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Their existence was indirectly confirmed when observations of the binary pulsar PSR 1913+16 in 1974 showed an orbital decay which matched Einstein's predictions of energy loss by gravitational radiation. The Nobel Prize in Physics 1993 was awarded to Hulse and Taylor for this discovery. [60] Direct detection of gravitational waves had long been ...
Gravitational waves transport energy as gravitational radiation, a form of radiant energy similar to electromagnetic radiation. [7] Newton's law of universal gravitation , part of classical mechanics , does not provide for their existence, instead asserting that gravity has instantaneous effect everywhere.
Direct applications of the radiation pressure force in these fields are, for example, laser cooling (the subject of the 1997 Nobel Prize in Physics), [5] quantum control of macroscopic objects and atoms (2012 Nobel Prize in Physics), [6] interferometry (2017 Nobel Prize in Physics) [7] and optical tweezers (2018 Nobel Prize in Physics). [8]
Light pollution is the presence of any unwanted, inappropriate, or excessive artificial lighting. [1] [2] In a descriptive sense, the term light pollution refers to the effects of any poorly implemented lighting sources, during the day or night. Light pollution can be understood not only as a phenomenon resulting from a specific source or kind ...
Supernova explosions—the gravitational collapse of massive stars at the end of their lives—emit gravitational radiation that may be seen by current interferometers. [23] A multi-messenger detection (electromagnetic and gravitational radiation, and neutrinos ) would help to better understand the supernova process and the formation of black ...
A typical microlensing light curve is shown below: Typical light curve of gravitational microlensing event (OGLE-2005-BLG-006) with its model fitted (red) A typical microlensing event like this one has a very simple shape, and only one physical parameter can be extracted: the time scale, which is related to the lens mass, distance, and velocity.
The gravitational field of a beam of light is modelled, in general relativity, by a certain axi-symmetric pp-wave. An example of pp-wave given when gravity is in presence of matter is the gravitational field surrounding a neutral Weyl fermion: the system consists in a gravitational field that is a pp-wave, no electrodynamic radiation, and a ...
[5] [8] A gravitational redshift can also equivalently be interpreted as gravitational time dilation at the source of the radiation: [8] [2] if two oscillators (attached to transmitters producing electromagnetic radiation) are operating at different gravitational potentials, the oscillator at the higher gravitational potential (farther from the ...