Towards a Better Determination of Big G Using a Multi-Mode Apparatus

The Newtonian gravitational constant, G, is a fundamental constant in nature not linked by any complete theories to other forces of nature. Compared to all other fundamental constants, G is known with the least precision. Over the last 200 years, its value has been repeatedly measured, and leading experiments across the globe have produced values which are incompatible with one another. In fact, compared to the most precise experiment, some measured values differ by up to 50 times the experimental uncertainty. Recently, two experiments have measured consistent results at the 12 ppm level. After examination of the methodology used in previous measurements, the research group at IUPUI, in collaboration with Humboldt State University, will use multiple approaches to determine G within a singular torsion pendulum apparatus. We expect to obtain a measurement at the 2 ppm level using these new methods. By continuing the use of a torsion pendulum apparatus, we also hope to better understand the current discrepancies among previous experimental results. This talk will be focused on the characterization of noise measurements of our experimental system as well as an update on the overall status of the project.