All Questions
58
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Cause of Coordinate Acceleration in Free Fall [duplicate]
So I understand that objects in free fall are in an inertial frame, at rest in terms of relativity. However, from a person on the surface of earth, a falling apple is accelerating constantly until it ...
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64
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Is it possible to know if you're moving or standing still due to the definition of Einsteins equivalence principle?
I have a question regarding Einstein's theory of relativity.
Einstein's equivalence principle states that locally it's not possible to tell if you're accelerating or being stationary in a ...
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4
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3
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408
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Confusion over what constitutes a uniform gravitational field in relativity
Suppose we have some observer moving upwards with a constant proper acceleration, by the equivalence principle this is the same as the observer remaining stationary in a gravitational field, like ...
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28
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When we are on the ground do we still accelerate with 9.8 m/s²? [duplicate]
Do we accelerate with 9.8 m/s² when we are on the ground , if so why we do not fall inside the eart . How is the net force is zero , how many real forces acts on the body ?
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2
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92
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How can you use General Relativity to find the acceleration $9.81$ m$/$s$^2$ due to gravity? [duplicate]
Using the Schwarzschild metric and the mostly minus signature, how can I calculate the $9.81$ m$/$s$^2$ of acceleration on Earth using general relativity and the geodesic equation?
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4
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113
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What is the gravitational field of an accelerated particle?
Could we simply change coordinates of the Schwarzschild metric in order to obtain the metric of a moving massive particle? Which would those coordinates be? Rindler coordinates? Maybe there is a ...
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2
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2k
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What kind of coordinate change is needed to make gravity disappear?
I understand that the Christoffel symbols associated with the metric will vanish locally once you perform the appropiate change of coordinates. These new coordinates correspond to an observer in free-...
- 391
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How is this approximation of gravity involving Rindler coordinates valid?
I have seen that it is possible to approximate the metric in the presence of a gravitational field by the Rindler metric:
Does a uniform gravitational field exist? Is there any acceleration in a ...
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Earth surface acceleration and inertial geodesics
I hope this is an appropriate question for this forum. It is one I have struggled with for a while.
I read that in GR gravity is not a force, and that the apparent force we feel and can measure (eg ...
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0
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80
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Is non-linear acceleration a necessary condition for an object to generate gravitational waves?
I was assuming every object that interferes with the gravitational field creates gravitational waves, and someone pointed out that only objects under acceleration do so. I searched through many sites ...
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52
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On the distances on the earth's Surface as seen from a spatial external observer in general relativity
Recently I was thinking about general relativity, I was wondering what distances would look like on the earth's surface seen from outer space, according to general relativity time passes more slowly ...
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4
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4
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738
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Why do object accelerate towards the Earth in general relativity?
In general relativity something in free fall, that appear to accelerate towards the earth, is actually not accelerating at all but moving along a geodesic so why does it appear that it is accelerating ...
- 340
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3
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1k
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Does a uniform gravitational field exist? Is there any acceleration in a uniform gravity field?
This question arose in the Space Exploration forum, by non-physicists, so it likely sounds naïve. The question involved the plausibility of using a very strong gravitational field to accelerate an ...
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2
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203
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Do accelerating masses generate gravitational waves? [duplicate]
The accelerating charge can radiate electromagnetic waves, then, can the accelerating masses radiate gravitational waves?
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2
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247
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Quantum gravity in an accelerated frame of reference
It is said that we can't study quantum gravity because gravity is a weak force. But gravity and acceleration are the same. Why can't we study quantum gravity in a strongly accelerated frame of ...
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