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Suekdccia
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- TL;DR Summary
- Sachs-Wolfe effect in Dark Energy universe?
The integrated Sachs-Wolfe effect occurs when a photon goes through a gravitational potential that changes due to spacetime expansion (presumably caused by dark energy). For that reason, a photon going through a gravitational well would gain energy (blueshift) when entering and it would lose energy (redshift) when exiting it. If the universe expands, the well becomes "less deep" and therefore, the photon gets more energy and becomes blueshifted.
However, would this effect still occur if we had a photon traveling in a universe with only one galaxy (the Milky Way) and the rest of it dominated by Dark Energy (that is, the Universe once the expansion separates all non-gravitationally bounded structures to us)?
However, would this effect still occur if we had a photon traveling in a universe with only one galaxy (the Milky Way) and the rest of it dominated by Dark Energy (that is, the Universe once the expansion separates all non-gravitationally bounded structures to us)?