55242680
Holographic quantum criticality and strange metal transport
A holographic model of a quantum critical theory at a finite but low temperature and a finite density is studied. The model exhibits non-relativistic z = 2 Schr¨ odinger symmetry and is realized by the anti- de-Sitter-Schwarzschild black hole in light-cone coordinates. Our approach addresses the electrical conductivities in the presence or absence of an applied magnetic field and contains a control parameter that can be associated with quantum tuning via charge carrier doping or an external field in correlated electron systems. The Ohmic resistivity, the inverse Hall angle, the Hall coefficient and magnetoresistance are shown to be in good agreement with experimental results of strange metals at very low temperature. The holographic model also predicts new scaling relations in the presence of a magnetic field.
118345696
Hyperscaling violation: a unified frame for effective holographic theories
A bstractWe investigate systematic classifications of low energy and lower dimensional effective holographic theories with Lifshitz and Schrödinger scaling symmetries only using metrics in terms of hyperscaling violation (θ) and dynamical (z) exponents. Their consistent parameter spaces are constrained by null energy and positive specific heat conditions, whose validity is explicitly checked against a previously known result. From dimensional reductions of many microscopic string solutions, we observe the classifications are tied with the number of scales in the original microscopic theories. Conformal theories do not generate a nontrivial θ for a simple sphere reduction. Theories with Lifshitz scaling with one scale are completely fixed by θ and z, and have a universal emblackening factor at finite temperature. Dimensional reduction of intersecting M2-M5 requires, we call, spatial anisotropic exponents (#), along with z = 1, θ = 0, because of another scale. Theories with Schrödinger scaling show similar simple classifications at zero temperature, while require more care due to an additional parameter being a thermodynamic variable at finite temperature.
118450242
Charged Dilatonic Black Holes and their Transport Properties
Crete Center for Theoretical Physics, Department of Physics, University of Crete, 71003 Heraklion, GreeceKey words Dilatonic Black Holes, Transport Properties, Effective Holographic Theories.We brieﬂy explain the consistency conditions imposed on the effective holographic theories, which are pa-rameterized by two real exponents (γ,δ)that control the IR dynamics. The general scaling of DC resistivitywith temperature at low temperature and AC conductivity at low frequency across the whole (γ,δ)planeare explained. There is a codimension-one region where the DC resistivity is linear in the temperature. Formassive carriers, it is shown that when the scalar operator is not the dilaton, the DC resistivity scales as theheat capacity (and entropy) for (2+1)-dimensional systems. Regions are identiﬁed where the theory atﬁnite density is a Mott-like insulator. This contribution is based on [C. Charmousis, et al. JHEP 1011, 151(2010)] [1] with emphasis on the transport properties of charged dilatonic black holes with potential.
15669145
Aspects of Puff Field Theory
We describe some features of the recently constructed ``Puff Field Theory,'' and present arguments in favor of it being a field theory decoupled from gravity. We construct its supergravity dual and calculate the entropy of this theory in the limit of large 't Hooft coupling. We also determine the leading irrelevant operator that governs its deviation from = 4 super Yang-Mills theory.
119213544
Aging logarithmic conformal field theory: a holographic view
A bstractWe consider logarithmic extensions of the correlation and response functions of scalar operators for the systems with aging as well as Schrödinger symmetry. Aging is known to be the simplest nonequilibrium phenomena, and its physical significances can be understood by the two-time correlation and response functions. Their logarithmic part is completely fixed by the bulk geometry in terms of the conformal weight of the dual operator and the dual particle number.Motivated by recent experimental realizations of Kardar-Parisi-Zhang universality class in growth phenomena and its subsequent theoretical extension to aging, we investigate our two-time correlation functions out of equilibrium, which show several qualitatively different behaviors depending on the parameters in our theory. They exhibit either growing or aging, i.e. power-law decaying, behaviors for the entire range of our scaling time. Surprisingly, for some parameter ranges, they exhibit growing at early times as well as aging at later times.
1358039
Vortex Solutions of Nonrelativistic Fermion and Scalar Maxwell-Chern-Simons Theories
We have constructed nonrelativistic fermion and scalar field theories coupled to a Maxwell-Chern-Simons gauge field which admit static multi-vortex solutions. This is achieved by introducing a magnetic coupling term in addition to the usual minimal coupling. e-mail : bskim@theory.yonsei.ac.kr e-mail : hjlee@theory.yonsei.ac.kr e-mail : jhyee@phya.yonsei.ac.kr
117807581
J/$\psi$ suppression with respect to the reaction plane in Au+Au collisions at $\sqrt{s}$=200 GeV by the PHENIX detector