How to reformulate this in a CVX way

1

Please someone help me! I am stuck in this problem long time.
how to express this: norm(y)^3/x^2
I have already proved this convex in my previous topic.

2

Cubic over quad constraint This is an answer I found but it didn’t work.

3

I would think the constraint t\geq \|y\|^3/x^2 should be equivalent to something like geo_mean([t,x,x])>=norm(y).

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4

Yes! Thank you for your help Michal, really appreciated!