Tons of awesome chameleon wallpapers to download for free. You can also upload and share your favorite chameleon wallpapers. HD wallpapers and background images. Carpet Chameleon (Fucifer lateralis) SCIENTIFIC NAME: Furcifer lateralis DESCRIPTION: We have a handful of beautiful carpet chameleons for sale. These are one of the most colorful of all chameleon species. Both males and females are colorful, but unlike many other chameleon. The leaf chameleon grows to just 0.5 inches (16 millimeters) and can sit comfortably on the head of a match. Unlike other animals, chameleons continue to grow throughout their lives. The chameleonâs specialized vision and a specialized tongue-projection system permit the capture of insects and even birds from a distance.The chameleonâs eyes are very good at detecting and regulating light. The lens of a chameleonâs eye is capable of focusing extremely rapidly, and it can enlarge visual images much like a telephoto lens. Although many other.
The chameleon is a hypothetical scalar particle that couples to matter more weakly than gravity,[1] postulated as a dark energy candidate.[2] Due to a non-linear self-interaction, it has a variable effective mass which is an increasing function of the ambient energy densityâas a result, the range of the force mediated by the particle is predicted to be very small in regions of high density (for example on Earth, where it is less than 1mm) but much larger in low-density intergalactic regions: out in the cosmos chameleon models permit a range of up to several thousand parsecs. As a result of this variable mass, the hypothetical fifth force mediated by the chameleon is able to evade current constraints on equivalence principle violation derived from terrestrial experiments even if it couples to matter with a strength equal or greater than that of gravity. Although this property would allow the chameleon to drive the currently observed acceleration of the universe's expansion, it also makes it very difficult to test for experimentally.
Hypothetical properties[edit]
Chameleon particles were proposed in 2003 by Khoury and Weltman.
In most theories, chameleons have a mass that scales as some power of the local energy density: meffâ¼Ïα{displaystyle m_{text{eff}}sim rho ^{alpha }}, where αâ1{displaystyle alpha simeq 1}.
Chameleons also couple to photons, allowing photons and chameleons to oscillate between each other in the presence of an external magnetic field.[3]
Chameleons can be confined in hollow containers because their mass increases rapidly as they penetrate the container wall, causing them to reflect. One strategy to search experimentally for chameleons is to direct photons into a cavity, confining the chameleons produced, and then to switch off the light source. Chameleons would be indicated by the presence of an afterglow as they decay back into photons.[4]
Experimental searches[edit]
A number of experiments have attempted to detect chameleons along with axions.[5]
The GammeV experiment[6] is a search for axions, but has been used to look for chameleons too. It consists of a cylindrical chamber inserted in a 5 T magnetic field. The ends of the chamber are glass windows, allowing light from a laser to enter and afterglow to exit. GammeV set the limited coupling to photons in 2009.[7]
CHASE (CHameleon Afterglow SEarch) results published in November 2010,[8] improve the limits on mass by 2 orders of magnitude and 5 orders for photon coupling.
A 2014 neutron mirror measurement excluded chameleon field for values of the coupling constant β>5.8Ã108{displaystyle beta >5.8times 10^{8}},[9] where the effective potential of the chameleon quanta is written as Veff=V(Φ)+eβΦ/MPâ²Ï{displaystyle V_{text{eff}}=V(Phi )+e^{beta Phi /M'_{text{P}}}rho }, Ï{displaystyle rho } being the mass density of the environment, V(Φ){displaystyle V(Phi )} the chameleon potential and MPâ²{displaystyle M'_{text{P}}} the reduced Planck mass.
The CERN Axion Solar Telescope has been suggested as a tool for detecting chameleons.[10]
References[edit]Notes[edit]
Chameleon 0 95 Fm RadioJournal entries[edit]
External links[edit]Chameleon 0 95 FmChameleon 0 95 Fm Radio
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Chameleon_particle&oldid=939756904'
Comments are closed.
|
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |