n
(astrophysics) The opposite of an event horizon, allowing escape but not entry.
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(attributive) A divergence-free, curl-only polarization signal in the cosmic microwave background radiation.
n
(physics) a theoretical body, approximated by a hole in a hollow black sphere, that absorbs all incident electromagnetic radiation and reflects none; it has a characteristic emission spectrum
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(cosmology) Any of several proposed submanifolds of a black brane.
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(physics) A change in the wavelength of light, in which the wavelength is shorter than when it was emitted at the source.
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(physics) The hypothesis that Einstein's general relativity theory singularities are always hidden from the remote observer, and are only visible as black holes.
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(astrophysics) A possible non-random component of the peculiar velocity of galaxy clusters.
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(astrophysics, cosmology, astronomy, physics) The unknown portion of the Universe outside standard physics, including dark matter and dark energy.
n
(astrophysics) A two-dimensional singularity hypothesized in string theory.
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(physics) A type of wormhole that is inherently unstable and collapses before any information or matter can pass through.
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A proposed alternative to a black hole whose collapse continually slows down, and that does not form an event horizon
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(physics) A hypothetical phenomenon where an observer falling into a black hole encounters high-energy quanta at or near the event horizon.
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(sciences, astronomy, physics) In one theory, the ultimate fate of the universe, consisting of a Big Bang in reverse.
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Ellipsis of cosmic gravitational-wave background. [The stochastic background of gravitational waves produced during the creation of the universe.]
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Alternative form of gravity darkening [(physics, astronomy) The phenomenon of a star rotating so rapidly that it is oblate, with a larger radius and thus lower surface gravity at the equator (which is thus cooler and darker: gravity-darkened), and higher surface gravity at the poles (which are hotter and brighter: gravity brightened).]
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(physics) The black hole information paradox.
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(physics) A weak line in an X-ray spectrum close to a normal line
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(cosmology) An extremely rapid expansion of the universe, theorized to have occurred very shortly after the Big Bang.
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(astronomy) a relationship that specifies the mass distribution of a newly formed stellar population
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An uncharged (q = 0), rotating (L ≠ 0) black hole.
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A charged (q ≠ 0), rotating (L ≠ 0) black hole.
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(astrophysics, cosmology, astronomy, physics) The known universe; the part of the universe that is not part of the dark sector; the segment of the universe that is explained by the known laws of physics, and whose components (particles) are predicted by it. The portion of the universe that is not dark matter nor dark energy.
n
Alternative form of massive compact halo object [(astronomy, physics) Any kind of astronomical body comprising normal baryonic matter that in sufficient numbers might explain the apparent presence of dark matter in galaxy halos.]
n
(astronomy, physics) Alternative form of massive compact halo object [(astronomy, physics) Any kind of astronomical body comprising normal baryonic matter that in sufficient numbers might explain the apparent presence of dark matter in galaxy halos.]
n
(astronomy, physics) Any kind of astronomical body comprising normal baryonic matter that in sufficient numbers might explain the apparent presence of dark matter in galaxy halos.
n
(astronomy) The abundance of elements heavier than helium in stars as a result of nucleosynthesis.
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(astrophysics) An as yet theoretical gravitational singularity with no event horizon, making it observable, unlike a black hole whose event horizon prevents light from reaching an observer situated outside the event horizon.
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A thought experiment that exhibits a nondeterministic system within the bounds of Newtonian mechanics. It involves an idealized particle initially sitting motionless at the apex of an idealized radially symmetrical frictionless dome of a certain form. The particle may, after an arbitrary period of time, slide down the dome in an arbitrary direction, contrary to intuition.
n
(astronomy, metrology) Short for parallax second. [A unit of length, used in astronomy, defined as the distance from the Earth of an object that exhibits a parallax of 1 arcsecond. It is approximately equal to 3.08568025 × 10¹³ kilometers or 3.2616 light years.]
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(astronomy) A unit of solid angle equal to 10⁻¹² radians
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(physics) An angular frequency of one radian per Planck time.
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(astrophysics) A hypothetical astronomical object whose energy is around the Planck density (5.155 × 10⁹⁶ kg/m³).
adj
(physics) Describing a form of black hole that has a quasihorizon.
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A charged (q ≠ 0), nonrotating (L = 0) black hole.
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An uncharged (q = 0), nonrotating (L = 0) black hole.
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(astronomy) The radius of an object such that, if all its mass were compressed within that radius, the escape velocity would equal the speed of light.
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(astronomy) A high-energy particle coming from the Sun.
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(cosmology) A proposed inflation of spacetime in the early universe driven by the kinetic energy of the dilaton
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(physics, astronomy) An ultrarelativistic interaction between two spinning black holes.
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(astrophysics) A theoretically possible, but physically highly unlikely, singularity from which matter and energy are able to escape but unable to enter; the antithesis of a black hole.
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