Search Results - Chameleon particle
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Chameleons in the early universe: kicks, rebounds, and particle production
Published 2014“…Whenever a particle species becomes nonrelativistic, however, the trace of the stress-energy tensor is temporarily nonzero, and the chameleon begins to roll. …”
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The shape dependence of chameleon screening
Published 2018“…We find that deviations from spherical symmetry can increase the chameleon acceleration experienced by a test particle, and that the least screened objects are those which minimize some internal dimension. …”
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The Shape Dependence of Chameleon Gravity
Published 2023“…The chameleon model is a modified gravity theory that introduces an additional scalar field that couples to matter through a conformal coupling. …”
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Using atom interferometry to detect dark energy
Published 2015“…The way the field behaves in the presence of a spherical source is determined and we then go on to show how in the presence of the kind of high vacuum associated with atom interferometry experiments, and when the test particle is an atom, it is possible to use the associated interference pattern to place constraints on the acceleration due to the fifth force of the chameleon field - this has already been used to rule out large regions of the chameleon parameter space and maybe one day will be able to detect the force due to the dark energy field in the laboratory.…”
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Screening of scalar fields in Dirac-Born-Infeld theory
Published 2014“…Unlike generic P(X) or chameleon theories, screening happens within the regime of validity of the effective field theory thanks to the DBI symmetry. …”
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Astro- and Quantum Physical Tests of Screened Scalar Fields
Published 2019“…Secondly, it will be shown how fluctuations of a chameleon scalar field induce the open dynamics of a quantum test particle. …”
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Explaining the proton radius puzzle with disformal scalars
Published 2015“…Short distance properties of the Galileon where nonperturbative effects in vacuum are present ensure that unitarity is preserved in high-energy particle collisions. In matter, the chameleon mechanism alleviates the constraints on disformal interactions coming from the burning rates for stellar objects. …”
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Examining Non-Linearities with Screened Fifth Forces
Published 2021“…It will be shown that non-linearities are important for screened scalar fields undergoing a superradiant instability, but that previous studies on axion-like particles are not entirely relevant for symmetrons and chameleons; namely, no `bosenova' is expected to occur for these models. …”
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Is the universe transparent?
Published 2015“…Cosmic opacity may be caused by absorption or scattering due to matter in the Universe, or by extragalactic magnetic fields that can turn photons into unobserved particles (e.g., light axions, chameleons, gravitons, Kaluza-Klein modes), and it is crucial to correctly interpret astronomical photometric measurements like type Ia supernovae observations. …”
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