A new field experiment in the Greenland ice cap to test Newton's inverse square law
A geophysical experiment was conducted in a 2-km-deep hole in the Greenland ice cap at depths between 213 m and 1673 m to test for possible violations of Newton's inverse-square law. A detailed ice-sounding radar survey was carried out to 5 km from the hole and merged with regional airborne rad...
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Los Alamos National Laboratory
1988
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ftunivnotexas:info:ark/67531/metadc1207503 2023-05-15T16:27:16+02:00 A new field experiment in the Greenland ice cap to test Newton's inverse square law Ander, M. E. Zumberge, M. A. Lautzenhiser, T. Parker, R. L. Aiken, C. L. V. Gorman, M. R. Nieto, M. M. Ferguson, J. F. McMechan, G. A. 1988-01-01 21 pages Text https://digital.library.unt.edu/ark:/67531/metadc1207503/ English eng Los Alamos National Laboratory other: DE89009247 rep-no: LA-UR-89-1095 rep-no: CONF-881268-3 grantno: W-7405-ENG-36 osti: 6313797 https://digital.library.unt.edu/ark:/67531/metadc1207503/ ark: ark:/67531/metadc1207503 14. Texas symposium on relativistic astrophysics, Dallas, TX, USA, 11 Dec 1988 Greenland Testing Measuring Methods Earth Planet Planets 657003* -- Theoretical & Mathematical Physics-- Relativity & Gravitation 71 Classical And Quantum Mechanics General Physics Gravitation Article 1988 ftunivnotexas 2021-01-16T23:08:16Z A geophysical experiment was conducted in a 2-km-deep hole in the Greenland ice cap at depths between 213 m and 1673 m to test for possible violations of Newton's inverse-square law. A detailed ice-sounding radar survey was carried out to 5 km from the hole and merged with regional airborne radar data to define the basement interface. Highly accurate gravity measurements were carried out to 15 km from the hole to detect lateral density changes in the bedrock. The measurements were controlled with very accurate satellite and conventional positioning techniques. The basement interface model was input into a Newtonian computation to correct the observed gravity for known earth structure resulting in an anomalous gravity gradient of +3.87 mGal. A 3 dimensional ideal body analysis of the surface and borehole gravity data provided a means of bounding all possible Newtonian solutions for lateral density variation below the ice. Solutions with regional gravity offsets greater than or equal to10 mGal and density contrasts less than or equal to0.30 g/cm/sup 3/ are possible. We cannot unambiguously attribute the anomalous gradient to a breakdown of Newtonian gravity because there remains the possibility it is due to unexpected geological features in the rock below the ice. 11 refs., 6 figs., 1 tab. Article in Journal/Newspaper Greenland Ice cap University of North Texas: UNT Digital Library Greenland |
institution |
Open Polar |
collection |
University of North Texas: UNT Digital Library |
op_collection_id |
ftunivnotexas |
language |
English |
topic |
Greenland Testing Measuring Methods Earth Planet Planets 657003* -- Theoretical & Mathematical Physics-- Relativity & Gravitation 71 Classical And Quantum Mechanics General Physics Gravitation |
spellingShingle |
Greenland Testing Measuring Methods Earth Planet Planets 657003* -- Theoretical & Mathematical Physics-- Relativity & Gravitation 71 Classical And Quantum Mechanics General Physics Gravitation Ander, M. E. Zumberge, M. A. Lautzenhiser, T. Parker, R. L. Aiken, C. L. V. Gorman, M. R. Nieto, M. M. Ferguson, J. F. McMechan, G. A. A new field experiment in the Greenland ice cap to test Newton's inverse square law |
topic_facet |
Greenland Testing Measuring Methods Earth Planet Planets 657003* -- Theoretical & Mathematical Physics-- Relativity & Gravitation 71 Classical And Quantum Mechanics General Physics Gravitation |
description |
A geophysical experiment was conducted in a 2-km-deep hole in the Greenland ice cap at depths between 213 m and 1673 m to test for possible violations of Newton's inverse-square law. A detailed ice-sounding radar survey was carried out to 5 km from the hole and merged with regional airborne radar data to define the basement interface. Highly accurate gravity measurements were carried out to 15 km from the hole to detect lateral density changes in the bedrock. The measurements were controlled with very accurate satellite and conventional positioning techniques. The basement interface model was input into a Newtonian computation to correct the observed gravity for known earth structure resulting in an anomalous gravity gradient of +3.87 mGal. A 3 dimensional ideal body analysis of the surface and borehole gravity data provided a means of bounding all possible Newtonian solutions for lateral density variation below the ice. Solutions with regional gravity offsets greater than or equal to10 mGal and density contrasts less than or equal to0.30 g/cm/sup 3/ are possible. We cannot unambiguously attribute the anomalous gradient to a breakdown of Newtonian gravity because there remains the possibility it is due to unexpected geological features in the rock below the ice. 11 refs., 6 figs., 1 tab. |
format |
Article in Journal/Newspaper |
author |
Ander, M. E. Zumberge, M. A. Lautzenhiser, T. Parker, R. L. Aiken, C. L. V. Gorman, M. R. Nieto, M. M. Ferguson, J. F. McMechan, G. A. |
author_facet |
Ander, M. E. Zumberge, M. A. Lautzenhiser, T. Parker, R. L. Aiken, C. L. V. Gorman, M. R. Nieto, M. M. Ferguson, J. F. McMechan, G. A. |
author_sort |
Ander, M. E. |
title |
A new field experiment in the Greenland ice cap to test Newton's inverse square law |
title_short |
A new field experiment in the Greenland ice cap to test Newton's inverse square law |
title_full |
A new field experiment in the Greenland ice cap to test Newton's inverse square law |
title_fullStr |
A new field experiment in the Greenland ice cap to test Newton's inverse square law |
title_full_unstemmed |
A new field experiment in the Greenland ice cap to test Newton's inverse square law |
title_sort |
new field experiment in the greenland ice cap to test newton's inverse square law |
publisher |
Los Alamos National Laboratory |
publishDate |
1988 |
url |
https://digital.library.unt.edu/ark:/67531/metadc1207503/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice cap |
genre_facet |
Greenland Ice cap |
op_source |
14. Texas symposium on relativistic astrophysics, Dallas, TX, USA, 11 Dec 1988 |
op_relation |
other: DE89009247 rep-no: LA-UR-89-1095 rep-no: CONF-881268-3 grantno: W-7405-ENG-36 osti: 6313797 https://digital.library.unt.edu/ark:/67531/metadc1207503/ ark: ark:/67531/metadc1207503 |
_version_ |
1766016400486301696 |