OPEN KNOWLEDGE / 12 FIELDS
Physics to understand.
Educational encyclopedia in the areas of the laboratory: from tensor geometry to QEI and quantum fields on a curved background. Terms, formulas, prerequisites, tasks and open sources.
The portal's Wikipedia is its own educational section, not an official Wikimedia project. The main educational texts of this version are in Russian; original sources are available in RU, EN and DE.
Physical constants
22 values, SI units and precision status.
Open the directory →02 / COMPUTECalculation laboratory
15 physics modules, scientific expressions and a journal.
Launch calculator →Choose a direction
Books and famous lectures →General relativity
Gravity as geometry: from the metric tensor and geodesics to Einstein's equations and horizons.
Explore the area →Semiclassical gravity
The classical metric interacts with the quantum average of the energy-momentum tensor.
Explore the area →QFT in curved spacetime
Quantum fields on non-stationary backgrounds: vacuum, particles, Hadamard state and anomalies.
Explore the area →Quantum energy inequalities
Negative energy is locally permissible, but its duration and averaging are limited by quantum theory.
Explore the area →Wormholes and quasi-black holes
Neck, flare-out, causality and necessary sources in idealized geometries.
Explore the area →Numerical relativity
Spacetime evolution, constraints, gauge selection, and convergence testing.
Explore the area →Spacetime topology
Global structure of the manifold, causal restrictions and the difference between topology and local curvature.
Explore the area →Einstein–Maxwell theory
Self-consistent interaction of gravitational and electromagnetic fields.
Explore the area →Quantum mechanics
States, operators, measurement and dynamics are the foundation for quantum field theory.
Explore the area →Compact-object astrophysics
White dwarfs, neutron stars, black holes and observed accretion.
Explore the area →Cosmology
Expansion of the Universe, FLRW metric, cosmological distances and observational limitations.
Explore the area →Mathematical tools
Tensors, manifolds, differential forms and variational principles for physics.
Explore the area →RECOMMENDED PATH
From basics to exploration
- Mathematics and quantum mechanics. Master vectors, operators, forms, and variational principles.
- General relativity and electrodynamics. Learn to work with metrics, curvature and physical units.
- QTP on the background and QEI. Review states, renormalization, and conditions of theorems.
- Models and verification. Check residuals and convergence; separate hypothesis from observation.