Elektromagnetische Felder: Mathematische Und Physikalische Grundlagen / Anwendungen in Physik Und Technik
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form tiber einem gegebenen Vektorraum. Die Dualitat erlaubt, die metrische Bilinear- form (das Skalarprodukt) durch die kanonische Bilinearform zu ersetzen. Uber die auBere Algebra der mit dem Tang ntenraum in einem Punkt assoziierten Multilinear- formen gelangt man zu den von Cartan eingeftihrten auBeren Differentialformen. Dif- ferentialformen sind Objekte, die ohne Bezugnahme auf geometrische Strukturen tiber Kurven, Flachen etc. integriert werden konnen. E s ist deshalb naheliegend, die elek- tromagnetischen FeldgroBen als Differentialformen aufzufassen. Dabei ist es zweck- maBig, . sich an die von Mie eingeftihrte Unterscheidung von Intensitats-und Quantitats- groBen zu erinnern. Differentialformen im eigentlichen Sinn sind nur die Intensitats- groBen, also das elektrische Feld und das Feld der"magnetischen Induktion. Die elek- trische Verschiebungsdichte und die magnetische Feldstarke sind in dem von de Rham eingeftihrten Sinn Stromformen, d. h. Differentialformen, deren Koeffizienten Distri- butionen sind. Letztere lassen sich jedoch durch ungerade Differentialformen mit pseu- doskalaren Koeffizienten darstellen. Die Maxwellschen Gleichungen erscheinen bei dieser Betrachtung als Beziehungen zwi- schen Differentialformen, die keine geometrischen Strukturen mehr enthalten. Die geo- metrischen Eigenschaften des Raumes gehen in die Materialgleichungen des Vakuums ein, die die . IntensitatsgroBen mit den QuantitatsgroBen verbinden. Die Zuordnung ge- schieht mit Hilfe des sogenannten *-Operators (Hodge-Dualitat), der ungerade (3-n)- Formen auf gerade n-Formen abbildet und umgekehrt. Die Euklidische Metrik ordnet den FeldgroBen nattirliche Langendimensionen zu, so daB die Dimensionen der Koeffi- zienten durch Ladung, Wirkung und Geschwindigkeit ausgedrtickt werden konnen, deren nattirliche Einheiten durch Naturkonstanten fixiert werden.
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