horizon problem


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horizon problem

See inflation.

horizon problem

[hə′rīz·ən ‚präb·ləm]
(astronomy)
The problem of explaining the observed uniformity of the universe, and in particular of the cosmic background radiation, when, according to the standard big-bang theory, sources of radiation coming from opposite directions in the sky were separated by manyfold the horizon distance at the time of emission, and thus could not possibly have been in physical contact.
References in periodicals archive ?
For large corporations with actively traded stock, such market mechanisms help resolve the horizon problem.
While Obama's plan wouldn't grant any new leases until 2012, the Deepwater Horizon problem is casting a long shadow over the public comment process now going on in Virginia and other coastal states otherwise ready to sign on the dotted line for exploratory wells to go into their offshore waters.
Inflation is not needed because there does not exist the horizon problem.
The black hole universe does not exist the horizon problem, so that it does not need an inflation epoch.
The boundary of the black hole universe is the Schwarzschild absolute event horizon, so that the black hole universe does not have the horizon problem.
There is not the horizon problem and thus not need an inflation epoch.
While the demise of MCP as a producer-owned business has been well covered in the press, the spotlight has perhaps not focused as sharply as it should on the membership horizon problem the co-op was lacing at the time.
Another major factor was a horizon problem, in which the supposedly marketable equity shares in the co-op could not be sold due to a lack of other producers interested in investing in the plant.
In smaller cooperatives--particularly those in which the members are strongly tied to one another, whether by common social or religious beliefs--the horizon problem may be diminished by older members' moral obligation to their predecessors to leave a stronger cooperative to their heirs.
A cooperative is said to have an extreme horizon problem if:
MCP's situation met all the conditions for an extreme horizon problem.
He addresses stochastic approximation methods and the process of approximating value functions, and works through finite and infinite horizon problems, value function approximation for special functions, dynamic resource allocation problems and implementation problems.