Nuclear structure
Understanding the structure of the atomic nucleus is one of the central challenges in nuclear physics. This article is written from a nuclear physics perspective; as such, it is suggested that a casual reader first read the main nuclear physics article. Contents 1 The liquid drop
Kepler problem in general relativity
The Kepler problem in general relativity is to determine the motion of two spherical bodies interacting with one another by gravitation , as described by the field equations of general relativity . Solving the Kepler problem is essential to calculate the bending of light by gravity and the
Quantum field theory
In perturbative quantum field theory, the forces between particles are mediated by other particles. The electromagnetic force between two electrons is caused by an exchange of photons . Intermediate vector bosons mediate the weak force and gluons mediate the strong force . There is currently
Carl Sagan
Sagan became world-famous for his popular science books and for the award-winning 1980 television series Cosmos: A Personal Voyage , which he narrated and co-wrote. [ 2 ] A book to accompany the program was also published. Sagan also wrote the novel Contact , the basis for the 1997 film
Simulated reality
This is quite different from the current, technologically achievable concept of virtual reality . Virtual reality is easily distinguished from the experience of "true" reality; participants are never in doubt about the nature of what they experience. Simulated reality, by contrast, would be
Weakly interacting massive particles
In astrophysics , weakly interacting massive particles, or WIMPs, are hypothetical particles serving as one possible solution to the dark matter problem. These particles interact through the weak nuclear force and gravity , and possibly through other interactions no stronger than the weak
Two-body problem in general relativity
The two-body problem in general relativity is to determine the motion and gravitational field of two bodies interacting with one another by gravitation , as described by the field equations of general relativity . Solving the Kepler problem is essential to calculate the bending of light by
Fundamental interaction
In physics , fundamental interactions (sometimes called interactive forces ) are the ways that the simplest particles in the universe interact with one another. An interaction is fundamental when it cannot be described in terms of other interactions. The four known fundamental interactions
Virtual particle
In physics , a virtual particle is a particle that exists for a limited time and space, introducing uncertainty in their energy and momentum due to the uncertainty principle . Because energy and momentum in quantum mechanics are time and space derivative operators , then due to Fourier transforms
Matter
For much of the history of the natural sciences people have contemplated the exact nature of matter. The idea that matter was built of discrete building blocks, the so-called particulate theory of matter , was first put forward by the Greek philosophers Leucippus (~490 BC) and Democritus
