cosmology, comoving distance and proper distance (or physical distance) are two closely related distance measures used by cosmologists to define distances between...
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with time, as comoving distance accounts for the expansion of the universe. Comoving distance is obtained by integrating the proper distances of nearby fundamental...
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Expansion of the universe (redirect from The Big Bang and The Great Expansion)
disadvantage of wrongly implying that the expansion has a center and an edge. Comoving and proper distances Overbye, Dennis (20 February 2017). "Cosmos Controversy:...
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tensor that is normalized to use a distance, or that uses geometrized units. Invariant interval Proper time Comoving distance Relativity of simultaneity Moses...
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Faster-than-light (section Proper speeds)
of velocity are also discussed in Comoving and proper distances § Uses of the proper distance). The current distance to this cosmological event horizon...
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Hubble's law (redirect from Hubble distance)
the universe for a given comoving time. D is the proper distance (which can change over time, unlike the comoving distance, which is constant) from the...
130 KB (12,876 words) - 04:26, 30 December 2024
Observable universe (redirect from Groups and clusters of galaxies)
corresponds to a comoving volume of about 1.22×104 Gpc3 (4.22×105 Gly3 or 3.57×1080 m3). These are distances now (in cosmological time), not distances at the time...
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quasar, and Lyman-alpha blob located near the border of the constellations Canes Venatici and Coma Berenices, with the projected comoving distance of approximately...
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A proper frame, or comoving frame, is a frame of reference that is attached to an object. The object in this frame is stationary within the frame, which...
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existence, properties, and significance of a cosmological horizon depend on the particular cosmological model. In terms of comoving distance, the particle horizon...
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cosmological horizon, the comoving horizon (in Scott Dodelson's text), or the cosmic light horizon) is the maximum distance from which light from particles...
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proper distance provides a measurement of how far a galaxy is at a fixed moment in time. At the present time the proper distance equals the comoving distance...
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largest comoving distance from which light emitted in the past could reach the observer at a given time. For events that occur beyond that distance, light...
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Length contraction (section Known proper length)
a comoving observer; though it "really" exists, i.e. in such a way that it could be demonstrated in principle by physical means by a non-comoving observer...
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transformation" for proper reference frames or proper coordinates (German: Eigensystem, Eigenkoordinaten) by using comoving Frenet–Serret tetrads, and applied this...
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Coordinate Time (TCB) is based on a reference frame comoving with the barycenter of the Solar System, and has been defined for use in calculating motion of...
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frame of reference, as well as for the special case of proper acceleration measured by a comoving accelerometer. Another useful formalism is four-acceleration...
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describe the more realistic scenario of constant proper acceleration, i.e. the acceleration indicated by a comoving accelerometer. This leads to hyperbolic motion...
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Special relativity (section Origins and significance)
frame can always be found that is momentarily comoving with the particle. This frame, the momentarily comoving reference frame (MCRF), enables application...
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called the "comoving transverse distance" DM by the equation DL = (1 + z) DM, where z is the redshift, and the comoving transverse distance is itself equal...
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Rindler coordinates (section Notions of distance)
time T = 0 at position X = 1/α (with α as the constant proper acceleration measured by a comoving accelerometer), then the hyperbolic coordinates are often...
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object at redshift, z {\displaystyle z} , is expressed in terms of the comoving distance, r {\displaystyle r} as: d A = S k ( r ) 1 + z {\displaystyle d_{A}={\frac...
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A and the encounter with Earth at D is on the muon's worldline, only a clock comoving with the muon and thus resting in S′ can indicate the proper time...
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the proper distance (which can change over time, unlike the comoving distance d C {\displaystyle d_{C}} which is constant and set to today's distance) between...
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Accelerating frames require that one understand the concept of a momentarily comoving reference frame (MCRF), which is to say, a frame traveling at the same...
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V1400 Centauri (section Name and catalogue history)
Centaurus–Lupus subgroup of the Scorpius–Centaurus association, a group of young, comoving stars close to the Sun. The star has been catalogued in as early as the...
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61 Cygni (category Gliese and GJ objects)
1934, and orbital elements were published. In 1911, Benjamin Boss published data indicating that the 61 Cygni system was a member of a comoving group...
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Gliese 900 (category Gliese and GJ objects)
Suárez, Genaro; Gerasimov, Roman (2024-06-01). "89 New Ultracool Dwarf Comoving Companions Identified with the Backyard Worlds: Planet 9 Citizen Science...
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Gamma Geminorum (category Stars with proper names)
Shaya, Ed J.; Olling, Rob P. (January 2011), "Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue"...
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density, pressure and cosmological constant all equal zero and the spatial curvature is negative.[citation needed] From these assumptions and the Friedmann...
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