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QFT, Antimatter, and Symmetry
, 2009
"... A systematic analysis is made of the relations between the symmetries of a classical field and the symmetries of the oneparticle quantum system that results from quantizing that field in regimes where interactions are weak. The results are applied to gain a greater insight into the phenomenon of an ..."
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Cited by 1 (0 self)
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A systematic analysis is made of the relations between the symmetries of a classical field and the symmetries of the oneparticle quantum system that results from quantizing that field in regimes where interactions are weak. The results are applied to gain a greater insight into the phenomenon of antimatter. 1
BBGKY hierarchy in scalar QFT.
, 2001
"... keywords:BBGKY hierarchy, Wigner’s function, renormalization, scalar field. ..."
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keywords:BBGKY hierarchy, Wigner’s function, renormalization, scalar field.
Particle Physics and QFT at the Turn of the
, 2000
"... Century: Old principles with new concepts (an essay on local quantum physics) revised and updated version. ..."
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Century: Old principles with new concepts (an essay on local quantum physics) revised and updated version.
PERSPECTIVE  INSIGHT The other QFT
, 2015
"... Fluctuation theorems go beyond the linear response regime to describe systems far from equilibrium. But what happens to these theorems when we enter the quantum realm? The answers, it seems, are now coming thick and fast. Simply put, fluctuation theorems connect the probabilities for quantities like ..."
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Fluctuation theorems go beyond the linear response regime to describe systems far from equilibrium. But what happens to these theorems when we enter the quantum realm? The answers, it seems, are now coming thick and fast. Simply put, fluctuation theorems connect the probabilities for quantities like work, heat or particle number in an experiment to those that would be observed in a timereversed setup. Although these relations only hold when both the forward and backward processes start out in thermal equilibrium, they apply to systems that may be subsequently driven arbitrarily far from equilibrium. They are not restricted to the linear response regime, and instead establish exact relations between the nonequilibrium fluctuations of these forward and backward processes, and the equilibrium quantities of the corresponding equilibrium states. Perhaps unsurprisingly, research focused on how this formalism translates to the quantum world has undergone rapid progress in recent years, leading to quantum fluctuation theorems (QFTs), which open up promising new avenues for characterizing the nonlinear transport of energy, charge or heat for quantum devices and engines. The response of a system to a disturbance can reveal valuable information about the state and properties of the system. Many experimental techniques use this basic effect to determine electrical, magnetic, mechanical, thermal and other properties of materials by means of specifically designed perturbations. Indeed, linear response theory provides a convenient theoretical description of a system’s timedependent reaction to a small perturbation in terms of the fluctuations of the unperturbed system1–9. The theory was largely developed in the 1950s for systems initially in thermal equilibrium, and made a name for the likes
From QFT to DCC
, 2008
"... A quantum field theoretical model for the dynamics of the disoriented chiral condensate is presented. A unified approach to relate the quantum field theory directly to the formation, decay and signals of the DCC and its evolution is taken. We use a background field analysis of the O(4) sigma model k ..."
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A quantum field theoretical model for the dynamics of the disoriented chiral condensate is presented. A unified approach to relate the quantum field theory directly to the formation, decay and signals of the DCC and its evolution is taken. We use a background field analysis of the O(4) sigma model keeping oneloop quantum corrections (quadratic order in the fluctuations). An evolution of the quantum fluctuations in an external, expanding metric which simulates the expansion of the plasma, is carried out. We examine, in detail, the amplification of the low momentum pion modes with two competing effects, the expansion rate of the plasma and the transition rate of the vacuum configuration from a metastable state into a stable state.We show the effect of DCC formation on the multiplicity distributions and the BoseEinstein correlations. 1
On the gauge theory/geometry correspondence
 Adv. Theor. Math. Phys
, 1999
"... The ’t Hooft expansion of SU(N) ChernSimons theory on S3 is proposed to be exactly dual to the topological closed string theory on the S2 blow up of the conifold geometry. The Bfield on the S2 has magnitude Ngs = λ, the ’t Hooft coupling. We are able to make a number of checks, such as finding exa ..."
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Cited by 280 (37 self)
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The ’t Hooft expansion of SU(N) ChernSimons theory on S3 is proposed to be exactly dual to the topological closed string theory on the S2 blow up of the conifold geometry. The Bfield on the S2 has magnitude Ngs = λ, the ’t Hooft coupling. We are able to make a number of checks, such as finding exact agreement at the level of the partition function computed on both sides for arbitrary λ and to all orders in 1/N. Moreover, it seems possible to derive this correspondence from a linear sigma model description of the conifold. We propose a picture whereby a perturbative Dbrane description, in terms of holes in the closed string worldsheet, arises automatically from the coexistence of two phases in the underlying U(1) gauge theory. This approach holds promise for a derivation of the AdS/CFT correspondence.
AQFT from nfunctorial QFT
"... There are essentially two different approaches to the axiomatization of quantum field theory (QFT): algebraic QFT, going back to Haag and Kastler, and functorial QFT, going back to Atiyah and Segal. More recently, based on ideas by Baez and Dolan, the latter is being refined to “extended ” functoria ..."
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Cited by 7 (4 self)
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There are essentially two different approaches to the axiomatization of quantum field theory (QFT): algebraic QFT, going back to Haag and Kastler, and functorial QFT, going back to Atiyah and Segal. More recently, based on ideas by Baez and Dolan, the latter is being refined to “extended
Motivations and Physical Aims of Algebraic QFT
, 1996
"... We present illustrations which show the usefulness of algebraic QFT. In particular in lowdimensional QFT, when Lagrangian quantization is not available or is useless (e.g. in chiral conformal theories), the algebraic method is beginning to reveal its strength. This work is dedicated to the memory o ..."
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We present illustrations which show the usefulness of algebraic QFT. In particular in lowdimensional QFT, when Lagrangian quantization is not available or is useless (e.g. in chiral conformal theories), the algebraic method is beginning to reveal its strength. This work is dedicated to the memory
Results 11  20
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