These are organized by a classification scheme developed exclusively for Cosma. More…
relativity : a theory which is based on the two postulates (1) that the speed of light in a vacuum is constant and independent of the source or observer and (2) that the mathematical forms of the laws of physics are invariant in all inertial systems and which leads to the assertion of the equivalence of mass and energy and of change in mass, dimension, and time with increased velocity — called also special relativity, special theory of relativity — Webster
Relativity, generally refers to the theory of relativity usually encompasses two interrelated theories by Albert Einstein: special relativity and general relativity.
Special relativity applies to elementary particles and their interactions, describing all their physical phenomena except gravity.
General relativity explains the law of gravitation and its relation to other forces of nature. It applies to the cosmological and astrophysical realm, including astronomy.
The theory transformed theoretical physics and astronomy during the 20th century, superseding a 200-year-old theory of mechanics created primarily by Isaac Newton. It introduced concepts including spacetime as a unified entity of space and time, relativity of simultaneity, kinematic and gravitational time dilation, and length contraction.
In the field of physics, relativity improved the science of elementary particles and their fundamental interactions, along with ushering in the nuclear age. — Wikipedia
Einstein, Oppenheimer, Feynman: Physics in the 20th Century (MIT OCW Physics)
Introduction to Nuclear and Particle Physics (MIT OCW Physics)
Relativity (MIT OCW Physics)
OER Commons: Open Educational Resources
Albert Einstein News -- ScienceDaily Albert Einstein in the News. Research institutes have been testing Albert Einstein's theory of special relativity and general relativity. Was Albert Einstein right?
Researchers find quantum gravity has no symmetry
on June 19, 2019 at 2:31 pm
Using holography, researchers have found when gravity is combined with quantum mechanics, symmetry is not possible. […]
Development of a displacement sensor to measure...
on May 17, 2019 at 3:51 pm
One of the most unknown phenomena in modern physics is gravity. Its measurement and laws remain somewhat of an enigma. Researchers have revealed important information about a new aspect of the nature of gravity by probing the smallest mass-scale. […]
Testing the symmetry of space-time by means of...
on March 13, 2019 at 6:33 pm
According to Einstein the speed of light is always the same. But according to theoretical models of quantum gravitation, this uniformity of space-time does not apply to particles. Physicists have now tried to detect a change in the uniformity of space-time using two optical Ytterbium clocks. […]
New way to sense earthquakes could help improve...
on March 11, 2019 at 12:19 pm
Every year earthquakes worldwide claim hundreds or even thousands of lives. Forewarning allows people to head for safety and a matter of seconds could spell the difference between life and death. Researchers demonstrate a new earthquake detection method -- their technique exploits subtle telltale gravitational signals traveling ahead of the tremors. Future research could boost early warning systems. […]
Listening to quantum radio
on March 8, 2019 at 3:21 pm
Researchers have created a quantum circuit that enables them to listen to the weakest radio signal allowed by quantum mechanics. This new quantum circuit opens the door to possible future applications in areas such as radio astronomy and medicine (MRI). It also enables researchers to do experiments that can shed light on the interplay between quantum mechanics and gravity. […]
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Researchers confirm that narwhals and belugas can...
on June 20, 2019 at 3:00 pm
A team of University of Copenhagen researchers has compiled the first and only evidence that narwhals and beluga whales can breed successfully. DNA and stable isotope analysis of an anomalous skull from the Natural History Museum of Denmark has allowed researchers to confirm the existence of a narwhal-beluga hybrid. […]
'DNA microscopy' offers entirely new way to image...
on June 20, 2019 at 3:00 pm
Microscopy just got reinvented—again. […]
Scientists reveal the inter-cluster and...
on June 20, 2019 at 2:57 pm
From effective medicines to molecular sensors to fuel cells, metal clusters are becoming fundamentally useful in the health, environment, and energy sectors. This diverse functionality of clusters arises from the variability in size and type. Now, scientists led by Professor Yuichi Negishi, of the Department of Applied Chemistry at Tokyo University of Science, add to this ongoing tale by explaining the dynamics of the metal cluster thiolate-protected gold-silver alloy in solution. This helps in […]
Einstein's relativity document gifted to Nobel...
on June 20, 2019 at 1:19 pm
The Nobel Museum in Stockholm has been gifted Albert Einstein's first paper published after he received the Nobel Prize in 1922 and discussing his then still controversial relativity theory. […]
Massive brown dwarf detected by astronomers
on June 20, 2019 at 1:00 pm
An international team of astronomers has found a new brown dwarf, one of the most massive objects of this type discovered to date. The newly detected brown dwarf, designated EPIC 212036875 b, turns out to be about 50 times more massive than Jupiter. The finding is detailed in a paper published June 13 on arXiv.org. […]