WOW.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. Spin angular momentum of light - Wikipedia

   en.wikipedia.org/wiki/Spin_angular_momentum_of_light

   The general expression for the spin angular momentum is [1] where is the speed of light in free space and is the conjugate canonical momentum of the vector potential . The general expression for the orbital angular momentum of light is. where denotes four indices of the spacetime and Einstein's summation convention has been applied.

3. Photon epoch - Wikipedia

   en.wikipedia.org/wiki/Photon_epoch

   In physical cosmology, the photon epoch was the period in the evolution of the early universe in which photons dominated the energy of the universe. The photon epoch started after most leptons and anti-leptons were annihilated at the end of the lepton epoch, about 10 seconds after the Big Bang. [1] Atomic nuclei were created in the process of ...

4. Soft photon - Wikipedia

   en.wikipedia.org/wiki/Soft_photon

   Soft photon. In particle physics, soft photons are photons having photon energies much smaller than the energies of the particles participating in a particular scattering process, and they are not energetic enough to be detected. Such photons can be emitted from (or absorbed by) the external (incoming and outgoing) lines of charged particles of ...

5. Two-photon absorption - Wikipedia

   en.wikipedia.org/wiki/Two-photon_absorption

   Two-photon absorption. Schematic of energy levels involved in two photons absorption. In atomic physics, two-photon absorption ( TPA or 2PA ), also called two-photon excitation or non-linear absorption, is the simultaneous absorption of two photons of identical or different frequencies in order to excite an atom or a molecule from one state ...

6. Photon mapping - Wikipedia

   en.wikipedia.org/wiki/Photon_mapping

   Photon mapping. In computer graphics, photon mapping is a two-pass global illumination rendering algorithm developed by Henrik Wann Jensen between 1995 and 2001 [1] that approximately solves the rendering equation for integrating light radiance at a given point in space. Rays from the light source (like photons) and rays from the camera are ...

7. Virtual photon - Wikipedia

   en.wikipedia.org/wiki/Virtual_photon

   Virtual photon. Virtual photons are a fundamental concept in particle physics and quantum field theory that play a crucial role in describing the interactions between electrically charged particles. Virtual photons are referred to as "virtual" because they do not exist as free particles in the traditional sense but instead serve as intermediate ...