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uncertainty principle
See Heisenberg's uncertainty principle
ultraviolet
Variety of electromagnetic radiation with frequencies between a few and a few hundred quadrillion oscillations per second, corresponding to wave-lengths ...
tunnel effect
A quantum mechanical phenomenon that can be pictured as follows. Imagine a ball rolling towards a hill: Leaving quantum effects aside (in other words, in ...
tritium
Variety of hydrogen in which the atomic nucleus contains two neutrons and a proton. In ordinary hydrogen, the nucleus consists of a single proton; in heavy ...
triangle
In a plane and other flat space: Geometrical object consisting of three points ("vertices") with three connecting straight lines. The definition can be made ...
time dilation
In special relativity: From the point of view of an observer (more precisely: an inertial observer), a moving clock goes slower than an identically built clock ...
time
It is a fact of life that not all events in our universe happen concurrently - instead, there is a certain order. Defining a time coordinate or defining time, ...
tidal effects
Idealized situations apart, the gravitational influences acting on an object depend on the object's position. Take two small objects in the neighbourhood of a ...
thermodynamic equilibrium
A physical system is in thermodynamic equilibrium if its energy is distributed evenly among all the different ways in which its components can move or vibrate ...
thermal radiation
In a narrow sense: synonym for infrared radiation. In a more general sense: The electromagnetic radiation emitted by every body with non-zero temperature due ...
thermal motion
What we call heat in everday life corresponds to disordered motion of the microscopically small constituents of matter (say, atoms or molecules) - one example ...
thermal energy
The energy contained in the disordered motion of a body's constituents - for instance, the energy of the disorderly motion of the atoms or molecules of a gas, ...
test particles
In the context of gravity: body whose mass is so small that it can be used to probe the gravitational influences of ther bodies, as its own gravitational field ...
TeV
See electron volt
temperature
In systems consisting of many particles, be they solid bodies, fluids or gases, the constitutents are in constant, chaotic motion: the atoms in a solid crystal ...
Système International d'Unités
See SI, International System of Units
Syracuse University
Research university (enrolment ca. 20,000) in New York State. Research topics of the physics department include classical and quantum gravity, cosmology and ...
synchrotron radiation
Electromagnetic radiation produced when electrically charged particles (for instance, electrons) are made to follow a curved trajectory in a particle ...
synchrotron
A particle accelerator, in which particles are accelerated with the help of electric fields, while strong magnetic fields keep them on track (the fact that ...
symmetry
A situation has a symmetry if certain changes make no difference. For instance: a mirror-symmetric image that you view in a mirror looks the same. A perfect ...
surface
Geometric space with two dimensions. Examples include the plane or the surface of a sphere.
supersymmetry
Abstract symmetrie that some of the models of particle physics satisfy: in such models, for every species of particles, there is a partner species with the ...
superstring theory
Synonym: supersymmetric string theory. String theory that satisfies the requirements of an abstract symmetry called superymmetry. All models of string theory ...
supernova
Highly energetic explosion that ends the life of stars with more than about ten solar masses. In this explosion, the outer layers of the stars are ejected into ...
supermassive black holes
are black holes with masses of more than a million solar masses. As far as we know, such holes can be found in the central regions of almost all galaxies. ...
supergravity
Class of modells that generalize Einstein's general theory of relativity in a way that satisfies the requirements of supersymmetry. Today, supergravity is of ...
sun
The central (and most massive) body of our solar system; the star closest to us; a ball of gas with a radius of 700000 km and a mass of 1.989·1030 kilograms. ...
strong force
One of the four fundamental forces in our universe (the others are electromagnetism, weak nuclear force and gravity). The strong force binds the quarks to form ...
straight line
In the plane, in three-dimensional everyday space or in more general flat spaces: Any line that forms the shortest connection between two given points. In the ...
stellar black holes
Stellar black holes are black holes with between a few and a dozen solar masses that are formed when the core of a massive star collapses. Basic information ...