In the realm of modern physics, two pillars stand tall: quantum theory and Einstein's theory of general relativity. However, these theories have long been at odds with each other, leaving scientists searching for a unifying explanation. Now, a radical theory has emerged from the minds of UCL physicists, challenging the consensus and offering a fresh perspective. This theory, known as the postquantum theory of classical gravity, suggests that spacetime itself may be classical, rather than governed by quantum theory. Join us as we delve into this groundbreaking theory, its predictions, and the proposed experiments to test its validity.

## The Clash of Theories: Quantum Mechanics vs. General Relativity

*Explore the fundamental conflict between quantum mechanics and general relativity, the two pillars of modern physics.*

Modern physics is built upon two pillars: quantum theory and Einstein's theory of general relativity. While quantum theory governs the behavior of the smallest particles, general relativity explains gravity through the bending of spacetime. However, these two theories have long been at odds with each other, presenting a major challenge for physicists.

The prevailing assumption has been that Einstein's theory of gravity needs to be modified to fit within the framework of quantum theory. This has led to the development of string theory and loop quantum gravity as potential candidates for a quantum theory of gravity.

However, a new theory has emerged from UCL physicists, challenging this consensus. The postquantum theory of classical gravity proposes that spacetime itself may be classical, not governed by quantum theory. This alternative approach modifies quantum theory instead of spacetime, resulting in intrinsic breakdowns in predictability mediated by spacetime.

## Unpredictable Fluctuations: The Consequences of the Postquantum Theory

*Discover the implications of the postquantum theory and its prediction of random and violent fluctuations in spacetime.*

The postquantum theory of classical gravity predicts that spacetime fluctuations are larger and more unpredictable than envisioned under quantum theory. These fluctuations can have significant consequences for our understanding of the universe.

One of the proposed experiments to test this theory involves measuring the weight of a mass with extreme precision. If the fluctuations in the measurements exceed the required mathematical consistency, it would provide evidence against the theory.

Furthermore, the theory challenges the prevailing notion that information cannot be destroyed. It offers a potential resolution to the black hole information problem by allowing for the destruction of information due to the breakdown in predictability.

## Testing the Theory: Weighing Mass and Exploring Superposition

*Learn about the proposed experiments to test the postquantum theory, including measuring the weight of a mass and observing superposition.*

In order to test the postquantum theory of classical gravity, scientists have proposed an experiment involving the precise measurement of the weight of a mass. By monitoring the fluctuations in the weight of the mass over time, researchers can gather data to support or refute the theory.

Additionally, the theory suggests that objects like atoms can be put in a superposition of being in two different locations. By testing how long a heavy atom can remain in this superposition state, scientists can further explore the nature of spacetime and its potential quantum or classical properties.

These experiments, if successful, could provide valuable insights into the nature of gravity and the fundamental laws of the universe.

## A Bet for the Future: The Outcome and Implications

*Discover the 5000:1 odds bet between proponents of different theories and the potential implications of the experiment's outcome.*

As the proposed experiments to test the postquantum theory of classical gravity unfold, the outcome holds significant implications for our understanding of the universe.

Professor Jonathan Oppenheim, the proponent of the postquantum theory, has placed a 5000:1 odds bet with Professor Carlo Rovelli and Dr. Geoff Penington, leading proponents of quantum loop gravity and string theory respectively. The outcome of the experiment or any other evidence confirming the quantum vs. classical nature of spacetime will determine the winner of the bet.

If the postquantum theory is validated, it would revolutionize our understanding of gravity and quantum mechanics, opening up new avenues for exploration and potentially resolving long-standing conflicts in physics.