Il Nuovo Cimento C

, Volume 8, Issue 4, pp 418–434 | Cite as

4-Geodesy

  • W. A. Miller
  • J. A. Wheeler
Article

Summary

As familiar geodesy determines the shape of the Earth from measurements of distances between selected points, so 4-geodesy has for ideal to determine spacetime geometry—and through it masses of celestial objects—by measurements of distances of selected stars from the Earth and from each other. Crucial to this enterpise is a means for determining distances transverse to the line of sight. A «lighting-profile» method is outlined for determining transverse distance: 1) trace the flash of light from a supernova as the resulting illumination makes its way to the distant galaxy, and 2) compare the observed «lighting profile» with the canonical shape calculated in the appendix.

PACS. 94.40

Cosmic rays 

PACS. 98.50

The Galaxy extragalactic objects and systems 

Riassunto

Com'è noto la geodesia determina la forma della terra dalle misurazioni delle distanze fra punti prescelti, così la 4-geodesia ha come obbiettivo quello di determinare la geometria dello spazio tempo—e mediante questa le masse degli oggetti celesti—misurando le distanze di stelle prescelte dalla terra e le una dalle altre. Cruciale per questa impresa è un mezzo per determinare le distanze trasversalmente al raggio visivo. Si delinea un metodo del profilo di illuminazione per determinare la distanza trasversale: 1) tracciare il lampo di luce da una supernova quando l'illuminazione risultante va verso la galassia distante e 2) confrontare il profilo d'illuminazione risultante osservato con il profilo canonico calcolato in appendice.

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Copyright information

© Società Italiana di Fisica 1985

Authors and Affiliations

  • W. A. Miller
    • 1
  • J. A. Wheeler
    • 1
  1. 1.Center for theoretical PhysicsThe University of Texas at AustinAustin

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