Quantum gravity is a research area in theoretical physics that seeks a consistent, predictive framework unifying general relativity with quantum mechanics by quantizing the gravitational field. It investigates regimes where spacetime curvature and quantum effects are simultaneously significant, such as near singularities and at the Planck scale, and aims to resolve conceptual tensions including the problem of time, the nature of spacetime microstructure, and black hole information dynamics. Major approaches include string theory, loop quantum gravity, asymptotic safety, causal dynamical triangulations, and emergent gravity scenarios, each proposing distinct mathematical formalisms and testable phenomenological implications for high-energy, cosmological, or precision-gravity experiments.
Assistant Professor Haocun Yu is something of a scientific diplomat. In a recent Physical Review Letters publication, she and her colleagues show how a tabletop experiment can bring together two bedrock physics theories that ...
General Physics
Jun 8, 2026
2
58
A new Physical Review Letters study places constraints on the ER = EPR conjecture, showing that under the authors' assumptions, the conjecture would imply possible alterations to the hyperfine structure and effective charge ...
Black holes are regions in space where gravity is so strong that nothing, even light, can escape. Einstein's theory of general relativity breaks down inside black holes, either by the presence of a so-called "curvature singularity" ...
If you could take an apple and break it into smaller and smaller parts, you would find molecules, then atoms, followed by subatomic particles like protons and the quarks and gluons that make them up. You might think you hit ...
General Physics
May 14, 2026
7
253
Trying to solve quantum gravity is frustrating. We have made tremendous progress in quantum theory, but it seems that every time we find a new quantum technique, there's a reason it doesn't quite work with gravity. Take, ...
General Physics
May 13, 2026
3
279
Black holes live forever, at least according to general relativity. Once material crosses a black hole's event horizon, it is trapped forever, until the last day of cosmic time. But we know that isn't true. General relativity ...
Astronomy
May 11, 2026
4
38
Only about 5% of the universe is composed of normal matter that we can directly observe, while the remaining 95% is widely believed to consist of dark matter and dark energy. Paradoxically, however, the nature of these dark ...
The cosmological constant is the mathematical description of the energy that drives the ever-accelerating expansion of the cosmos. It's also the source of one of the most enduring and confounding problems in modern physics.
General Physics
Apr 20, 2026
21
587
In quantum physics, objects can exist in multiple states at the same time—a phenomenon known as quantum superposition, where a particle does not have a single definite value of position or momentum until it is measured. A ...
General Physics
Apr 14, 2026
1
35
One of the greatest mysteries of modern physics, the "black hole information paradox," might have finally found an elegant solution, and the answer could also reveal the origins of the mass of fundamental particles.
General Physics
Apr 3, 2026
8
398
