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.

## Comments

Sort by:

TopNewest@Abhineet Nayyar @Kalpak Shukla What is the probability that negative mass IS dark matter? Could negative mass be claculated via gravitational lensing? – Hilary Sackett · 3 months, 3 weeks ago

Log in to reply

nobody knew \( i \) few centuries before us :P – Brilliant Member · 8 months ago

Log in to reply

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 – Mehul Arora · 1 year, 7 months ago

Log in to reply

Moreover, even if we could...what would you view as the properties of this negative mass...? – Abhineet Nayyar · 1 year, 7 months ago

Log in to reply

– Mehul Arora · 1 year, 7 months ago

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

– Kalpak Shukla · 1 year, 7 months ago

The part where people get confused is when it comes to dark matter and dark energy. Dark matter has nothing to do with the expansion of our universe! Dark energy is what is the reason for the expansion of our universe and also is considered to be 70% of what our universe is made. Negative mass is not a possibility because mass is defined as the amount of matter in a particular volume (and no antimatter does not mean matter having negative mass). The term "Dark matter" does not mean that it is somehow opposite of matter. It is termed so as it had gravitational properties and had mass but is not visible by any other means except for the gravitational lensing that it creates.Log in to reply

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". – Abhineet Nayyar · 1 year, 7 months agoLog in to reply

Hence Dark Matter ≠ Negative mass. – Kalpak Shukla · 1 year, 7 months ago

Log in to reply

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! – Abhineet Nayyar · 1 year, 7 months ago

Log in to reply

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. – Kalpak Shukla · 1 year, 7 months ago

Log in to reply

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? – Abhineet Nayyar · 1 year, 7 months ago

Log in to reply