منابع مشابه
Chiral Partners in a Chirally Broken World
The isovector–vector and the isovector–axial-vector current are related by a chiral transformation. These currents can be called chiral partners at the fundamental level. In a world where chiral symmetry was not broken, the corresponding current-current correlators would show the same spectral information. In the real world chiral symmetry is spontaneously broken. A prominent peak — the ρ-meson...
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We discuss the physics of the mirror (shadow) world which is completely analogous to the visible one except that its 'weak' scale is larger by one or two orders of magnitude than the weak scale in the standard model. The mirror neutrinos can mix the ordinary ones through the Planck scale induced higher order operators, which can help to reconcile the present neutrino puzzles that are the solar ...
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If the Lagrangian of nature respects parity invariance then there are two distinct possibilities: either parity is unbroken by the vacuum or it is spontaneously broken. We examine the two simplest phenomenologically consistent gauge models which have unbroken and spontaneously broken parity symmetries, respectively. These two models have a Lagrangian of the same form, but a different parameter ...
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The increased frequency of sudden cardiac death after earthquakes and bombings has long proposed that emotional distress plays a role in acute coronary syndromes and arrhythmias. Since the 1960s, several controlled, prospective, epidemiological studies have reported emotional distress as a major risk factor for the onset and worsening of coronary heart disease (CHD) [1]. The Interheart study, a...
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For the foreseeable future, controlled medical vocabularies will be in a constant state of development, expansion and refinement. Changes in controlled vocabularies must be reconciled with historical patient information which is coded using those vocabularies and stored in clinical databases. This paper explores the kinds of changes that can occur in controlled vocabularies, including adding te...
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ژورنال
عنوان ژورنال: D-Lib Magazine
سال: 2017
ISSN: 1082-9873
DOI: 10.1045/march2017-lovins