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Particle production in a gravitational wave background | | Preston Jones
; Patrick McDougall
; Douglas Singleton
; | | Date: |
7 Oct 2016 | | Abstract: | We study the possibility that massless particles, such as photons, are
produced by a gravitational wave. That such a process should occur is implied
by tree-level, Feynman diagrams such as two gravitons turning into two photons
{it i.e.} $g + g
ightarrow gamma + gamma$. Here we calculate the rate at
which a gravitational wave creates a massless, scalar field. This is done by
placing the scalar field in the background of a plane gravitational wave and
calculating the 4-current of the scalar field. Even in the vacuum limit of the
scalar field it has a non-zero vacuum expectation value (similar to what occurs
in the Higgs mechanism) and a non-zero current. We associate this with the
production of scalar field quanta by the gravitational field. This effect has
potential consequences for the attenuation of gravitational waves since the
massless particles are being produced at the expense of the gravitational
field. This is related to the (time-dependent) Schwinger effect but with the
electric field replaced by the the gravitational wave background and the
electrons/positrons replaced by massless scalar "photons". Since the produced
scalar quanta are massless there is no exponential suppression as occurs in the
Schwinger effect due to the electron mass. | | Source: | arXiv, 1610.2973 | | Services: | Forum | Review | PDF | Favorites | |
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