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Showing 1 to 20 of 41 for “"effective action"”.
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Boundary conditions, effective action, and Virasoro algebra for AdS₃
We construct an effective action of General Relativity for small excitations from asymptotic transformations and use it to study conformal symmetry in the boundary of AdS3. By requiring finiteness of the boundary effective action(s) for certain asymptotic transformations, we derive the well known …
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Effective action approach to quantum phase transitions in bosonic lattices
… field is introduced, and the underlying effective action is derived via a Legendre transformation. After determining the Ginzburg-Landau expansion of the effective action to first order in the tunneling term. expressions for the Mott insulator-superfluid phase boundary, condensate …
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TOPICS IN QUANTUM FIELD THEORY
<p>A gauge invariant action functional for non-abelian gauge theories is derived from the vacuum to vacuum transition amplitude. This effective action is then examined in the loop expansion, where it is demonstrated that the unrenormalized one-loop term is equal to the change in the zero point …
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Quantum Statistical Physics of a Microscopic Glass Model
… approximations using the replica method and effective action methods from quantum field theory. We recover results from a semiclassical treatment and find relations to quantum spherical p-spin models.
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Low energy effective actions and tachyon dynamics from string field theory
… we show how to calculate off-shell low energy effective actions and how to study the dynamics of the tachyon from string field theory. We discuss how to obtain an effective action for the massless field and we explain how to relate it to well known results. We then study the tachyon dynamics …
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Effective Actions for Strongly Interacting Fermionic Systems
… non-perturbative methods for calculating the effective action for fermionic systems featuring bosonic bound states (BBS) and spontaneous symmetry breaking (SSB). In a purely fermionic language proceeding into the SSB phase requires techniques beyond perturbation theory and renormalization …
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Lattice QCD determination of weak decays of B mesons
… the procedure of gauge fixing, the quantum effective action and background field gauge which is required for subsequent perturbative work. Details of the basic methodology of lattice quantum field theory are given as well as the specific formulation of the relativistic theory and …
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D-branes and string field theory
… We compute first few terms the low energy effective action for the non-abelian gauge field A, from Witten's action. We show that after the appropriate field redefinition which relates the string field theory variables to the worldsheet variables one obtains the correct Born-Infeld terms. We …
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Some Topological Aspects of Condensed Matter Physics
… pair. The problem is also studied using an effective Action approach. Edge currents in a quantum spin Hall model in graphene are also studied using similar techniques. A model for the integer quantum Hall effect on a square lattice is presented. Using techniques from algebraic topology, a …
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Spectral functions for generalized piston configurations.
… we obtain the Casimir force and the one-loop effective action for these systems as the values at s= -½ and the derivative at s = 0. Information about the heat kernel coefficients can also be found in the spectral zeta function in the form of residues, which provide an indirect way of finding …
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Orbit maps of local S¹- actions on manifolds of dimension less than five
<p>A local S<sup>1</sup>-action on a topological space X is a decomposition of X into points and simple closed curves such that each element of the decomposition has an invariant neighborhood admitting an effective action of S<sup>1</sup> whose orbits are elements of the decomposition. Let M be a …
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Die Methode der nichtlokalen effektiven Wirkung in höherdimensionalen Raumzeitmodellen
… branes. For this model the nonlocal braneworld action is <br>constructed in a holographic setup alternative to Kaluza-Klein description: <br>the action is written as a functional of the two metric and radion fields on <br>the branes. This action effectively describes the dynamics of the …
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Aspects of Quantum Fluctuations under Time-dependent External Influences
… will study the accuracy of a finite-range interaction potential onto such an expansion. Exploiting the universality of quantum fluctuations, several aspects of cosmic inflation will be identified in ballistically expanding Bose-Einstein condensates. The effective action technique for calculating …
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Causal and stable stochastic relativistic hydrodynamics
… results to the nonlinear regime, we consider effective action approaches. The standard procedures can lead to a non-convergent path integral and non-positive definite noise, so we introduce a new effective theory based on Crooks fluctuation theorem. This effective theory is applied to …
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Electromagnetic response of time-reversal breaking metallic phases in two dimensions
… in the symmetric phase directly to achieve an effective action. Finally, the full response polarization tensor is derived and its Ward identity is shown to be obeyed.
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Lowest Landau level field theory for the fractional quantum Hall effect
… on its relevance to the physics of the fractional quantum Hall effect. For excitation energies much smaller than the cyclotron gap the states can be described in terms of their lowest Landau level content, neglecting the possible mixing between Landau levels induced by the potential terms. …
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The e ect of mobile BI on organisational managerial decision-making
… and transformed into knowledge in order to take effective action. Mobility in business is increasingly exercising influence on core business processes of organisations. The shift to wireless technologies coupled with the rapid growth of mobile devices in business has led to a new era in business …
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Towards Sustainable Plastic Waste Management in Tuvalu
… institutional responsibilities undermine effective action. Although many residents' express willingness to reduce plastic use, this is often constrained by cost, lack of alternatives, and weak policy enforcement. Regional initiatives led by SPREP, such as Pacific Waste Management …
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Towards Sustainable Plastic Waste Management in Tuvalu
… institutional responsibilities undermine effective action. Although many residents' express willingness to reduce plastic use, this is often constrained by cost, lack of alternatives, and weak policy enforcement. Regional initiatives led by SPREP, such as Pacific Waste Management …
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Paradoxes of hybrid organizing in the Cambridge Energy Alliance by Jason Jesurum Jay.
… conditions under which hybrid organizations are effective in realizing such solutions, along with the processes that strengthen or dissipate their distinctive capabilities. Building upon an in-depth field study of the public-private Cambridge Energy Alliance and its network of exchange partners, …
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