Geophysical constraints on mirror matter within the Earth

Abstract

We have performed a detailed investigation of geophysical constraints on the possible admixture of mirror matter inside the Earth. On the basis of the preliminary reference Earth model—the “standard model” of the Earth’s interior—we have developed a method which allows one to compute changes in various quantities characterizing the Earth (mass, moment of inertia, normal mode frequencies, etc.) due to the presence of mirror matter. As a result we have been able to obtain for the first time the direct upper bounds on the possible concentration of the mirror matter in the Earth. In terms of the ratio of the mirror mass to the Earth mass a conservative upper bound is (Formula presented) We then ..