Gravitational Time and Length Change, Looking for mass formula

mcjosep
Messages
35
Reaction score
0
Hi, Just curious if anyone knows of a formula that would show how mass changes in a gravitational field? I have seen the formulas for gravitational time dilation and length contraction (which are rather similar) and was wondering is mass changes the same way.

Thanks
 
Physics news on Phys.org
Mass does not change in a gravitational field.
 
mcjosep said:
I have seen the formulas for gravitational time dilation and length contraction (which are rather similar)

What formulas have you seen for "gravitational length contraction"?
 
Just to pick an extreme, a 1kg ball is a meter away from the event horizon of a black hole. So, to an outside observer, time is almost not moving at all for the 1 kg ball and its size has shrunk to almost a point due to gravitational length and time dilation but the ball would still be 1 kg?
 
PeterDonis said:
What formulas have you seen for "gravitational length contraction"?

hmm i just figured since Planck time and Planck length are related by a factor of c that they would change the same.
 
mcjosep said:
its size has shrunk to almost a point due to gravitational length

What are you basing this on? What formula? Do you have a reference?

mcjosep said:
i just figured since Planck time and Planck length are related by a factor of c that they would change the same.

The Planck time and Planck length are not the same as the length of an object or its proper time.
 
Thread 'Can this experiment break Lorentz symmetry?'

Thread 'Can this experiment break Lorentz symmetry?'

1. The Big Idea: According to Einstein’s relativity, all motion is relative. You can’t tell if you’re moving at a constant velocity without looking outside. But what if there is a universal “rest frame” (like the old idea of the “ether”)? This experiment tries to find out by looking for tiny, directional differences in how objects move inside a sealed box. 2. How It Works: The Two-Stage Process Imagine a perfectly isolated spacecraft (our lab) moving through space at some unknown speed V...
View full post »

Thread 'Relativator (Circular Slide-Rule): Simulated with Desmos - Insight'

Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. The Relativator was sold by (as printed) Atomic Laboratories, Inc. 3086 Claremont Ave, Berkeley 5, California , which seems to be a division of Cenco Instruments (Central Scientific Company)... Source: https://www.physicsforums.com/insights/relativator-circular-slide-rule-simulated-with-desmos/ by @robphy
View full post »

Thread '1-Way Speed of Light'

Does the speed of light change in a gravitational field depending on whether the direction of travel is parallel to the field, or perpendicular to the field? And is it the same in both directions at each orientation? This question could be answered experimentally to some degree of accuracy. Experiment design: Place two identical clocks A and B on the circumference of a wheel at opposite ends of the diameter of length L. The wheel is positioned upright, i.e., perpendicular to the ground...
View full post »

Similar threads

I Lasting effects of Mass and Distance Dilation
Replies
45
Views
3K
B On time dilation and length contraction
Replies
34
Views
3K
I Gravitational Field Transformations Under Boosted Velocity
Replies
14
Views
3K
I Is there a gravitational effect on spatial measurements
Replies
18
Views
1K
I Non-Inertial Relativistic Dynamics
Replies
18
Views
1K
B Explaining Distant Time Dilation & Enhanced Gravitation
Replies
4
Views
2K
I How time dilation is a permanent change and length contraction not?
Replies
13
Views
2K
I GPS system and general relativity
3
Replies
103
Views
5K
A Looking for linear frame dragging formula
Replies
3
Views
163
B Does Spacetime Have Physical Existence?
2
Replies
58
Views
3K

Hot Threads

Recent Insights

Back
Top