Gravitational Waves: Speed & How Objects Affect it

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Gravitational waves travel at the speed of light in a vacuum, denoted as "c." When passing through matter, their speed can be affected, potentially slowing down depending on the material's properties. Certain objects, particularly metamaterials, may significantly alter the propagation of gravitational waves. The discussion highlights the importance of understanding how different materials interact with these waves. Overall, gravitational waves maintain their fundamental speed limit in a vacuum but can experience variations in other environments.
cragar
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What speed do gravitational waves travel in matter. Is it a little less than c. Are their certain objects that slow it down a lot.
 
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thanks for the response
 
Also, note that gravitational waves always propagate at the speed of light in a vacuum.
 

Thread 'Am I understanding the concept of proper frame of reference?'

MOVING CLOCKS In this section, we show that clocks moving at high speeds run slowly. We construct a clock, called a light clock, using a stick of proper lenght ##L_0##, and two mirrors. The two mirrors face each other, and a pulse of light bounces back and forth betweem them. Each time the light pulse strikes one of the mirrors, say the lower mirror, the clock is said to tick. Between successive ticks the light pulse travels a distance ##2L_0## in the proper reference of frame of the clock...
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