photon sphere

collocation in English

meaningsofphotonandsphere

These words are often used together. Click on the links below to explore the meanings. Or,see other collocations withsphereorphoton.
photon
noun[C]
uk
/ˈfəʊ.tɒn/us
/ˈfoʊ.tɑːn/
a single unit ...
See more atphoton
sphere
noun[C]
uk
/sfɪər/us
/sfɪr/
an object shaped like a ...
See more atsphere

(Definition ofphotonandspherefrom theCambridge English Dictionary© Cambridge University Press)

Examplesofphoton sphere

These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.
The concept of aphotonspherein a static spherically metric was generalized to a photon surface of any metric.
From
Wikipedia
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Thephotonsphereis located farther from the center of a black hole than the event horizon and ergosphere.
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Another property of thephotonsphereis centrifugal force (nb: not centripetal) reversal.
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There are no stable free fall orbits that exist within or cross thephotonsphere.
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Conversely, subject to an energy condition, anyphotonspheremust cover more than a certain amount of matter, a black hole, or a naked singularity.
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Subject to an energy condition, a black hole in any spherically symmetric spacetime must be surrounded by aphotonsphere.
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Outside thephotonsphere, the faster one orbits the greater the outward force one feels.
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Inside thephotonspherethe faster you orbit the greater your felt weight or inward force.
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If approaching at a different angle, such as one from the poles of the black hole to the equator, there is only onephotonsphere.
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Similar properties ofphotonspherewere also found numerically for the metamaterial black hole.
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Thephotonspherethat is closer to the black hole is moving in the same direction as the rotation, whereas the photon sphere further away is moving against it.
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A rotating black hole has two photon spheres.
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This equation entails that photon spheres can only exist in the space surrounding an extremely compact object (a black hole or possibly a neutron star).
From
Wikipedia
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These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.
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