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?
Deconstructing Schrödinger's cat
on February 14, 2020 at 6:47 pm
Many physicists have attempted to explain the problem of quantum superposition, as exemplified by Schrödinger's cat. Now a French theoretical physicist proposes a novel possible solution, which combines two different approaches and brings in universal gravitation.
Quantum paradox experiment may lead to more...
on October 15, 2019 at 1:22 pm
More accurate clocks and sensors may result from a recently proposed experiment, linking an Einstein-devised paradox to quantum mechanics. A physicist said the international collaboration aimed to test Einstein's twin paradox using quantum particles in a 'superposition' state.
Quantum vacuum: Less than zero energy
on October 2, 2019 at 2:27 pm
According to quantum physics, energy can be 'borrowed' -- at least for some time. Energies lower than zero are possible, much like a bank account that can be overdrawn. There are, however, certain restrictions to that. Scientists have now shown that these restrictions are very fundamental properties of our universe and must be true for various possible quantum theories.
Laser prototype for space-based gravitational...
on September 18, 2019 at 4:45 pm
Researchers have announced a prototype for a laser at the heart of the first space-based gravitational wave observatory, known as the Laser Interferometer Space Antenna (LISA) mission.
The magic wavelength of cadmium
on September 16, 2019 at 2:18 pm
Researchers experimentally determined a property of cadmium called the magic wavelength which is considered essential for the development of the most accurate clocks ever envisaged. The researchers hope this may permit simple and robust atomic clocks so accurate they could be used to improve our understanding of current theories and even test for new physics.
Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.
Scientists make most sensitive measurements to...
on February 26, 2020 at 8:42 pm
Silicon, the best-known semiconductor, is ubiquitous in electronic devices including cellphones, laptops and the electronics in cars. Now, researchers at the National Institute of Standards and Technology (NIST) have made the most sensitive measurements to date of how quickly electric charge moves in silicon, a gauge of its performance as a semiconductor. Using a novel method, they have discovered how silicon performs under circumstances beyond anything scientists could test […]
Bilingual mash ups: Counterintuitive findings...
on February 26, 2020 at 8:39 pm
A new study exposes the fallacy of relying on pronunciation as a measure of linguistic proficiency. The study, 'Revisiting phonetic integration in bilingual borrowing', by Shana Poplack, Suzanne Robillard, Nathalie Dion (all from the University of Ottawa), and John. C. Paolillo (University of Indiana Bloomington) will be published in March 2020 issue of the scholarly journal Language.
Complex local conditions keep fields of dunes...
on February 26, 2020 at 7:00 pm
Sand dunes, like many ecosystems, have more than one comfort zone. Variations in moisture, especially, can shift them from active, blowing waves of dry sand to rolling mounds with soils held down by grass and low shrubs.
Ancient meteorite site on Earth could reveal new...
on February 26, 2020 at 7:00 pm
Scientists have devised new analytical tools to break down the enigmatic history of Mars' atmosphere—and whether life was once possible there.
Researchers connect microbes in the twilight zone...
on February 26, 2020 at 6:22 pm
Seawater is more than just saltwater. The ocean is a veritable soup of chemicals.