B How close are we to uniting gravity and QM

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How much progression has physics made in uniting QM and gravity? Have we made any steps to unite them? have we discovered anything remotely related to it?
 
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Gravitational wave astronomy is an exciting field for quantum gravity. As they get more and more precise, we'll be able to see the exact energy spectrum released by colliding black holes and neutron stars. If gravity is quantized the same way light is, then short gravity waves should start showing us a spectrum that does not fit general relativity.
 
ChrisisC said:
How much progression has physics made in uniting QM and gravity? Have we made any steps to unite them? have we discovered anything remotely related to it?
Imho, it's still beyond the edge of the observable universe. (I.e., measure in terms of billions of LY.) :oldfrown:

But I'd be happy to be proven wrong within the next few decades (i.e., while I'm still around to see it). :biggrin:
 
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. Towards the end of the first lecture for the Qiskit Global Summer School 2025, Foundations of Quantum Mechanics, Olivia Lanes (Global Lead, Content and Education IBM) stated... Source: https://www.physicsforums.com/insights/quantum-entanglement-is-a-kinematic-fact-not-a-dynamical-effect/ by @RUTA
If we release an electron around a positively charged sphere, the initial state of electron is a linear combination of Hydrogen-like states. According to quantum mechanics, evolution of time would not change this initial state because the potential is time independent. However, classically we expect the electron to collide with the sphere. So, it seems that the quantum and classics predict different behaviours!

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