NationMaster - Encyclopedia: Gravitino

The gravitino is the hypothetical supersymmetric partner of the graviton, as predicted by theories combining general relativity and supersymmetry, i.e. supergravity theories. If it exists it is a fermion of spin 3/2, therefore obeys Rarita-Schwinger equation. This article is in need of attention from an expert on the subject. ... In physics, the graviton is a hypothetical elementary particle that transmits the force of gravity in most quantum gravity systems. ... General relativity (GR) is the geometrical theory of gravitation published by Albert Einstein in 1915. ... This article is in need of attention from an expert on the subject. ... In theoretical physics, a supergravity theory is a field theory combining supersymmetry and general relativity. ... In particle physics, fermions, (named after Enrico Fermi), are particles with semi-integer spin. ... In physics, spin refers to the angular momentum intrinsic to a body, as opposed to orbital angular momentum, which is generated by the motion of its center of mass about an external point. ... In theoretical physics, the Rarita-Schwinger equation is the field equation of spin-3/2 fermions. ...

Light Gravitino

If the gravitino is the lightest supersymmetric particle and R-parity is conserved (or nearly so), many or all supersymmetric particles can decay into their superpartner and a gravitino which yields the following effects: This article is in need of attention from an expert on the subject. ... R-parity is a concept in particle physics. ...

1) The gravitino could make up most of the dark matter in the universe. In cosmology, dark matter refers to hypothetical matter particles, of unknown composition, that do not emit or reflect enough electromagnetic radiation to be detected directly, but whose presence can be inferred from gravitational effects on visible matter such as stars and galaxies. ...

2) The decays might be detected at future particle accelerators. This can be done if either a neutral supersymmetric particle decays within the detector (only for very short lifetimes) or if a charged supersymmetric particle is stopped outside the detector (possible for longer lifetimes, too).

The other leading candidate for the lightest supersymmetric particle is the neutralino. In particle physics, the neutralino is a hypothetical particle and part of the doubling of the menagerie of particles predicted by supersymmetric theories. ...

Categories: Fermions | Quantum gravity | Particle physics stubs In particle physics, fermions, (named after Enrico Fermi), are particles with semi-integer spin. ... Quarks are one of the two basic constituents of matter in the Standard Model of particle physics. ... In physics, a particle is a lepton if it has a spin of 1/2 and does not experience the strong nuclear force. ... Quarks are one of the two basic constituents of matter in the Standard Model of particle physics. ... The up quark is a first-generation quark with a charge of +(2/3)e. ... For other uses of this term, see: Quark (disambiguation) 1974 discovery photograph of a possible charmed baryon, now identified as the Σc++ In particle physics, the quarks are subatomic particles thought to be elemental and indivisible. ... For other uses of this term, see: Quark (disambiguation) 1974 discovery photograph of a possible charmed baryon, now identified as the Σc++ In particle physics, the quarks are subatomic particles thought to be elemental and indivisible. ... For other uses of this term, see: Quark (disambiguation) 1974 discovery photograph of a possible charmed baryon In particle physics, the quarks are subatomic particles thought to be elemental and indivisible. ... The bottom quark is a third-generation quark with a charge of -(1/3)e. ... The top quark is a third-generation quark with a charge of +(2/3)e. ... In physics, a particle is a lepton if it has a spin of 1/2 and does not experience the strong nuclear force. ... Properties The electron is a fundamental subatomic particle that carries a negative electric charge. ... The moons shadow, as seen in muons 700m below ground at the Soudan 2 detector. ... The tau lepton (often called the tau or occasionally the tauon) is a negatively charged elementary particle with a lifetime of 3Ã—10âˆ’13 seconds and a high mass of 1777 MeV (compared to 939 MeV for protons and 0. ... The neutrino is an elementary particle. ... Gauge bosons are bosonic particles which act as carriers of the fundamental forces of Nature. ... In physics, the photon (from Greek Ï†Ï‰Ï‚, phÅs, meaning light) is the quantum of the electromagnetic field; for instance, light. ... In physics, the W and Z bosons are the elementary particles that mediate the weak nuclear force. ... In particle physics, gluons are vector gauge bosons that mediate strong color charge interactions of quarks in quantum chromodynamics (QCD). ... The Higgs boson is a hypothetical massive scalar elementary particle predicted to exist by the Standard Model of particle physics. ... In physics, the graviton is a hypothetical elementary particle that transmits the force of gravity in most quantum gravity systems. ... This is a list of particles in particle physics, including currently known and hypothetical elementary particles, as well as the composite particles that can be built up from them. ...