Results 21 to 30 of about 353 (152)

Moyal products—a new perspective on quasi-Hermitian quantum mechanics [PDF]

Journal of Physics A: Mathematical and General, 2006
The rationale for introducing non-hermitian Hamiltonians and other observables is reviewed and open issues identified. We present a new approach based on Moyal products to compute the metric for quasi-hermitian systems. This approach is not only an efficient method of computation, but also suggests a new perspective on quasi-hermitian quantum mechanics
Scholtz, FG, Geyer, HB
openaire   +2 more sources

Producto de Groenewold-von Neumann mediante una transformada de Segal-Bargmann

Revista Integración, 2015
Usando técnicas de cuantización geométrica, obtenemos el producto de funciones en R2, primeramente introducido por von Neumann y posteriormente reintroducido por Groenewold, el cual es la versión integral del producto de Moyal-Weyl.
John B. Moreno
doaj   +1 more source

Late time acceleration in a non-commutative model of modified cosmology

Physics Letters B, 2014
We investigate the effects of non-commutativity between the position–position, position–momentum and momentum–momentum of a phase space corresponding to a modified cosmological model.
B. Malekolkalami, K. Atazadeh, B. Vakili
doaj   +1 more source

Computing in string field theory using the Moyal star product [PDF]

Physical Review D, 2002
Using the Moyal star product, we define open bosonic string field theory carefully, with a cutoff, for any number of string oscillators and any oscillator frequencies. Through detailed computations, such as Neumann coefficients for all string vertices, we show that the Moyal star product is all that is needed to give a precise definition of string ...
Bars, Itzhak, Matsuo, Yutaka
openaire   +2 more sources

Moyal Product and Representations of Solvable Lie Groups

Journal of Functional Analysis, 1995
Let \(G = \text{exp}({\mathfrak g})\) be a simply connected connected solvable Lie group with Lie algebra \(\mathfrak g\). Let \({\mathcal O} = \text{Ad}^*(G)l\) be a coadjoint orbit of \(G\). Such an orbit is not simply connected in general. Pukanszky has given an explicit description of its universal covering \({\mathcal O}_0 = G/G(l)_0\), where \(G ...
Arnal, D, Cortet, J.C, Ludwig, J
openaire   +1 more source

Matter Chern Simons theories in a background magnetic field

Journal of High Energy Physics, 2019
We study large N 2+1 dimensional fermions in the fundamental representation of an SU(N) k Chern Simons gauge group in the presence of a uniform background magnetic field for the U (1) global symmetry of this theory.
Indranil Halder, Shiraz Minwalla
doaj   +1 more source

On Continuous Moyal Product Structure in String Field Theory [PDF]

Journal of High Energy Physics, 2002
18+7 pages, 1 figure, typos ...
Belov, D. M., Konechny, A. K.
openaire   +2 more sources

Moyal brackets, star products and the generalised Wigner function [PDF]

Chaos, Solitons & Fractals, 1999
The Wigner-Weyl- Moyal approach to Quantum Mechanics is recalled, and similarities to classical probability theory emphasised. The Wigner distribution function is generalised and viewed as a construction of a bosonic object, a target space co-ordinate, for example, in terms of a bilinear convolution of two fermionic objects, e.g. a quark antiquark pair.
openaire   +3 more sources

Operator equations and Moyal products–metrics in quasi-Hermitian quantum mechanics [PDF]

Physics Letters B, 2006
The Moyal product is used to cast the equation for the metric of a non-hermitian Hamiltonian in the form of a differential equation. For Hamiltonians of the form $p^2+V(ix)$ with $V$ polynomial this is an exact equation. Solving this equation in perturbation theory recovers known results.
Scholtz F.G., Geyer H.B.
openaire   +4 more sources

Wittgenstein, normativity and the ‘space of reasons’

Philosophical Investigations, Volume 49, Issue 2, Page 195-211, April 2026.
Abstract Wittgenstein's naturalism illuminates our ordinary normative practices of giving and asking for reasons and also related ‘philosophical’ conceptions of knowledge inspired by, for example, Sellars's image of the ‘space of reasons’. Some propose that the relevant naturalism motivates scepticism about the ‘space of reasons’ insofar as it ...
Benedict Smith
wiley   +1 more source