118 research outputs found
How to Formulate Non-Equilibrium Local States in QFT? --General Characterization and Extension to Curved Spacetime--
The essence of a general formulation to accommodate non-equilibrium local
states in relativistic quantum field theory is explained from the viewpoint of
comparison at a spacetime point between unknown generic states to be
characterized as such states and the known family of probabilistic mixtures of
equilibrium states. Taking advantage of the local nature of the problem, we
extend the formalism to the general-relativistic context with curved
spacetimes.Comment: Dedicated to Professor Hiroshi Ezawa on the occasion of his
seventieth birthda
Micro-Macro Duality and Emergence of Macroscopic Levels
The mutual relation between quantum Micro and classical Macro is clarified by
a unified formulation of instruments describing measurement processes and the
associated amplification processes, from which some perspective towards a
description of emergence processes of spacetime structure is suggested.Comment: An invited talk at an International Symposium QBIC 200
Photon localization revisited
In the light of Newton-Wigner-Wightman theorem of localizability question, we
have proposed before a typical generation mechanism of effective mass for
photons to be localized in the form of polaritons owing to photon-media
interactions. In this paper, the general essence of this example model is
extracted in such a form as Quantum Field Ontology associated with
Eventualization Principle, which enables us to explain the mutual relations
back and forth, between quantum fields and various forms of particles in the
localized form of the former.Comment: arXiv admin note: substantial text overlap with arXiv:1101.578
Supersymmetry and Homotopy
The homotopical information hidden in a supersymmetric structure is revealed
by considering deformations of a configuration manifold. This is in sharp
contrast to the usual standpoints such as Connes' programme where a geometrical
structure is rigidly fixed. For instance, we can relate supersymmetries of
types N=2n and N=(n, n) in spite of their gap due to distinction between
(even-odd)- and integer-gradings.
Our approach goes beyond the theory of real homotopy due to Quillen, Sullivan
and Tanr\'e developed, respectively, in the 60's, 70's and 80's, which exhibits
real homotopy of a 1-connected space out of its de Rham-Fock complex with
supersymmetry. Our main new step is based upon the Taylor (super-)expansion and
locality, which links differential geometry with homotopy without the
restriction of 1-connectedness. While the homotopy invariants treated so far in
relation with supersymmetry are those depending only on -grading
like the index, here we can detect new -graded homotopy invariants.
While our setup adopted here is (graded) commutative, it can be extended also
to the non-commutative cases in use of state germs (Haag-Ojima) corresponding
to a Taylor expansion
Notes on the Krupa-Zawisza Ultrapower of Self-Adjoint Operators
It is known that there is a difficulty in constructing the ultrapower of
unbounded operators. Krupa and Zawisza gave a rigorous definition of the
ultrapower A^{omega} of a selfadjoint operator A. In this note, we give
alternative description of A^{omega} and the Hilbert space H(A) on which
A^{omega} is densely defined, which provides a criterion to determine to which
representing sequence (\xi_n)n of a given vector \xi in dom(A^{omega}) has the
property that A^{omega}\xi = (A\xi_n)_{omega} holds.Comment: 13page
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