All Questions
12
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When does Newtonian physics fail?
When does Newtonian physics fail?
The answer by Zo the Relativist to the question How accurate is Newtonian Gravity? includes the statement:
The key point is that Newtonian physics fails when, ...
5
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1
answer
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ONLY non-relativistic limit of general relativity
From my study of GR I learnt that to reach the “Newtonian” limit of the Einstein field equation we have to assume:
weak field $g_{\mu\nu} = \eta_{\mu\nu} + \epsilon h _{\mu\nu}$ with $\epsilon <&...
- 191
2
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3
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Can we construct a logically self-consistent relativistic theory of gravity just by tweaking EM?
This question considers a modification of classical E&M where we simply reverse the relative sign in Maxwell's equations and change the "$q$" in the Lorentz force law to an "$m$&...
- 48.4k
3
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1
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Numerical solution to the relative gravitational time dilation of induced dipolar gravitational fields
In gravitoelectromagnetism, an approximation to general relativity in the weak field limit, Einstein's equations simplify into a form very similar to Maxwell's equations. In this field, traditional ...
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1
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What is the relationship between curved vs flat and Lorentzian vs Newtonian?
Poisson's equation $\Delta \Phi = 4 \pi G \rho$ is not Poincare invariant, hence the need for a new theory of gravity after Special Relativity (SR).
The motivation for gravity as curvature in ...
- 591
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2
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Do hot gasses actually weigh more than cold gasses in SR?
I was reading:
https://plato.stanford.edu/entries/equivME/#PhysMassEnerEqui
Where they begin to discuss a weighing a relativistic gas against a cold gas.
The idea is that the relativistic gas ...
- 2,989
7
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1
answer
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Are there good reasons why special relativity should motivate geometrised gravity in a way that Newtonian mechanics does not?
I have studied a bit of Newton Cartan theory recently, the geometrised version of Newtonian gravity in which gravity is due to the curvature of spacetime, but is Newtonian (simultaneity is absolute).
...
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1
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Help with equations of motion
Important note:
The reference system is the Geocentric Celestial Reference System (GCRS) and the coordinate time $t$ is the independent variable. More details can be found in my other question.
I ...
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3
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Newton's gravity vs Einstein's gravity
Hello so if i were to simplify the difference between gravity as seen from Newton and gravity as seen from Einstein, could i say that Einstein's gravity is just adding the fact that gravity does not ...
2
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3
answers
503
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Classical physics in curved space
I'm trying to learn General Relativity. As a stepping-stone between classic (Newtonian) physics and complete relativity, imagine a universe where space is curved, but time is perfectly flat. Also, the ...
1
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0
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Will relativistic glider cause lower gravitational force in Newtonian gravitation?
In the articles The relativistic glider and The relativistic glider revisited, the relativistic glider is proposed where a quasi-rigid body can slow down its fall under gravity without any reaction ...
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4
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Link between Special relativity and Newtons gravitational law
If I make the two statements:
General relativity is an extension of special relativity that accounts for gravity.
Newton's law of gravitation is a special case of general relativity for when the ...
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