ASTRON 2B03 Lecture Notes - Fundamental Interaction, Gravitational Time Dilation, Gravitational Redshift

• School: McMaster University
• Department: Astronomy
• Course: ASTRON 2B03
• Professor: Laura Parker

Document Summary

You can"t tell the difference between the acceleration from a rocket and acceleration from gravity. Gravitational time dilation: before moving clocks move slower special relativity. Einstein speaks about 3 dimensions of space, and time. Gravity just describes curvature on spacetime about massive objects. We can measure this deflection on large scales light rays passing by sun ex. Extra kind of redshift from general relativity (beyond the one we talked about before, doppler) Light has to use energy to leave curved space-time: energy lowered = red shift. More massive the object, the more the light is redshifted. Time dilation in gravitational fields in gravity, slower the clocks move. Stronger the g field stronger the time dilation: gravity of black holes mad strong clocks run real slow. Distance bigger gravitational force gets smaller. Bottom floor closer to centre of earth more of a gravitational pull clock runs more slowly.