What Are Tensors, How Do They Relate to Modern Physics? Tensors are the backbone of modern physics. They are used in many fields, including mathematics, computer science, engineering, and especially in physics. Tensors have a few mathematical properties that make them perfect for the needs of physicists. For example, they can change their size to accommodate different dimensions. This is useful because our universe has three spatial dimensions and one time dimension. Tensors are also useful because they are less cumbersome than other representations...