| 11. | He was project director of the Elementary Particle Theory Group, DOE from 1969 to1993.
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| 12. | Despite being similar to later particle theories, Lucretius's views were not generally accepted.
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| 13. | When Caswell resumed his studies at Princeton, he chose to work in elementary particle theory.
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| 14. | In particular, no successful theory of gravitation based on a particle theory has yet been proposed.
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| 15. | Those areas were condensed matter theory, particle theory, statistical mechanics, and nuclear and relativistic astrophysics.
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| 16. | In 1905, Einstein explained this puzzle by resurrecting the particle theory of light to explain the observed effect.
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| 17. | There is evidence to refute the wave theory of light, and also evidence to refute the particle theory.
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| 18. | By the time he had received his Ph . D ., he had published several papers on particle theory.
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| 19. | His research interests also include cosmology, elementary particle theory, the foundations of quantum mechanics, and theoretical biology.
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| 20. | But when asked about his greatest worry for the project, he steers clear of advanced particle theories or new dimensions.
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