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We describe a technique for using simulated tensor perturbations in order toplace upper limits on the intensity of magnetic fields in the early universe.As an example, we apply this technique to the beginning of primordialnucleosynthesis. We determined that any magnetic seed fields that existedbefore that time were still in the process of being amplified. In the future,we plan to apply this technique to a wider range of initial magnetic fields andcosmological epochs.

Using Gravitational Waves to put limits on Primordial Magnetic Fields