Gravitational field in the galaxy and Schwarzschild´s time dilation

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Discussion Overview

The discussion revolves around estimating the gravitational force exerted by the center of a galaxy, such as the Milky Way or Andromeda, on a point within its orbit, as well as exploring the applicability of the Schwarzschild solution for calculating time dilation between Earth and points in an external galaxy.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant inquires about estimating the gravitational force from a galaxy's center to a point in its orbit and the relevance of the Schwarzschild solution for time dilation calculations.
  • Another participant suggests that it is possible to estimate the gravitational force by determining the mass within the region of interest and applying gravitational laws.
  • A later reply expresses uncertainty regarding the specifics of the Schwarzschild solution but indicates that time dilation calculations between Earth and other visible points are theoretically feasible.
  • There is a request for concrete calculations or sources related to these topics, but participants express a lack of knowledge about specific resources.

Areas of Agreement / Disagreement

Participants generally agree on the feasibility of estimating gravitational forces and calculating time dilation, but there is no consensus on specific methods or sources for these calculations.

Contextual Notes

Participants express uncertainty about the availability of concrete calculations and the specifics of the Schwarzschild solution, indicating limitations in their current knowledge and resources.

Ennio
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Is it possible to estimate the gravitational force of the center of a Galaxy (it could be Andromeda or the Milky way) to any point (such as a planet) of its Orbit? Furthermore is there such as Schwarzschild solution that calculates the time dilation of any point of an external Galaxy (e.g. Andromeda) to the earth? Thank you in adv.
 
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Ennio said:
Is it possible to estimate the gravitational force of the center of a Galaxy (it could be Andromeda or the Milky way) to any point (such as a planet) of its Orbit?

Sure. You find the mass contained within the region you're interested in defining as the center, and then you apply regular gravitational laws.

Ennio said:
Furthermore is there such as Schwarzschild solution that calculates the time dilation of any point of an external Galaxy (e.g. Andromeda) to the earth?

I don't know anything about a Schwarzschild solution, but calculating the amount of time dilation between ourselves and any other visible point is certainly possible in principle. I believe you can get a back of the envelope calculation that's reasonably accurate without too much difficulty.
 
Drakkith said:
Sure. You find the mass contained within the region you're interested in defining as the center, and then you apply regular gravitational laws.

Could you link me a concrete calculation from PhysicsForums or from an external source?
 
I would if I knew of a source that explicitly stated the calculations. But unfortunately I do not know of one. I just know the basics of how you would go about doing it.
 

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