Interview, Fireside Chat
Lee Smolin: Quantum Gravity and Einstein's Unfinished Revolution | Lex Fridman Podcast #79
- Aiming to resolve the unfinished revolution connecting quantum theory and general relativity, the outlook anticipates future physics will shift from listing specific models to identifying underlying principles, with a full-on conference planned for the summer to unite distinct communities like string theory, loop quantum gravity, and causal sets.
- Sociological fragmentation among physicists is expected to diminish as younger scientists integrate disparate approaches and move away from historical arguments, while the broader community is predicted to transition from "naked emperor" dynamics toward ethical precepts of rigorous checking and reporting all results.
- Fundamental laws are projected to be temporally variable and subject to abrupt change, potentially evolving over time similar to species in biology, with the ground of physics described as only temporarily solid.
- The future trajectory involves a naturalist view to eventually fully explain consciousness and perception, though this is not yet achieved, alongside a prediction that humanity may reach the limits of cognitive understanding regarding reality in approximately 5,000 years, despite not being close to that limit currently.
- Theoretical expectations include viewing the "universe as a whole" as evolving to discover standard model parameters through cosmological natural selection, perceiving the real world as independent of human existence, and understanding space as an emergent property rather than a fundamental entity.
- Time is characterized as the continual creation of events where the future does not exist, contrasting with a past that extends back indefinitely, leading to the expectation that the definition of locality is false based on experimental tests over distances of tens or hundreds of kilometers.
- Current views reject the Many Worlds interpretation due to its failure to answer specific questions, the lack of precise definition regarding "branches" in infinite systems, and uncertainty among experts like Simon Saunders, David Wallace, and Harvey Brown regarding decision-theoretic approaches to probability.
- The measurement problem is identified as arising from contradictory temporal evolution paths in quantum mechanics based on the presence of measurement, while the assessment of string theory's status from 2006 remains largely valid except for an underestimation of applications to condensed matter via ADS-CFT.
- Significant risks include the unpredictability of fundamental laws changing without warning, the incomplete nature of current cognitive limits regarding reality, and the ongoing absence of a unified framework that resolves the contradictions in quantum mechanics or fully integrates the separate "hills" of the physics community.