New Theory Challenges Quantum Spacetime: Implications for Gravity and Measurement

A groundbreaking theory proposes that spacetime, as envisioned by Einstein, might not be quantum, challenging decades of assumptions in physics. This approach, published in respected journals, addresses the incompatibility between quantum theory and general relativity by suggesting that spacetime remains classical but experiences unpredictable shifts. Researchers at University College London (UCL) are spearheading this work, reframing the search for a quantum version of gravity into a postquantum theory of classical gravity. Instead of subtle effects predicted by standard quantum calculations, these fluctuations could be more pronounced, impacting the precision of weight measurements and the stability of atoms in superposition. A research group led by Professor Jonathan Oppenheim's former PhD students has outlined a method to test this theory by measuring a mass with extreme accuracy to detect unusual variations. Experiments include monitoring a precisely defined weight for unexpected changes and observing heavy atoms in two locations at once. These tests could determine if spacetime is quantum or classical, potentially settling a major divide between quantum laws and gravity. Professor Sougato Bose of UCL Physics & Astronomy emphasizes the importance of these experiments in understanding the fundamental laws of nature. The outcome could significantly impact our understanding of the cosmos and how we measure fundamental properties.