Sökning: "Sigma models"

Visar resultat 11 - 15 av 30 avhandlingar innehållade orden Sigma models.

  1. 11. Renormalization in Effective Field Theory and Hidden Radiation

    Författare :Lisa Carloni; Teoretisk partikelfysik - Geonomgår omorganisation; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Renormalization; Effective theories; Phenomenological Models; Hidden Sectors;

    Sammanfattning : This thesis dealswith the field of high-energy particle physics. It ismainly concernedwith two issues: the “renormalization of effective field theories” and the “detection of hidden sectors”. The first two papers are dedicated to the renormalization issue while the second two deal with the hidden sectors. LÄS MER

  3. 12. Endogenous and treatment-induced neuroplasticity in mouse models of Parkinson's disease

    Författare :Francesco Bez; Basala gangliernas patofysiologi; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES;

    Sammanfattning : Parkinson´s disease (PD) is an age-related neurodegenerative disorder characterized by a loss of nigral dopamine (DA) neurons that project their axons to the striatum. Striatal DA depletion causes the typical motor symptoms of PD. LÄS MER

  4. 13. Criticality and Frustration: Classical and Quantum Spin Models in Two Dimensions

    Författare :Per Fröjdh; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : We investigate two-dimensional spin models and begin with an introduction to critical phenomena with emphasis on classical systems with boundaries and conformal invariance. Then we introduce the antiferromagnetic quantum Heisenberg model with frustrating interactions. LÄS MER

  5. 14. Studies of Molecular and Cluster Fragmentation Using Synchrotron Radiation: Measurements and Models

    Författare :Andreas Lindgren; Synkrotronljusfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Atom- och molekylärfysik; Atomic and molecular physics; photoionization; synchrotron radiation; localized excitation; electron-ion coincidence; induced alignment; clusters; molecules; core excitation; mass spectroscopy; fragmentation; dissociation;

    Sammanfattning : A new spectrometer for studying photoinduced fragmentation has been designed and commissioned. The instrument produces a detailed view of the energy and angular emission of fragments, which in the case of small molecules can be related to their geometry at the moment of dissociation. LÄS MER

  7. 15. Developing the third generation Calphad models and descriptions: a journey from unary to higher-order systems

    Författare :Zhangting He; Malin Selleby; Huahai Mao; Andreas Blomqvist; Gabriele Cacciamani; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Teknisk materialvetenskap; Materials Science and Engineering;

    Sammanfattning : The third generation Calphad descriptions aim to provide more accurate computational thermodynamics for an extended temperature range, i.e. from 0 K to high temperatures. In order to achieve such a goal, new Calphad models are needed. LÄS MER