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?
- Silencing vibrations in the ground and sounds...on April 6, 2021 at 4:07 pm
POSTECH professor Junsuk Rho's research team demonstrates artificial control of elastic waves and underwater sounds applicable as stealth technology.
- Quantum physicists measure the smallest...on March 10, 2021 at 5:26 pm
Researchers have succeeded in measuring the gravitational field of a gold sphere, just 2 mm in diameter, using a highly sensitive pendulum - and thus the smallest gravitational force. The experiment opens up new possibilities for testing the laws of gravity on previously unattained small scales.
- Quantum collaboration gives new gravity to the...on February 17, 2021 at 8:10 pm
Scientists have used cutting-edge research in quantum computation and quantum technology to pioneer a radical new approach to determining how our Universe works at its most fundamental level.
- Placing cosmological constraints on quantum...on February 10, 2021 at 6:33 pm
Researchers have used well-established cosmological observations to place tighter constraints on the quadratic model of the Generalized Uncertainty Principle, while discrediting the linear model.
- Could we harness energy from black holes?on January 13, 2021 at 3:08 pm
Physicists have found a new way to extract energy from black holes by breaking and rejoining magnetic field lines near the event horizon.
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.
- Hubble watches cosmic light bendon April 18, 2021 at 2:40 pm
This extraordinary image from the NASA/ESA Hubble Space Telescope of the galaxy cluster Abell 2813 (also known as ACO 2813) has an almost delicate beauty, which also illustrates the remarkable physics at work within it. The image spectacularly demonstrates the concept of gravitational lensing.
- Parker Solar Probe sees Venus orbital dust ring...on April 18, 2021 at 2:24 pm
NASA's Parker Solar Probe mission has given scientists the first complete look at Venus' orbital dust ring, a collection of microscopic dust particles that circulates around the Sun along Venus' orbit. Though earlier missions have made some observations of Venus' orbital dust ring, Parker Solar Probe's images are the first to show the planet's dust ring for nearly its entire 360-degree span around the Sun.
- Tarantula's ubiquity traced back to the cretaceouson April 16, 2021 at 9:01 pm
Tarantulas are among the most notorious spiders, due in part to their size, vibrant colors and prevalence throughout the world. But one thing most people don't know is that tarantulas are homebodies. Females and their young rarely leave their burrows and only mature males will wander to seek out a mate. How then did such a sedentary spider come to inhabit six out of seven continents?
- Corporations agree to transparency on climate...on April 16, 2021 at 4:44 pm
Insurer American International Group Inc., railroad company CSX Inc. and electric companies Duke Energy Corp., FirstEnergy Corp. and Entergy Corp. have pledged to report publicly about their influence on climate policy and alignment with the Paris Agreement, according to investors.
- Fast radio bursts shown to include lower...on April 16, 2021 at 3:11 pm
Since fast radio bursts (FRBs) were first discovered over a decade ago, scientists have puzzled over what could be generating these intense flashes of radio waves from outside of our galaxy. In a gradual process of elimination, the field of possible explanations has narrowed as new pieces of information are gathered about FRBs—how long they last, the frequencies of the radio waves detected, and so on.