From Wikipedia, the free encyclopedia
A black hole is a region of spacetime from which nothing, not even light, can escape.[1]
The theory of general relativity predicts that a sufficiently compact mass will deform
spacetime to form a black hole. Around a black hole there is a mathematically defined
surface called an event horizon that marks the point of no return. It is called "black"
because it absorbs all the light that hits the horizon, reflecting nothing, just like a
perfect black body in thermodynamics.[2] Quantum mechanics predicts that black holes emit
radiation like a black body with a finite temperature. This temperature is inversely
proportional to the mass of the black hole, making it difficult to observe this radiation
for black holes of stellar mass or greater.
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From Wikipedia, the free encyclopedia
Schrödinger's cat is a thought experiment, sometimes described as a paradox, devised by Austrian
physicist Erwin Schrödinger in 1935. It illustrates what he saw as the problem of the Copenhagen
interpretation of quantum mechanics applied to everyday objects. The scenario presents a cat that
might be alive or dead, depending on an earlier random event. Although the original "experiment"
was imaginary, similar principles have been researched and used in practical applications.
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From Wikipedia, the free encyclopedia
Quantum gravity (QG) is the field of theoretical physics which attempts to develop scientific
models that unify quantum mechanics (describing three of the four known fundamental interactions)
with general relativity (describing the fourth, gravity). It is hoped that development of
such a theory would unify into a single consistent model all fundamental interactions and to
describe all known observable interactions in the universe, at both subatomic and cosmological
scales.
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