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Gravitational Interaction Of Antimatter
The gravitational interaction of antimatter with matter or antimatter has been observed by physicists. As was the consensus among physicists previously, it was experimentally confirmed that gravity attracts both matter and antimatter at the same rate within experimental error. Antimatter's rarity and tendency to annihilate when brought into contact with matter makes its study a technically demanding task. Furthermore, gravity is much weaker than the other fundamental forces, for reasons still of interest to physicists, complicating efforts to study gravity in systems small enough to be feasibly created in lab, including antimatter systems. Most methods for the creation of antimatter (specifically antihydrogen) result in particles and atoms of high kinetic energy, which are unsuitable for gravity-related study. Antimatter is gravitationally attracted to matter. The magnitude of the gravitational force is also the same. This is predicted by theoretical arguments like the grav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Matter
In classical physics and general chemistry, matter is any substance that has mass and takes up space by having volume. All everyday objects that can be touched are ultimately composed of atoms, which are made up of interacting subatomic particles. In everyday as well as scientific usage, ''matter'' generally includes atoms and anything made up of them, and any particles (or combination of particles) that act as if they have both rest mass and volume. However it does not include massless particles such as photons, or other energy phenomena or waves such as light or heat. Matter exists in various states (also known as phases). These include classical everyday phases such as solid, liquid, and gas – for example water exists as ice, liquid water, and gaseous steam – but other states are possible, including plasma, Bose–Einstein condensates, fermionic condensates, and quark–gluon plasma. Usually atoms can be imagined as a nucleus of protons and neu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gravitational Lensing
A gravitational lens is matter, such as a galaxy cluster, cluster of galaxies or a point particle, that bends light from a distant source as it travels toward an observer. The amount of gravitational lensing is described by Albert Einstein's General relativity, general theory of relativity. If light is treated as Corpuscular theory of light, corpuscles travelling at the speed of light, Newtonian physics also predicts the bending of light, but only half of that predicted by general relativity. Orest Khvolson (1924) and Frantisek Link (1936) are generally credited with being the first to discuss the effect in print, but it is more commonly associated with Einstein, who made unpublished calculations on it in 1912 and published an article on the subject in 1936. In 1937, Fritz Zwicky posited that galaxy clusters could act as gravitational lenses, a claim confirmed in 1979 by observation of the Twin QSO SBS 0957+561. Description Unlike an lens (optics), optical lens, a point-li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Massimo Villata
Massimo () is a masculine Italian given name. Notable people with the name include: * Massimo Agostinelli (Max Agos) (born 1987), Swiss-based Italian American artist, entrepreneur and activist * Massimo Agostini (born 1964), Italian football manager and former striker * Massimo Alioto (born 1972), associate professor of Electrical and Computer Engineering at the National University of Singapore * Massimo Allevi (born 1969), former Italian pole vaulter * Massimo Ambrosini Cavaliere OMRI (born 1977), Italian former professional footballer * Massimo De Ambrosis (born 1964), Italian actor and voice actor * Massimo Amfiteatrof (1907–1990), Russian-born Italian cellist * Paolo Massimo Antici (1924–2003), Italian diplomat, founder of the Antici Group * Massimo Aparo (born 1953), Italian nuclear engineer * Massimo Apollonio (born 1970), former Italian racing cyclist * Massimo Ardinghi (born 1971), former professional tennis player from Italy * Massimo Arduini (born 1960), Itali ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ruggero Santilli
Ruggero Maria Santilli (born September 8, 1935) is an Italo-American nuclear physicist. Mainstream scientists dismiss his theories as fringe science. Biography Ruggero Maria Santilli was born September 8, 1935) in Capracotta. He studied physics at the University of Naples and earned his PhD in physics from the University of Turin, graduating in 1965. He held various academic positions in Italy until 1967, when he took a position at University of Miami; a year later he moved to Boston University, and subsequently held visiting scientist positions at Massachusetts Institute of Technology and Harvard University. In September 1981, Santilli established a one-man organization, the Institute for Basic Research in Boston; he told a reporter from '' St. Petersburg Times'' in 2007 that he left Harvard because scientists there viewed his work as "heresy". In 1982 Austrian-British philosopher Karl Popper wrote that Santilli's calls for tests on the validity of quantum mechanics within nuc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dirac Hole Theory
Dirac hole theory is a theory in quantum mechanics, named after English theoretical physicist Paul Dirac, who introduced it in 1929. The theory poses that the continuum of negative energy states, that are solutions to the Dirac equation, are filled with electrons, and the vacancies in this continuum (holes) are manifested as positrons with energy and momentum that are the negative of those of the state. The discovery of the positron in 1929 gave a considerable support to the Dirac hole theory. While Enrico Fermi, Niels Bohr and Wolfgang Pauli were skeptical about the theory, other physicists, like Guido Beck and Kurt Sitte, made use of Dirac hole theory in alternative theories of beta decay. Gian Wick extended Dirac hole theory to cover neutrinos, introducing the anti-neutrino as a hole in a neutrino Dirac sea. Pair production and annihilation Hole theory provides an alternative perspective on the processes of pair production and annihilation – when a photon A phot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gerard 't Hooft
Gerardus "Gerard" 't Hooft (; born July 5, 1946) is a Dutch theoretical physicist and professor at Utrecht University, the Netherlands. He shared the 1999 Nobel Prize in Physics with his thesis advisor Martinus J. G. Veltman "for elucidating the quantum structure of electroweak interactions". His work concentrates on gauge theory, black holes, quantum gravity and fundamental aspects of quantum mechanics. His contributions to physics include: a proof that gauge theories are renormalizable; dimensional regularization; and the holographic principle. Biography Early life 't Hooft was born in Den Helder on July 5, 1946, to Hendrik 't Hooft and Margaretha Agnes 'Peggy' van Kampen, but grew up in The Hague. He was the middle child of a family of three. He comes from a family of scholars. His great uncle was Nobel prize laureate Frits Zernike; his maternal grandfather was Pieter Nicolaas van Kampen, a professor of zoology at Leiden University; his uncle Nico van Kampen wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gabriel Chardin
In the Abrahamic religions (Judaism, Christianity, Islam), Gabriel ( ) is an archangel with the power to announce God's will to mankind, as the messenger of God. He is mentioned in the Hebrew Bible, the New Testament and the Quran. Many Christian traditions – including Eastern Orthodoxy, Catholicism, Lutheranism, and Anglicanism – revere Gabriel as a saint. In the Hebrew Bible, Gabriel appears to the prophet Daniel to explain his visions ( Daniel 8:15–26, 9:21–27). The archangel also appears in the Book of Enoch and other ancient Jewish writings not preserved in Hebrew. Alongside the archangel Michael, Gabriel is described as the guardian angel of the people of Israel, defending it against the angels of the other peoples. In the New Testament, the Gospel of Luke relates the Annunciation, in which the angel Gabriel appears to Zechariah foretelling the birth of John the Baptist with the angel Gabriel foretelling the Virgin Mary the birth of Jesus Christ, res ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
