What specific phenomenon describes the alteration of CMB photon wavelengths as they pass through Quipu's gravity?

Answer

Integrated Sachs-Wolfe (ISW) effect

As Cosmic Microwave Background (CMB) photons pass through the gravitational potential wells created by massive structures like Quipu, their wavelengths are altered via the Integrated Sachs-Wolfe (ISW) effect.

What specific phenomenon describes the alteration of CMB photon wavelengths as they pass through Quipu's gravity?
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