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palmer eldtrich
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As understand relativity there is no "absolute time" however I have its possible to use the CMb as a way round this? Is this right and how does it work?
Bad example, Lincoln being shot is an event which occurred in all frames. He was not not shot in the rest frame of the galactic center.Vanadium 50 said:What makes the CMB frame more special than the frame where Lincoln was shot?
The CMB does provide a valid choice of a reference frame. This choice of reference frame turns out to be very useful in that it simplifies the math for dealing with the expansion of the universe.palmer eldtrich said:As understand relativity there is no "absolute time" however I have its possible to use the CMb as a way round this? Is this right and how does it work?
Orodruin said:an event which occurred in all frames
The point is that regardless of how you assign coordinates, Lincoln was shot. This is an event which, as you say, did not occur in a frame. You seemed to want to assign events to frames since you were talking about the frame in which Lincoln was shot.Vanadium 50 said:I don't understand this. An event doesn't occur in a frame. An event occurs in real life. A frame is how we assign coordinates to that event.
Orodruin said:The point is that regardless of how you assign coordinates, Lincoln was shot. This is an event which, as you say, did not occur in a frame. You seemed to want to assign events to frames since you were talking about the frame in which Lincoln was shot.
Not right.palmer eldtrich said:As understand relativity there is no "absolute time" however I have its possible to use the CMb as a way round this? Is this right and how does it work?
Nugatory said:"What makes the CMB frame more special than the frame in which the bullet that killed Lincoln was at rest?".
Time dilation is a phenomenon in which time appears to run slower for an object moving at high speeds or in a strong gravitational field. This is a fundamental concept in Einstein's theory of relativity and is based on the idea that the laws of physics are the same for all observers, regardless of their relative motion or position.
The CMB is a remnant of the light emitted shortly after the Big Bang and is often referred to as the "oldest light" in the universe. Its existence and characteristics play a crucial role in understanding the evolution of the universe and the concept of time in relativity. The CMB provides evidence for the expansion of the universe and allows us to measure the age of the universe.
The CMB has a nearly uniform temperature of 2.7 Kelvin, which is considered a constant background temperature for the universe. However, the CMB temperature can vary slightly due to the effects of the expansion of the universe and the presence of matter and energy. This temperature is also used as a reference point for understanding the thermal history of the universe and the progression of time in relativity.
Yes, according to Einstein's theory of general relativity, gravity is the curvature of spacetime caused by massive objects. This curvature can also affect the passage of time, as gravity can slow down time in strong gravitational fields. This has been demonstrated through experiments such as the famous "twin paradox" where one twin ages slower than the other due to being in a different gravitational environment.
In relativity, time is considered a relative concept, meaning that it can be experienced differently by different observers depending on their relative motion and position. This is in contrast to our everyday experience of time, where it is perceived as a constant and unchanging entity. Additionally, the idea of time being affected by gravity and the curvature of spacetime is also not something we typically encounter in our everyday lives.