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?
String theory: Is dark energy even allowed?
on October 9, 2018 at 2:24 pm
In string theory, a paradigm shift could be imminent. In June, a team of string theorists published a conjecture which sounded revolutionary: String theory is said to be fundamentally incompatible with our current understanding of 'dark energy'. A new study has now found out that this conjecture seems to be incompatible with the existence of the Higgs particle. […]
Searching for errors in the quantum world
on September 18, 2018 at 3:44 pm
The theory of quantum mechanics is well supported by experiments. Now, however, a thought experiment by physicists yields unexpected contradictions. These findings raise some fundamental questions -- and they're polarising experts. […]
Quantum leap for Einstein's equivalence principle
on August 21, 2018 at 1:42 pm
How Einstein's equivalence principle extends to the quantum world has been puzzling physicists for decades, but a research team has now found the key to this question. […]
Household phenomenon observed by Leonardo da...
on August 7, 2018 at 3:03 pm
Since the 1820s scientists have believed that hydraulic jumps occur partly as a result of the gravitational pull. But a new article has disproved this longstanding theory. […]
Centenary of cosmological constant lambda
on July 11, 2018 at 2:57 pm
Physicists are now celebrating the 100th anniversary of the cosmological constant. On this occasion, two recent articles highlight its role in modern physics and cosmology. Before becoming widely accepted, the cosmological constant had to undergo many discussions about its necessity, its value and its physical essence. Today, there are still unresolved problems in understanding the deep physical nature of the phenomena associated with the cosmological constant. […]
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Gravitational waves could soon provide measure of...
on October 22, 2018 at 9:16 pm
Twenty years ago, scientists were shocked to realize that our universe is not only expanding, but that it's expanding fasterover time. […]
Mystery of how black widow spiders create...
on October 22, 2018 at 7:00 pm
Researchers at Northwestern University and San Diego State University (SDSU) have better unraveled the complex process of how black widow spiders transform proteins into steel-strength fibers. This knowledge promises to aid scientists in creating equally strong synthetic materials. […]
Research finds NJ numerical nutrient criterion...
on October 22, 2018 at 4:49 pm
A new way of measuring the relative habitability of freshwater environments for fish and aquatic insects suggests that New Jersey's water monitoring and treatment standards could use a boost. […]
Cellular trash cans reveal the roles of proteins...
on October 22, 2018 at 3:25 pm
If we really want to know how our body's cells work—or don't work, in the case of disease—we might need to look beyond their genes and even beyond the proteins they are made of. We may need to start going through the cellular "trash." The group of Dr. Yifat Merbl of the Weizmann Institute of Science developed a system to do just that, finding that "cellular dumpster-diving" contains information about the cell's function that is not otherwise seen. The group applied their new […]
Asian elephants could be the maths kings of the...
on October 22, 2018 at 3:22 pm
Asian elephants demonstrate numeric ability which is closer to that observed in humans rather than in other animals. This is according to lead author Naoko Irie of SOKENDAI (The Graduate University for Advanced Studies and the Japan Society for the Promotion of Science) in Japan. In a study published in the Springer-branded Journal of Ethology, Irie and her colleagues found that an Asian elephants' sense of numbers is not affected by distance, magnitude or ratios of presented numerosities, and […]