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Showing 1 to 20 of 27 for “"effective potential"”.

  1. Theoretical and Computational Aspects of the Optimized Effective Potential Approach within Density Functional Theory

    Heaton-Burgess, Tim2009

    … functionals through the optimized effective potential (OEP) approach, as well as extending the potential functional formalism that provides the formal basis for the OEP approach to systems in the presence of noncollinear magnetic fields.</p><p>The self-consistent implementation of …

    duke Repository record

  2. ΜΗΧΑΝΙΣΜΟΣ HIGGS ΓΙΑ ΑΒΕΛΙΑΝΕΣ ΘΕΩΡΙΕΣ ΒΑΘΜΙΔΑΣ ΣΕ ΧΩΡΟΧΡΟΝΙΚΟ ΠΛΕΓΜΑ

    Koutsoumbas, George, Κουτσούμπας, ΓιώργοςNational Technical University of Athens (NTUA)1987

    … MECHANISM IS SEEN TO OPERATE. THE EFFECTIVE POTENTIAL IS CALCULATED BY COUPLING THE SYSTEM TO EXTERNAL CURRENTS. IN THE HIGGS PHASE THERE EXISTS A REGION OF VALUES OF THE SCOLAR FIELD, WHERE THE EFFECTIVE POTENTIAL CANNOT BE DEFINED. A NEW TYPE OF EFFECTIVE POTENTIAL IS PROPOSED AND …

    greece Repository record

  3. Aspects of String Compactification

    Ren, Guoqin

    … and discussing the cosmology solutions given the effective potential obtained from string theory. We first discuss compactification of type IIB string theory in the presence of flux. With the moduli stabilized, we obtain the effective potential in the large volume limit. We then focus on getting …

    unh-thes Repository record

  4. Localization, escape rate and delocalization in kinked ratchet potentials

    Choi, Sang HyunMassachusetts Institute of Technology2015

    The particle localization in ratchet potentials with segments of reverse directions, or kinked ratchets, is computationally studied. Kinks localize a particle on on-off pulsating ratchet potentials, forming stable points in the effective potential. Analogous Kramers rate for transition between …

    mit Repository record

  5. A study of the Gribov-Zwanziger framework: from propagators to glueballs

    Vandersickel, NeleGhent University. Faculty of Sciences2011

    This thesis presents a study of the Gribov-Zwanziger framework: from propagators to glueballs. The chapters 2 and 3 are meant as an introduction and only require a basic knowledge of quantum field theory. Chapter 2 explains the techniques behind algebraic renormalization, which shall be widely used …

    ghent Repository record

  6. Adaptive Control Combined with Integral Concurrent Learning for Trajectory Tracking Near Asteroids

    Diaz Rodrigo, Alvaro2026

    … body-fixed frames, introducing the concept of effective potential. Equilibrium points are then computed from this effective potential, and their stability is assessed via Lyapunov’s direct method. To fully understand the dynamics in the vicinity of these bodies, zero-velocity curves are …

    embry-riddle Repository record

  7. Identification of potential antibiofilm hit compounds from two African natural product database against multi-drug resistant staphylococcus aureus: an in silico study

    Ilori, Tosin LydiaUniversity of the Western Cape2023

    … for drug discovery. This study seeks to identify effective potential antibiofilm compounds from a query dataset compiled from two African natural product databases (SANCDb and AfroDb). A database of known antibiofilm compounds was created from ChEMBL, PubChem, and other related databases while a …

    western-cape Repository record

  8. Heat capacity of dilute solutions of liquid He[superscript 3] in He[superscript 4] at low temperatures

    Roach, William Ronald2011

    … Bardeen, Baym j and Pines used to determine an,effective potential v(q) between He 3 quasiparticles from later data on the magnetic properties of these solutions, was used to estimate the low temperature contribution of the He 3 quasipartic1es to the thermal conductivity and viscosity of dilute …

    uiuc Repository record

  9. Fermionic superfluids : from cold atoms to high density QCD : gapless (breached pair) superfluidity and kaon condensation

    Forbes, Michael McNeilMassachusetts Institute of Technology2005

    … Pair) superfluidity, and include a summary of potential experimental realizations. We also present numerical results for a completely self-consistent approximation to the NJL model of high-density QCD and use these results to demonstrate a microscopic realization of kaon condensation. We …

    mit Repository record

  10. Chiral Rings of Two-dimensional Field Theories with (0,2) Supersymmetry

    Guo, JiruiVirginia Tech2017

    … ring structure is derived from the one-loop effective potential. Supersymmetric localization is also applicable in this case, which proves to be efficient in computing A/2 correlation functions. We then compute chiral operators in general (0,2) nonlinear sigma models, and apply them to the …

    vt Repository record

  11. String field theory and tachyon dynamics

    Yang, Haitang, Ph. D. Massachusetts Institute of TechnologyMassachusetts Institute of Technology2006

    … level expansion. We check the vanishing of the effective potential for a. In the level expansion the quartic terms generated by the cubic interactions must be canceled by the elementary quartic interaction of four marginal operators. We confirm this prediction, thus giving evidence that the …

    mit Repository record

  12. 'Variational' optimization in quantum field theory

    Mattingly, Alan CharlesRice University1993

    … we discuss variational calculations of the effective potential that go beyond the Gaussian approximation. Trial wavefunctionals are constructed by applying a unitary operator $U = e\sp{-is\pi\sb{R}\phi\sbsp{T}{2}}$ to a Gaussian state. We calculate the expectation value of the Hamiltonian …

    rice Repository record

  13. Selected Topics on Molecular Electronics, Magnetism and Surface Science

    García Suárez, Víctor Manuel2005

    … non-interacting set of particles in an effective potential. These simplifications allow us to perform accurate and fast simulations of the ground state physical properties of crystalline solids and isolated systems with a relatively large number of atoms. Such simulations are known as ab …

    oviedo Repository record

  14. Monte Carlo Simulation of Silicon Devices Including Quantum Correction and Strain

    Winstead, Brian AndrewUniversity of Illinois at Urbana-Champaign2015

    … based on the Wigner transport equation and the effective potential is performed, and the Wigner-based method is extended for use in MOS systems with an empirical model. Additionally, a new Monte Carlo quantum correction method is proposed based on the Schrodinger equation, and recommendations …

    uiuc Repository record

  15. Tachyon condensation in string field theory

    Moeller, Nicolas, 1975-Massachusetts Institute of Technology2003

    … the local minimum of the open bosonic tachyon effective potential is equal to the tension of a space-filling D-brane (Sen's first conjecture). Our results prove this equality within a precision of about 0.1%. We then construct lump solutions of open bosonic string field theory, which are …

    mit Repository record

  16. Numerical calculations of the decay rate of a false vacuum for a modified quartic potential

    Johnson, Harold J., M.A.The University of Texas at Austin2023

    … energy densities is a common feature of many potentials. The classical state is in stable equilibrium at any of these minima but is made unstable by quantum effects. The formalism that describes transitions from a false (higher energy density) vacuum to a true (lowest energy density) vacuum …

    texas Repository record

  17. Aspects of finite temperature field theories in Ads/CFT

    Brigante, MauroMassachusetts Institute of Technology2008

    … scaling limits. This allows one to extract the effective potential for the thermal scalar. For a string theory in an asymptotic anti-de Sitter (AdS) space time, the same behavior should arise from the boundary YangMills theory. Introducing "vortex" contributions for the boundary theory at finite …

    mit Repository record

  18. A Study on Heterotic Target Space Duality – Bundle Stability/Holomorphy, F-theory and LG Spectra

    Feng, HeVirginia Tech2019

    … studied at the level of counting states in the effective theories. We extend this analysis in several ways. First, we consider the correspondence including the effective potential and loci of enhanced symmetry in dual theories. By engineering vector bundles with non-trivial constraints arising …

    vt Repository record

  19. Models of Dust and Gas Tori in Active Galactic Nuclei

    Schartmann, MarcUniversität Heidelberg

    … losses. In the vicinity of the minimum of the effective potential (caused by gravity of the nuclear stellar cluster and black hole, as well as rotation of the gas), a turbulent disk forms, surrounded by a less dense clumpy and filamentary toroidal structure. Subsequent radiative transfer …

    heid-diss Repository record

  20. Orbital-free density functional theory using higher-order finite differences

    Ghosh, Swarnava GhoshGeorgia Institute of Technology2015

    … of non-interacting electrons moving in an effective potential. Even with this simplification, DFT remains extremely computationally expensive. In particular, DFT scales cubically with respect to the number of atoms, which restricts the size of systems that can be studied. Orbital free …

    gatech Repository record

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