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From the equivalence principle we know that the gravitational and inertial mass of a body have same values. But I'm just wondering what would the universe be like if they had different values?

Qmechanic
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soumya
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    This question got downvoted within 10 minutes. It doesn't deserve it. It is not "If the universe was different, what would it be like?" That doesn't have a good answer. This is specific. People have done experiments to see if the two masses are the same. What would we expect to see if they were different? – mmesser314 Dec 18 '17 at 13:58
  • You can find more here. https://physics.stackexchange.com/q/9321/37364 – mmesser314 Dec 18 '17 at 14:01
  • @mmesser314 To be fair, it's not clear to me that he is saying "different from each other" or just "different" in general. The question isn't really clear enough IMO. – JMac Dec 18 '17 at 16:05
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    I mean their values were different. – soumya Dec 18 '17 at 16:09
  • @JMac Within the context of the question, it is very clear that OP is asking how the universe would be different if the gravitational and inertial mass of a single body were different from each other. This is a well-posed question and I see no reason to state it as unclear or close it. – Bob Knighton Dec 18 '17 at 16:25
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    @BobKnighton Read the edit history, question wasn't clear originally. – JMac Dec 18 '17 at 16:26
  • @JMac My bad. Good edits. – Bob Knighton Dec 18 '17 at 16:27
  • Which mass is larger, by how much? Or maybe those aspects are irrelevant. Would stars even form or be long-lived since accelerations would be mass number dependent and hydrogen would gather at a different rate than helium and lithium? – Bill N Dec 18 '17 at 16:38
  • Interesting question. Bummer that it got closed. Perhaps the theorized universe would then be more like we see it. Allegedly DARPA funded University of Plymouth physicist Mike McCulloch proposed this scenario as an alternative to dark matter for reconciling differences between the equivalence principle and cosmological observations. – Louis Langholtz Jan 20 '19 at 06:55

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