Theories of Everything with Curt Jaimungal Fay Dowker: Causal Set Theory as Quantum Gravity's Best Candidate
Jun 26, 2024
Fay Dowker, a renowned Professor of theoretical physics, dives into her groundbreaking work on causal set theory and its critical link to quantum gravity. She discusses the dichotomy between general relativity and quantum mechanics, addressing complexities like cosmic constants and dark energy. Fay also humorously intertwines consciousness with quantum theories, probing the nature of time. Moreover, she shares insights on the challenges and future of theoretical physics, urging newcomers to engage boldly in scientific discourse.
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Quantum Non-Locality in Time
- Dowker views quantum mechanics as non-local in time, not space.
- Influences can "jump" across time within the future light cone, without affecting intermediate points, respecting causality.
Quantumness: Interference Between Histories
- Quantum theories, unlike classical ones, exhibit interference between histories when calculating event measures.
- This interference, seen in phenomena like the double-slit experiment, is a hallmark of quantumness.
Predicting Accelerated Expansion
- Raphael Sorkin's prediction of accelerated cosmic expansion, using causal set theory, pre-dated its observational confirmation.
- This prediction, including the varying cosmological constant's order of magnitude, bolstered confidence in the theory.