AHA-BUCH

Functional Renormalization and Ultracold Quantum Gases

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ISBN-13:
9783642141126
Einband:
Buch
Erscheinungsdatum:
01.09.2010
Seiten:
199
Autor:
Stefan Flörchinger
Gewicht:
461 g
Format:
247x164x18 mm
Serie:
Springer Theses
Sprache:
Englisch
Beschreibung:

Here, modern techniques from quantum field theory are applied to the description of ultracold quantum gases, enabling a unified description of numerous phenomena including superfluidity for bosons and fermions and classical and quantum phase transitions.
-A major contribution to the way we describe ultracold quantum gases
- Represents a quantitative improvement over previous methods and brings qualitatively new insights.
- Nominated by the University of Heidelberg as an outstanding theoretical contribution
Introduction.- The Wetterich equation.- Generalized flow equation .-Truncations .-
Cutoff choices .- Investigated models.- Symmetries.- Truncated flow equations .-Few-body physics.-Many-body physics.-Conclusions.- A. Some ideas on functional integration and probability.-B. Technical additions.-Bibliography
Modern techniques from quantum field theory are applied to the description of ultracold quantum gases. This leads to a unified description of many phenomena including superfluidity for bosons and fermions, classical and quantum phase transitions, different dimensions, thermodynamic properties and few-body phenomena as bound state formation or the Efimov effect.The non-perturbative treatment with renormalization group flow equations can account for all known limiting cases by solving one single equation.
It improves previous results quantitatively and brings qualitatively new insights. As an example, new quantum phase transitions are found for fermions with three spin states.
Ultracold atomic gases can be seen as an interesting model for features of high energy physics and for condensed matter theory. The research reported in this thesis helps to solve the difficult complexity problem in modern theoretical physics.

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