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Modern Theoretical Physics

Modern theoretical physics considers topics such as quantum mechanics and theory, applications in atomic, nuclear, particle and condensed matter physics, as well as theories first proposed by Einstein such as special relativity and general relativity. While some modern theories of physics have gained general acceptance in the scientific community and have been demonstrated to be accurate, others remain unproven theories for which there may be circumstantial evidence but lack definite proof.
  1. Special Relativity and General Relativity

    • Quantum physics expands on Einstein's theories of special and general relativity.

      Einstein's theory of special relativity describes the motion of particles moving at close to the speed of light. Newton's laws are still valid as an accurate approximation of objects moving at everyday speeds, and while Newton's laws are involved in the movement of seen objects common on the earth, the modern laws of physics that Einstein proposed do not necessarily affect our everyday lives. "E equals mc-squared" is the most well-known example of Einstein's theory of special relativity, first proposed in 1905. The University of California, Riverside, Department of Mathematics describes Einstein's theory of general relativity (1916) as explaining "gravity as the curvature of spacetime." Einstein's theories are still essentially valid today and they merge into the field of quantum physics to form a unified theory of quantum gravitation.

    Quantum Entanglement

    • A photon is an elementary particle or basic unit of light. When an original photon splits into two photons, the resulting photon is considered to be "entangled" with the first photon. The first photon affects the activity of the second photon. Elementary particles are considered to be entangled even if they are not in physical contact. If one particles causes another particle to take on a complementary value, as an example, and an original particle causes a secondary particle to spin in the opposite direction it is spinning, the pair is said to be entangled.

    Dark Energy

    • Dark energy correlates with the acceleration of the expansion of the universe.

      In theory, dark energy describes the energy that permeates all of space. Dark energy is believed to increase the acceleration of the expansion of the universe, that is, the universe is expanding at an ever-increasing pace. The continuous expansion of the universe was first hypothesized in 1927 and was an outgrowth from the general relativity theory. Scientists believe that dark energy accounts for 74 percent of the energy in the universe. The National Radio Astronomy Observatory, a facility of the National Science Foundation, states that "Measuring the equation of state of dark energy is one of the biggest efforts in observational cosmology today."

    Black Hole Thermodynamics

    • Matter and light cannot escape the gravitational force of black holes.

      Black holes are not empty space; rather, they are areas where a great amount of matter is packed into a small area. If you were to take the sun and condense it into an area the size of New Jersey, you'd get a good idea of the scales of mass involved with black holes. In black hole thermodynamics, the laws of thermodynamics are harmonized with black hole event horizons. A black hole event horizon is the outer boundary of the black hole, where matter and light cannot escape the gravitational force of the black hole, and plunge inward.


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