Recent content by jines

Physicists try to unite Quantum Mechanics and General Relativity. QM deals with three forces in nature (i.e., strong, weak , electromagnetism), while GR deals with geometry of space. How can one unite 3 forces and geometry? If one thinks of gravity as a force (not geometry), would one have a...

I need some clarity regarding black holes. First: A collection of dense gases. Due to the force of gravity, the particles fuse (nuclear fusion), and a star is born. Then: When the star "uses up" all its matter, (I guess nothing more to fuse?), it starts to die, and matter is squeezed...

I read somewhere that in the quantum world, inertial mass and gravitational mass are not the same. If mass is equivalent to energy, then even a light beam (photon particles) would have some mass, right? I thought that mass is just condensed energy. The bigger the condensed energy (i.e. more...

Thank you, jtbell. For purposes of clarification, would these two anti-parallel light beams (i.e, photons which are massless) be traveling on a "flat space-time", and they attract each other (Newtonian), or would these light beams be traveling on a curved spacetime, and this curvature is due...

Hi, I am not a trained scientist, but I have a deep interest in spacetime, gravity, quantum mechanics (including string theory) . Can one assume that if there is no mass (or matter), there is no gravity (or gravitational force)?