We all know that from the theory of general and special relativity that gravity is just an illusion that a body undergoes when it travels through the fabric of space-time, creating simultaneous depressions, that causes other bodies to be **attracted** to it.

But, just as a thought experiment, if we compare the force of gravity to one of the other fundamental forces, i.e. the Electro-Magnetic force, we try to think of a kind of a repulsive gravity. My questions it that, could Dark matter, or whatever that is trying to expand our universe be an example of this theory? I mean, could there be **negative** mass, and I don't means stuff like \(-5 kg\). That's irrelevant.

What I want to ask, is if there's something that does all the work and has the same properties of ordinary mass, but repels? I have heard and watched a couple of vids on this topic, and this really is kind of interesting...(for me, at least! :P).

Please share your comments and reviews to this theory.

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## Comments

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TopNewest@Abhineet Nayyar @Kalpak Shukla What is the probability that negative mass IS dark matter? Could negative mass be claculated via gravitational lensing?

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nobody knew \( i \) few centuries before us :P

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Hmm, this really IS interesting. I do not consider myself to know anything about space time, So I'll just apply basic Physics here.

So, the fact that this COULD be true has an explanation which goes something like this:

How can space time expand? Imagine spacetime to be a rectangle. Divide it into two parts. Let one be the Dark mass and one be the Non-dark mass and other stuff. Dark Mass : Non dark mass <1

So, one possible expansion reason is that the Dark mass part pushes away the other part,i.e. it repels.

So this does prove that a negative mass exists.

Second is that dark mass may have this property to just Push

itselfout so that the universe expands.So, both explanations are possible.

Now we wait unless someone who has immense knowledge on the subject sheds some light on the topic :P

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But wait a second....how do we even know that it is indeed dark matter that causes expansion? I mean we can just see the results and not the causes, can we?

Moreover, even if we could...what would you view as the properties of this negative mass...?

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Well yes. All I'm saying, that if it does, It IS a theoretical possibility.

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expectsmass to be negative, but it can be.The reason we haven't found it is what you just stated,

"DARK MATTER DOESN'T INTERACT LIKE ORDINARY MATTER".Log in to reply

Hence Dark Matter ≠ Negative mass.

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Second of all, saying that since dark matter shows gravitational lensing is really exaggerating stuff, as whenever we have seen lensing, we have been easily able to associate it with normal matter, so, it might just be that dark matter does not show lensing.

Thirdly, even if it is the dark matter that shows lensing, you can't say that it is negative mass just because ordinary matter shows lensing. It is the same as saying that no black hole exists, those are just stars, because stars show lensing, and we have seen it!

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If negative matter (matter which is associated and is supposed to have negative mass) was real and we were to observe negative matter, the results of lensing would not be the same.

You stated "Thirdly, even if it is the dark matter that shows lensing, you can't say that it is negative mass just because ordinary matter shows lensing ". I never said dark matter is negative mass (maybe you were trying to say negative matter), in fact i stated quite the contrary.

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You do know that we calculate the amount of dark matter by calculating the amount of lensing seen in various galaxies and stuff, right? How come we know that this is not due to a very dim celestial object which does not emit any radiation for us to detect. That's not impossible, is it?

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