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Quantum Gravity and the Problem of Time
Christopher Isham published many papers in the early 1970s but one of his first key publications came in 1984 with "Quantum Gravity and the Problem of Time". This work provided a deep analysis of the problem of time in quantum gravity and influenced subsequent research in the field. Isham, Christopher J. "Topological and Global Aspects of Quantum Theory." 1984. -
Topos Theory and Quantum Physics
Along with Jeremy Butterfield, Isham introduced the application of topos theory to quantum physics, proposing a new logical and mathematical framework for understanding quantum mechanics. At this time, he published the title listed in the citation below: Isham, Christopher J., and Jeremy Butterfield. "A Topos Perspective on the Kochen-Specker Theorem: I. Quantum States as Generalized Valuations." International Journal of Theoretical Physics, vol. 37, no. 11, 1998, pp. 2669-2733. -
Quantum logic and the histories approach to quantum theory
Isham published on quantum measure theory, which generalizes classical measure theory to the quantum domain, providing new insights into quantum probability. Isham, Christopher J. "Quantum Logic and the Histories Approach to Quantum Theory." Journal of Mathematical Physics, vol. 35, no. 5, 2001, pp. 2157-2185. -
What is a thing?
In 2011, Isham partnered with Andreas Doring in a detailed exploration of how topos theory can be applied to the foundations of physics. Isham, Christopher J., and Andreas Döring. "What is a Thing?: Topos Theory in the Foundations of Physics." In New Structures for Physics, edited by Bob Coecke, Springer, 2011, pp. 753-940. -
Is the Universe Religiously Ambiguous?
Throughout his career, Isham has been know to maintain a dialogue between science and religion. Below is a video of a discussion he has on the podcast Closer to Truth where he discusses the ambiguity of religion in the universe. https://youtu.be/aYarYoDxuks?si=k_Gvq7moJ43T-h08