# Tag Info

### How do I calculate the mass of a moving proton?

Suppose we accelerate a proton to a speed $v$ then crash it into some large mass $M$ so that the proton comes to rest inside the large mass. Then we measure the speed $u$ that the large mass + proton ...
• 334k
Accepted

### Do massless particles have gravity?

And the curvature of space-time is due to massive objects. This is not exactly correct. The source of space-time curvature is the stress-energy tensor. The stress-energy tensor includes energy ...
• 68.7k

### Do massless particles have gravity?

Any energy or momentum-containing particle generates curvature in space-time. This is due to the fact that Einstein's field equation depends on the energy-momentum tensor $T_{\mu \nu}$ as  G_{\mu \...
Accepted

### Is mass defect of atoms considered when the mass of electron is measured within atoms?

It's correct that the mass of a hydrogen atom is different from the mass of a proton plus the mass of an electron, but this doesn't matter since this is not how the current value for the electron mass ...
• 334k

### Do massless particles have gravity?

It is not strictly true that the curvature of space-time is due to massive objects. The curvature of spacetime depends on the stress-energy tensor, which includes both mass-energy and momentum. The ...
• 432
Accepted

### How can positive energy fields negatively contribute to the mass?

Suppose you have a positive and a negative charge infinitely far apart. Each charge has a field around it and that field stores energy. The mass of the charged objects will include the energy of the ...
• 334k
1 vote

### Electromagnetic contribution to the mass of proton

The electromagnetic contribution to the proton-neutron mass difference is a tiny effect of $0.58 \pm 0.16$ MeV. The main contribution to $m_p-m_n$ is a QCD effect (due to the mass difference of up and ...
• 11
1 vote

### Magnetic Monopole mass-energy effect into Einstein-Field equations

Assuming Maxwell Electrodynamics, the effect is identical to an electric charge. For example, the solution of a charged black hole can also be considered for a black hole containing magnetic charge (...
• 9,601
1 vote

### Have information bits a mass-energy equivalence?

Glancing at the paper https://www.researchgate.net/publication/333751969_The_information_content_of_the_Universe_and_the_implications_for_the_missing_Dark_Matter from a holistic standpoint, and ...
• 2,798
1 vote

### Relationship between mass and the radius of curvature of space and time

What is the relationship between mass and the radius of curvature of space and time created due to the presence of the mass? It is not that simple. The curvature of space-time does not only depend on ...
• 27.6k

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