Snowmass White Paper: Precision Studies of Spacetime Symmetries and Gravitational Physics

Understand

High-energy physics is primarily concerned with uncovering the laws and principles that govern nature at the fundamental level.

• Research in this field usually relies on probing the boundaries of established physics, an undertaking typically associated with extreme energy and distance scales.
• It is therefore unsurprising that particle physics has traditionally been dominated by large-scale experimental methods often involving high energies, such as colliders and storage rings, cosmological and astrophysical observations, large-volume detector systems, etc.
• However, high-sensitivity measurements in smaller experiments, often performed at lower energies, are presently experiencing a surge in importance for particle physics for at least two reasons.