The IKKT matrix model as a possible basis for 3+1-dimensional (quantum) gravity & cosmology

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• Harold Steinacker, University of Vienna
• Wednesday 15 November 2023, 14:00-15:00
• MR2.

If you have a question about this talk, please contact Sergii Strelchuk.

The IKKT matrix model was introduced as a constructive definition of (some corner of) IIB string theory. We show that it also provides a mechanism for 3+1-dimensional gravity on suitable space-time branes, without requiring compactification of target space. The Einstein-Hilbert action is obtained as a quantum effect, which is expected to dominate in an intermediate regime. At very long distances, the bare Yang-Mills-type action is dominant, leading to significant deviations from general relativity at cosmic scales. Some aspects of this emergent gravity theory are discussed, including the appearance of higher-spin fields.

This talk is part of the Theoretical Physics Colloquium series.

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