Search results for "History of physic"
showing 6 items of 66 documents
Quantum Field Theory
2018
Quantum field theory (QFT) shares many of its philosophical problems with quantum mechanics. This applies in particular to the quantum measurement process and the connected interpretive problems, to which QFT contributes hardly any new aspects, let alone solutions. The question as to how the objects described by the theory are spatially embedded was already also discussed for quantum mechanics. However, the new mathematical structure of QFT promises new answers, which renders the spatiotemporal interpretation of QFT the pivotal question. In this chapter, we sketch the mathematical characteristics of QFT and show that a particle as well as a field interpretation breaks down.
Well-posedness of a nonlinear evolution equation arising in growing cell population
2011
We prove that a nonlinear evolution equation which comes from a model of an age-structured cell population endowed with general reproduction laws is well-posed. Copyright © 2011 John Wiley & Sons, Ltd.
Exact constants in Poincaré type inequalities for functions with zero mean boundary traces
2014
In this paper, we investigate Poincare type inequalities for the functions having zero mean value on the whole boundary of a Lipschitz domain or on a measurable part of the boundary. We find exact and easily computable constants in these inequalities for some basic domains (rectangles, cubes, and right triangles) and discuss applications of the inequalities to quantitative analysis of partial differential equations. Copyright © 2014 John Wiley & Sons, Ltd.
Field-cooling experiments on the quadrupolar-glass state of (KBr)0.47(KCN)0.53
1990
The shear strain of a mixed cyanide crystal has been measured under field-cooling conditions. The time decay after field removal follows a Kohlrausch-Williams-Watts law. The results are analogous to spin glasses, except that residual permanent strains can be frozen-in.
Pulling Harriot Out of Newton’s Shadow: How the Norwegian Outsider Johannes Lohne Came to Contribute to Mainstream History of Mathematics
2016
The focus of this paper is on the peculiarities of Lohne ’s “outsider approach” to the historiography of mathematics and physics. The main thesis is that the circumstances of Lohne ’s outsider position both narrowed down and sharpened the focus of his research, but that he succeeded because he joined the then rising tide of archival based and content oriented internalist research in the history of physics and mathematics and because he was supported by scholars such as D.T. Whiteside and J.E. Hofmann , whose connections to the international community were better than his own. The main conclusions are based on Lohne ’s Nachlass in Oslo and on some other archival sources. In addition Lohne ’s…
Rich clusters from SDSS DR8
2012
The study of the properties of galaxy clusters and their environment gives us information about the formation and evolution of galaxies, groups and clusters, and larger structures - superclusters of galaxies and the whole cosmic web. We study the relations between the multimodality of galaxy clusters drawn from the SDSS DR8 and the environment where they reside. As cluster environment we consider the global luminosity density field, supercluster membership, and supercluster morphology.