The Stack Overflow podcast is back! Listen to an interview with our new CEO.

# Questions tagged [observers]

The tag has no usage guidance.

676 questions
Filter by
Sorted by
Tagged with
132 views

### What exactly does the observer's coordinate system mean in special relativity?

This seems like a very basic question but I'm having a hard time understanding it, more precisely hard time visualizing it. Let say there is an observer, and we wish to somewhat formalize his ...
48 views

### Bekenstein Bound and frame of reference

According to Wikipedia, this is the formula for the Bekenstein bound $$S \le \frac{2\pi k RE}{\hbar c}$$ where $E$ is the total mass-energy. That seems to imply that the presence of a black hole in ...
528 views

### Schwarzschild geometry, what is physical meaning of coordinates?

A past exam has a question: For the Schwarzschild metric external to a non-spinning spherical mass, what is the physical significance to the coordinates $t,r,\theta,\phi$? Not sure how to answer ...
199 views

### Confusion with relativity of simultaneity

I know variations of these have probably been asked numerous times before, but I'm having trouble with this specific scenario. Imagine the classic Train Paradox, except instead of lighting strikes ...
139 views

### Understanding of derivation of time dilation

While deriving time dilation using the two postulates of Special theory of relativity we imagine that a light pulse is traveling back and forth between 2 mirrors. In the rest frame (when the observer ...
403 views

### The observer detail of double slit experiment

I have been searching internet for a while and I couldn't find any detailed information about the observer type in double slit experiment of electrons. For example is the observer a camera or ...
376 views

### Time Slowing Down [duplicate]

I'd like to ask a question if I may about the relativity. When travelling at the speed of light(which is impossible for particles with masses) or very close to it, would it be me, myself, seeing my ...
874 views

### Uncertainty principle and multiple observers

My understanding is that an observer can measure the precise location of a particle so long as the corresponding uncertainty in momentum measurement is not an issue and vice-versa. Say there is ...
105 views

### Why physics should be the same in all inertial frame? [closed]

One of the postulates of special relativity is that physics should be the same in all inertial frame. Suppose we have two observers $A$ and $B$ suppose that $A$ is accelerated. Now suppose that we ...
143 views

### Doubt of speed of light

I have a question about how an observer sees the speed of light or the distances when at rest. Suppose two events occur simultaneously in $A$ and $B$. If someone in $X$ is watching, they will see ...
137 views

### Will stationary charge radiate E.M waves if observer is accelerating?

For ex. if my frame of reference is oscillating then will i see E.M waves produced from a charge which is not oscillating with any other or ground frame of reference? Can i get a really clear answer ....
147 views

### Escape from black hole for different observers

When a particle falls through the event horizon, it cannot escape the black hole anymore, as doing so would need a speed greater than c. Is the above statement valid for all observers? For an ...
245 views

### What is the “reference frame of a particle” in General Relativity?

In Special Relativity, when one talks about "the reference frame of a particle" it is quite clear what they mean. First of all: one starts by setting up cartesian coordinates on the flat spacetime. ...
1k views

### Relativistic electromagnetism and electromagnetic forces on 2 protons

The question I have about it is how we can get the same result of net force acting on the individual protons if we judge the system from 2 different reference frames. One using more of the magnetic ...
126 views

129 views

### At a center of Gödel's universe

A few quick questions clarifying a picture about Gödel's universe, they bug me badly! Taken from here. So Gödel's universe is made out of dust particles. All of them have angular velocity. Do this ...