# Does a 4TeV particle at LHC weight more?

## Recommended Posts

Does relativistic mass possess gravitational (passive) mass?

Do you know any link that describes an experiment at CERN which proves or disproves the increase of weight in particle at near C?

##### Share on other sites

Mass and energy-momentum both contribute to gravitation.

If something has translational KE, the mass does not increase
Mass and KE are separate contributions to the total energy; E2 = p2c2 +m2c4

##### Share on other sites

I remember a study from about 8 years ago showing that relativistic particles in accelerator free fall just like they should, i.e. like everything else in the Earth gravity, with the same acceleration. I think it means that their weight increased accordingly to their relativistic mass.

##### Share on other sites

I remember a study from about 8 years ago showing that relativistic particles in accelerator free fall just like they should, i.e. like everything else in the Earth gravity, with the same acceleration. I think it means that their weight increased accordingly to their relativistic mass.

Rate of freefall doesn't depend on the mass.

##### Share on other sites

13 minutes ago, swansont said:

Rate of freefall doesn't depend on the mass.

Right. That was the point of this test. That it still doesn't depend on the mass.

##### Share on other sites

Right. That was the point of this test. That it still doesn't depend on the mass.

So how do you tell if the weight varied?

##### Share on other sites

1 hour ago, swansont said:

So how do you tell if the weight varied?

The free fall acceleration doesn't depend on mass because, in old terms, "gravitational mass" equals "inertial mass". Inertial mass is "relativistic mass". Since the inertial mass changes with velocity, for the free fall acceleration not to change the gravitational mass needs to change. Weight is the gravitational mass times the acceleration. Thus, the weight needs to change.

## Create an account

Register a new account