Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"critical exponent"”.
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Multiple Solutions on a Ball for a Generalized Lane Emden Equation
… equation and the interplay between the exponents involved and their consequences on the existence and non existence of radial solutions on a unit ball in n dimensions. We extend the analysis to the phase plane for a clear understanding of the behavior of solutions and the relationship …
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Core excitons in amorphous magnesium alloys
… line shape of the threshold is described by a critical exponent, and appears to be continuous between compositions having insulating conductivity and compositions approaching metallic conductivity. The exciton broadened asymmetrically toward higher energy, eventually assuming a shape similar to …
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MOMENTUM SIGNATURES OF THE ANDERSON TRANSITION
… We demonstrate how to extract properties like critical exponent, the mobility edge and signatures of multifractality from this finite-time analysis. These momentum space signatures of the Anderson transition are novel and they promise to be experimental observables for wide range of systems, …
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Maps of intervals with indifferent fixed points: thermodynamic formalism and phase transitions
… at the indifferent fixed points. We obtain the critical exponent describing the singularity of the pressure and analyse the decay of correlations of the equilibrium states at all temperatures. Our technique relies on establishing and exploiting a relationship between the transfer operators of …
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Monte Carlo computer simulation of sub-critical Lennard-Jones particles
… percolation threshold. Using scaling theory, the critical exponent, Ï , is determined from the cluster distributions. Deviation from the scaling law is evaluated using a modified scaling law that includes a surface term. It is found that the surface term is unnecessary in the gas-like area of the …
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A Transfer Matrix Approach to Studying the Entanglement Complexity of Self-Avoiding Polygons in Lattice Tubes
… the evidence supports that the entropic critical exponent goes up by one with each knot factor. Additionally, a system consisting of two SAPs (called a 2SAP) in a tube is also studied to explore linking. New transfer matrices are generated for 2SAPs in small tube sizes, and exact …
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Blow-up in a degenerate parabolic equation with gradient nonlinearity
… in case of kappa = 0 it was proved that the exponent q=p+1 is critical with respect to blow-up. In this thesis we particularly show the influence of the gradient term on this behavior of the solutions for positive or negative values of kappa. In Chapter 1 we prove that the equation mentioned …
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Non-perturbative approaches to strongly correlated electron systems
… that emerges at the orbital-ordering quantum critical point. These modes modify the single-particle density of states and lead to non-Fermi liquid behavior which can provide a possible explanation for the recently observed zero-bias enhancement in the point contact spectroscopy signal on iron …
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Superfluid Density Measurements of High-Temperature Superconducting Films
… close to the Tc, the superfluid density exhibits critical phase fluctuations described by an XY model. These phase fluctuations are compared to a model of the pseudogap described by preformed pairs. In contrast to previous reports on YBCO films, we find that the phase transition in a YBCO film is …
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Scaling limits of random plane partitions and six-vertex models
… the (long predicted) transversal 2/3 critical exponent for the height functions of the stochastic sixvertex model and asymmetric simple exclusion process (ASEP). The algebraic parts of our arguments involve the construction and use of degenerations and modifications of the Macdonald …
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Studies on two topics in theoretical physics: Entanglement entropy and holographic superconductors
… _nd the second order phase transition at certain critical temperature Tc and a mean _eld critical exponent of 0.5. The low temperature behavior of this model does not conform to that of a superconductor however. We also study the static, axially symmetric solutions (vortex solutions), especially …
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Ponto crítico quântico supercondutor em sistemas multi-bandas
… susceptibility, which allows us to find a critical hybridization above which there is no superconducting phase, determine the critical and the crossover lines and determine the dynamical critical exponent z for this system. Therefore we can predict the behavior of some quantities measured …
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The role of heterogeneity in long-range interacting systems : from nucleation to earthquake fault systems
… model by correcting the spinodal field and the critical exponent sigma describing the critical behavior of clusters in spinodal nucleation theory. The applicability of this correction is shown by simulations that determine the cluster scaling of the nucleating droplets near the spinodal. Having …
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Critical Properties of the Emergent Random Solid in Vulcanization/gelation Transition
… energy for the transition, and had analyzed the critical region within the liquid state, this Thesis focuses on the nature of fluctuations in the random solid state and the critical behavior of physical quantities detecting it. The first part of this Thesis investigates the Goldstone-type low …
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Insulator-Superconductor Transitions in Two Dimensions
… the fluctuation conductivity near the quantum critical point (QCP) in the presence of dissipation. We show that sufficiently close to the QCP, Ohmic dissipation can change the dynamical critical exponent from z = 1 to z = 2 in the quantum critical (QC) regime. In the third part we show that the …
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Holography for the practical person
… Lifshitz spacetime characterized by a dynamical critical exponent $z$. We compute the fully renormalized static Lifshitz thermodynamic potential explicitly, which confirms the forms of all thermodynamic quantities including the Bekenstein-Hawking and Smarr-like relationships. For transport, we …
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Interfacial properties of fluid phases in two dimensions and of three-component surfactant systems
… complex fluids. The first problem concerns the critical behavior of the thickness of interface of simple fluids in two dimensions of space. We study this problem using both theory and computer simulations. In our theoretical study of this problem, the equilibrium interface is assumed, in accord …
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Multiscale approaches on two-dimensional magnetic materials: from atomistic to mesoscale level
… two-dimensional magnets. To computed their critical temperature Tc, we parametrised the generalised Heisenberg model (XXZ) using DFT+U, and then we ran MC simulations. Most of the materials have a critical temperature below 100 K, but two of them, i.e. VPS3 and VSe2, may potentially show …
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An Investigation of the Magnetic and Electrical Properties of YNi3
… successful tool we have for trying to describe critical behaviour on the border of magnetism, and these materials are particularly suited to such investigations. In this thesis the magnetic and electrical properties of YNi3 have been investigated both in magnetic field and under hydrostatic …
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Properties of p-modulus on radially symmetric infinite trees
… of this dissertation is the existence of a critical p-value for certain trees. The value of p-modulus when p is above this critical value is zero, while the value of p-modulus when p is below the critical value is positive. This provides a sense of ``dimension'' for the tree. As one …
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