PHYS 183 Lecture Notes - Lecture 18: Metallicity, Disc Galaxy, Open Cluster

• School: McGill University
• Department: Physics
• Course: PHYS 183
• Professor: Gilbert Holder

Document Summary

Equivalence principle: motion due to a gravitational field is indistinguishable from motion due to upwards acceleration (windowless box) Mass distorts space time, so what we feel in a gravitational field is that distortion, and gravity is essentially geometric. One test of the theory was observing the trajectory of light from a star moving past the sun during a solar eclipse. The g field does work on the light and changes its energy. Gravitationa redshift z = change in wavelength/wavelength = gm/rc^2 (r is distance from the center of the object) Black holes and schwarzchild radius rs = 2gm/c^2. For a(cid:374)(cid:455) sphere of (cid:373)ass m, if r