If there are antiparticles, why is there no antigravity?

[Barbllm]

We know the four fundamental forces that shape our world: the strong nuclear force, the weak nuclear force, electromagnetism, and gravity. Everything experiences the effects of gravity. But why is there no "antigravity" if there are particles and antiparticles?

 

Is dark energy "antigravity"?

 

Why is there no such thing as "antigravity"?

[Dages]

We don't know how gravity works yet. Particles or not, etc. It's generally considered to be linked with the shape of our physical reality, iirc

[Barbllm]

I wonder if it has something to do with particles/antiparticles having mass. 

 

 

[Qapla]

Since there is gravity here on earth but no gravity in space - is it possible space is full of antigravity?

 

[Lewis]

There is gravity everywhere in space, objects are constantly falling towards large body planets like Jupiter, earth etc and stars, Galaxies are held together by strong gravitational forces.

[carlos]

16 hours ago, Barbllm said:

We know the four fundamental forces that shape our world: the strong nuclear force, the weak nuclear force, electromagnetism, and gravity. Everything experiences the effects of gravity. But why is there no "antigravity" if there are particles and antiparticles?

 

The article you link explains it very well. Particles and antiparticles are identical, except they have opposite electrical charges. An electron has negative electrical charge. An antielectron has the same structure but with positive charge. 

 

Yet gravity doesn't have anything to do with electromagnetism and is not affected by it. Gravity makes mass attract other mass, indifferently of its electrical charge. Since antiparticles have the same mass as particles, they are affected the same by gravity.

 

No particles have ever been found that have negative mass, and if you think about it that's a very weird concept. While it can be theorized about, it doesn't seem our universe is built to feature antigravity.

 

As for dark energy, we don't have the slightest idea of what it is, or even if it really exists. Dark energy is a speculation to explain why galaxies don't behave in the way physicists expected, but it has never been detected or measured. Maybe it exists, or maybe it doesn't and there is another explanation for the discrepancy. Or maybe their calculations are flawed and there are other factors we don't have any idea about.