International Journal of Physics, 2014, Vol. 2, No. 5, 158-164 Available online at http://pubs.sciepub.com/ijp/2/5/5 © Science and Education Publishing DOI:10.12691/ijp-2-5-5 Unified Field Theory and Foundation of Physics Zhiliang Cao 1,2,* , Henry Gu Cao 3 1 Wayne State University, 42 W Warren Ave, Detroit 2 Shanghai Jiaotong University, Shanghai, China 3 Northwestern University, Evanston, IL 60208, USA *Corresponding author: williamcao12252000@yahoo.com Received September 09, 2014; Revised September 20, 2014; Accepted September 25, 2014 Abstract The paper "Unified field theory" (UFT) [1] opened a new chapter of physics. The main model of UFT is Torque Grids that unify Space, Time, Energy and Force. The configuration of invisible particles [2] and structure of the grand universe [3] can be logically induced. Visually, the universe can be modeled as single Torque Grids’ hierarchy. A simple UDP Java program can be used to prove the space-time-energy-force relationship predicted by the unified field theory and explain why the continents are drifting [4]. One of the applications of UFT is to predict the nuclei topologies [5] of each element. Physics, "knowledge of nature", is defined as a natural science that involves the study of matter and its motion through space and time, along with related concepts such as energy and force. UFT gives a better definition of Physics: “A natural science that involves the study of motion of space-time- energy-force to explain/predict the motion, interaction and configuration of matter.” Keywords: nuclear physics, particle physics, unified field theory, astronomy, GPS, atomic clock Cite This Article: Zhiliang Cao, and Henry Gu Cao, “Unified Field Theory and Foundation of Physics.” International Journal of Physics, vol. 2, no. 5 (2014): 158-164. doi: 10.12691/ijp-2-5-5. 1. Introduction Unified Field Theory (UFT) [1] physically models the world using Torque Grids that are invisible but understandable. As Physics progresses, it focuses more on invisible particles [2] and the unreachable grand universe [3] as visible matter is studied theoretically and experimentally. The old models focus on visible matter, such as particles, and celestial objects. These models limit themselves to tangible things that failed to serve as the fundamental basis of Physics. The Torque Grid model is logical and self-evident. The concept of space, time, energy and force reflected in the model are most fundamental and physical. UFT covers all levels of physics, from the most basic concept to the most advanced theory. It derives physics equations one by one using space-time-energy-force in the model of Torque Grid. UFT develops the theories firmly on the foundation of space-time-energy-force with help of the Torque Grid model. The relationship between space and time is described in Relativity; however, UFT claims that space and time are inseparable. Without time, space has no meaning in Physics, since it requires time to measure motion in space. Similarly, without space, time has no Physics meaning, since space is needed to measure motion in time. Space and time still have no meaning if there are no differentials in space-time. Energy is the differential. In UFT, there is no true void. Energy in space-time is modeled as distortions. UFT is a study of fields, which represent forces in space. Therefore, force is a fundamental concept in UFT. Visually, space is modeled as Grids, energy is modeled as strings, time is modeled as light speed twisting movement of strings, and force is modeled as Grids’ resistance to the distortion. Finally, the model becomes Torque Grids. UFT does not try to prove the existence of Torque Grids experimentally and there is no difference between border of the Grid and the internal part of the Grid. Therefore, physical Torque Grids do not exist. Fortunately, even though they are not tangible, they are understandable. Torque Grids model can explain the existing theory and make useful predictions of motion, interaction and configuration of matter. 2. Torque and Grid As a natural science that involves the study of motion of space-time-energy-force, UFT studies arbitrary motion in 3D space and time. The directions of an arbitrary 3D movement are changing and correlated. There are two possible movements, S twist and Z twist. Other than twist movements, there are straight line and circular movements as well, but straight line is a 1D movement and circular movement is a 2D movement, only the following twists are true 3D movements: The Twist movements are called Torques. In the Figure 1, the left image is a tightening Torque, while the one on the right is a loosening Torque. "Tightening" and "Loosening" are the two different directions of Torques. The Torque movement appears in everyday life. For