dilaton


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dilaton

[′dī·lə‚tän]
(particle physics)
A hypothetical elementary particle having zero mass and zero spin, which is introduced in constructing a scale invariant theory involving massive particles.
References in periodicals archive ?
dilaton gel for expansion of channels or analogue of 20 pcs.
Scientists from the BlackHoleCam team in Europe, who are part of the EHTC, have now gone a step further and investigated whether it is possible to distinguish between a "Kerr" black hole from Einstein's gravity and a "dilaton" black hole, which is a possible solution of an alternative theory of gravity.
In the low energy effective action, usually string theory based-models are comprised of two massless scalar fields, the dilaton, and the axion (see, e.g., [1]).
Indeed, it has been shown previously that the higher-dimensional VSI space-time with fluxes and dilaton is solutions of type IIB supergravity [11-13].
with [T.sub.1] the D1-brane tension, G the bulk metric, (for simplicity we set the Kalb-Ramond two form B to be zero), [phi] the dilaton and F the field strength, a; b = [tau],[sigma] and i, j = 1, 2, 3, 4, 5.
Berman, "Energy and angular momentum of dilaton black holes," Revista Mexicana de Astronomia y Astrofisica, vol.
"We have determined that when the Higgs condensate disappeared to make way for the particles that exist today, the equations permitted the existence of a new, massless particle, the dilaton," explained EPFL physicist Daniel Zenhausern.
A little more work (use the string and dilaton equations in [10]) on the numbers <[[tau].sup.u.sub.2][[tau].sup.v.sub.0]> can show that the constant [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] is actually [lambda]-free, as we already know in genus 0 and 1 thanks to Corollary 4, hence the following.
Petropoulos, Ricci flows and expansion in axion dilaton cosmology, arXiv:hep-th/0610281.
La razon de que prevalezca la idea de la existencia de campos escalares fundamentales en la naturaleza corresponde a la necesidad teorica que requieren algunas teorias generales, tales como el Modelo Estandar de particulas elementales (Kane, 1993), que postula el boson de Higgs para explicar el mecanismo mediante el cual las particulas adquieren masa, y la teoria de cuerdas (Polchinski, 1998), que postula como un ejemplo el Dilaton como componente de la materia oscura.
Los primeros estados excitados son estados masicos de la forma [X.sup.[micron].sub.+]([sigma])[X.sup.v.sub.+]([sigma])|0> que son la parte simetrica, la traza y la parte antisimetrica de un tensor formado por las X que son identificados con el campo gravitacional, el dilaton y un tensor de campo antisimetrico respectivamente [8].
Pero, dejando al margen su desafortunada entrada en escena, en la actualidad se la concibe como un parametro que expresa la densidad de energia del vacio, y que debe resultar de la suma de las contribuciones de diversos campos energeticos (el campo electromagnetico, los campos de Higgs asociados con la fuerza debil, el campo inflaton postulado por la cosmologia inflacionaria, el campo dilaton postulado por la teoria de supercuerdas etc.