 in the decoupling limit. The main new result is the obtention of the bulk viscosity which, for all p, is found to be related to the speed of sound by the simple relation Î¶/Î· = âˆ’2(v2 s âˆ’ 1p). Forâ€¦ (More)

We study N = 2 super Yang-Mills theory with gauge group SU(N) from the point of view of the Whitham hierarchy. We develop a new recursive method to compute the whole instanton expansion of the prepotential using the theta function associated to the root lattice of the group. Explicit results for the one and two-instanton corrections in SU(N) are presented.â€¦ (More)

- Javier Mas, Jonathan P. Shock, Javier TarÅ•Ä±o, Dimitrios Zoakos
- 2008

Using the AdS/CFT correspondence, we compute the spectral functions of thermal super Yang Mills at large Nc coupled to a small number of flavours of fundamental matter, Nf Nc, in the presence of a nonzero baryon density. The holographic dual of such a theory involves the addition of probe D7-branes with a background worldvolume gauge field switched on,â€¦ (More)

- Javier Mas, Jonathan P. Shockand, Javier TarÅ•Ä±o
- 2009

We study the holographic D3/D7 setup dual to N = 4 supersymmetric Yang-Mills with quenched fundamental matter. We extend the previous analyses of conductivity and photoproduction to the case where there is a finite electric field. Due to the electric field a special region in the D7-brane geometry, labelled the singular shell, appears generically, and theâ€¦ (More)

- Javier Mas
- 2006

We compute the shear viscosity in the supersymmetric Yang-Mills theory dual to the STU background. This is an example of thermal gauge theory with a nonzero chemical potential. The quotient of the shear viscosity over the entropy density exhibits no deviation from the well known result Î·/s = 1/4Ï€.

We compute the shear viscosity of the non-commutative N=4 super Yang-Mills quantum field theory at strong coupling using the dual supergravity background. Special interest derives from the fact that the background presents an intrinsic anisotropy in space through the distinction of commutative and non-commutative directions. Despite this anisotropy theâ€¦ (More)

- JosÃ© M. Figueroa-Oâ€™Farrill, Javier Mas, Eduardo Ramos
- 1992

The KP hierarchy is hamiltonian relative to a one-parameter family of Poisson structures obtained from a generalized Adler map in the space of formal pseudodifferential symbols with noninteger powers. The resulting W-algebra is a one-parameter deformation of WKP admitting a central extension for generic values of the parameter, reducing naturally to Wn forâ€¦ (More)