M. Ronen Plesser, Professor of Physics
My research is in String Theory, the most ambitious attempt yet at a comprehensive theory of the fundamental structure of the universe. In some (rather imprecise) sense, string theory replaces the particles that form the fundamental building blocks for conventional theories (the fields, or wave phenomena, we observe are obtained starting from particles when we apply the principles of quantum mechanics) with objects that are not pointlike but extended in one dimension – strings. At present, the theory is not precisely formulated, as we still seek the conceptual and technical tools needed. The structures we do have in hand suggest that, when formulated precisely, the theory will provide a consistent framework encompassing the two greatest achievements of twentieth century theoretical physics: Einstein’s general theory of relativity, which describes gravitational forces objects in terms of deformations of the geometry of spacetime; and quantum mechanics, a model of fundamental physics in which microscopic objects exhibit the properties of particles under some circumstances and those of waves under others. Both of these theories have been tested with extraordinary precision and yield predictions that agree with our observations of the physical universe. Relativistic effects are manifest at the largest scales in the universe, in the interactions of stars, galaxies, etc. The differences between a quantum mechanical description and a classical nineteenth century description of these objects are so small they can be neglected. Quantum effects dominate at the smallest scales – atoms and their constituents. In this realm, the effects of gravitation can be completely neglected. And yet, under extreme conditions of density, such as may obtain in the final instant of the evaporation of a black hole, both kinds of effects are important. A universal theory of physics thus requires a consistent quantum theory of gravity. Thus far, string theory is the most promising candidate for producing such a theory. Investigations of this theory have already yielded rich insights, and continue to produce more.
My own research centers on the crucial role played in the theory by geometric structures. There is an obvious role for geometry in a theory that incorporates gravitation, which as discussed above is tantamount to the geometry of spacetime. Related to this are several other, less obvious, geometric structures that play an important role in determining the physics of the theory. Indeed, advances in mathematics and in the physics of string theory have often been closely linked. An example of how the two fields have interacted in a surprising way is the ongoing story of mirror symmetry.  Contact Info:
Teaching (Fall 2022):
 PHYSICS 522.01, SPECIAL AND GENERAL RELATIVITY
Synopsis
 Physics 205, MW 03:30 PM04:45 PM
 Education:
Ph.D.  Harvard University  1991 
M.A.  Harvard University  1988 
BS  Tel Aviv University  1981 
 Specialties:

Theoretical particle physics and string theory
 Research Interests: String Theory and Quantum Field Theory
 Current Ph.D. Students
(Former Students)
 Postdocs Mentored
 Recent Publications
(More Publications)
 Marco Bertolini, Ilarion V. Melnikov, M. Ronen Plesser, Fixed points of (0,2) LandauGinzburg renormalization group flows and the chiral algebra
(Preprint, June, 2021) [2106.00105] [abs]
 Bertolini, M; Plesser, MR, (0,2) hybrid models,
Journal of High Energy Physics, vol. 2018 no. 9
(September, 2018), Springer Nature America, Inc [doi] [abs]
 Jockers, H; Katz, S; Morrison, DR; Plesser, MR, SU(N) Transitions in MTheory on Calabi–Yau Fourfolds and Background Fluxes,
Communications in Mathematical Physics, vol. 351 no. 2
(April, 2017),
pp. 837871, Springer Nature [doi] [abs]
 Aspinwall, PS; Plesser, MR; Wang, K, Mirror Symmetry and Discriminants
(February, 2017) [abs]
 Aspinwall, PS; Plesser, MR, General mirror pairs for gauged linear sigma models,
Journal of High Energy Physics, vol. 2015 no. 11
(November, 2015),
pp. 133, Springer Nature [doi] [abs]
