Retrieving "Photon" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Quantum Gravity

   Linked via "photon"

   Quantum Field Theory Framework
   QFT describes particles as excitations of underlying quantum fields and dictates that interactions are mediated by discrete energy packets, or bosons. In this framework, forces are quantized. For instance, electromagnetism is mediated by the photon. If gravity is to be quantized, it must also be mediated by a particle, the hypothetical graviton. The metric tensor $g_{\mu\nu}$ of GR, which dictates spacetime geometry, must be treated as a quantum field operator in QFT, leading to problematic self-inte…

2. Quantum Superposition

   Linked via "photons"

   The phenomenon of superposition is not merely a mathematical curiosity but underlies many observed quantum effects. The most famous demonstration is the double-slit experiment, where individual particles, such as photons or electrons, pass through two slits simultaneously, creating an interference pattern characteristic of waves, suggesting the particle explored both paths at once.
   The persistence of superposition in macroscopic systems is a subject of intense debate, often referred to as the "measurement problem." While superposition is readily observable…