Radiation in a Closed/Finite Universe?

In summary, a closed and finite universe may not necessarily become more soaked in radiation than an open infinite universe, as the change in radiation density would depend on factors such as the topological scale and the presence of dark energy. However, towards the end of a contracting phase, a closed universe without dark energy may become radiation-dominated.
  • #1
wolram
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(if) our universe is closed and finite, would it become (soaked) in radiation
more readilly than an open infinite universe?
 
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  • #2
wolram said:
(if) our universe is closed and finite, would it become (soaked) in radiation
more readilly than an open infinite universe?

I don't think so, but one might naively expect an ordinary unity change in the radiation density in a finite universe with a small topological scale. If we were to see multiple images of objects, then clearly the simple 1/r^2 dilution wouldn't apply anymore.

Also, a closed universe without dark energy would eventually lead to a contracting phase, near the end of which the universe would become radiation-dominated.
 

1. What is radiation in a closed/finite universe?

Radiation in a closed/finite universe refers to the energy that is constantly emitted and absorbed by matter in the universe. This can include electromagnetic radiation, such as light, as well as other forms of radiation, such as heat or sound. In a closed/finite universe, this radiation is contained within the boundaries of the universe and cannot escape.

2. How does radiation affect the universe?

Radiation plays a crucial role in the evolution and dynamics of the universe. It is the primary means by which energy is transferred between objects in the universe and is responsible for regulating the temperature of the universe. Radiation also contributes to the expansion of the universe and can influence the formation of structures, such as galaxies and stars.

3. What is the source of radiation in a closed/finite universe?

The main source of radiation in a closed/finite universe is the thermal energy released by matter. This includes the energy produced by nuclear reactions in stars, as well as the heat emitted by other objects in the universe, such as planets and asteroids. Other sources of radiation in the universe include cosmic rays, which are high-energy particles, and electromagnetic radiation from sources such as black holes and supernovae.

4. How is radiation measured in a closed/finite universe?

Radiation is typically measured in terms of its intensity and frequency. The intensity of radiation is measured in units of energy per unit area per unit time, while the frequency refers to the number of oscillations or cycles of a wave in a given time. In a closed/finite universe, the intensity and frequency of radiation can vary depending on the source and distance from the source.

5. Is radiation harmful in a closed/finite universe?

The effects of radiation on living organisms depend on the intensity and duration of exposure. In a closed/finite universe, the amount of radiation is relatively low and poses minimal risk to living organisms. However, in certain regions of the universe, such as near black holes or supernovae, the intensity of radiation can be much higher and may have harmful effects on living organisms that are exposed to it.

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