Public
- Public
- Network
- Groups
- Popular
- People

FOURTH TEST OF GENERAL RELATIVITY Irwin I. Shapiro Lincoln Laboratory,* Massachusetts Institute of Technology, Lexington, Massachusetts (Received 13 November 1964) Recent advances in radar astronomy have made possible a fourth test of Einstein's theory of general relativity. The test involves measuring the time delays between transmission of radar pulses towards either of the inner planets (Venus or Mercury) and detection of the echoes. Because, according to the general theory, the speed of a light wave depends on the strength of the gravitational potential along its path, these time delays should thereby be increased hv almost 2X10^{-4} sec

Download link

FOURTH TEST OF GENERAL RELATIVITY Irwin I. Shapiro Lincoln Laboratory,* Massachusetts Institute of Technology, Lexington, Massachusetts (Received 13 November 1964) Recent advances in radar astronomy have made possible a fourth test of Einstein's theory of general relativity. The test involves measuring the time delays between transmission of radar pulses towards either of the inner planets (Venus or Mercury) and detection of the echoes. Because, according to the general theory, the speed of a light wave depends on the strength of the gravitational potential along its path, these time delays should thereby be increased hv almost 2X10^{-4} sec
https://files.mastodon.social/media_attachments/files/111/403/877/893/975/777/original/ee965814a654007f.jpeg

Notices where this attachment appears

Robert McNees (mcnees@mastodon.social)'s status on Monday, 13-Nov-2023 15:11:23 UTC Robert McNees

When Einstein proposed general relativity he laid out three tests: the precession of Mercury's perihelion, deflection of light by the sun, and gravitational redshift.
Irwin Shapiro proposed a fourth test #OTD in 1964: the gravitational time delay of light.
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.13.789

In conversation about a year ago from mastodon.social permalink