How does the quasi-normal mode effect a black hole?

Answer 1

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Well you see,
The crystallographic restriction theorem in its basic form is the observation that the rotational symmetries of a crystal are limited to 2-fold, 3-fold, 4-fold, and 6-fold. This is strictly true for the mathematical formalism, but in the physical world crystals are finite, and quasicrystals occur with other symmetries, such as 5-fold.

In mathematics, a crystal is modeled as a discrete lattice, generated by a list of independent finite translations (Coxeter 1989). Because discreteness requires that the spacings between lattice points have a lower bound, the group of rotational symmetries of the lattice at any point must be a finite group. The force of the theorem is that not all finite groups are compatible with a discrete lattice; in any dimension, we will have only a finite number of compatible groups.

That is it

Answer 2

It doesn't really affect a black hole, in a way it's the other way around. First of all to describe a quasinormal mode, imagine a very large bell and you bang on it with a large hammer. The bell will vibrate, if the ringing went on indefinitely it would be its normal mode but as the ringing decays and eventually stops it falls into the quasinormal mode category. In simple terms, quasinormal is something that normally occurs but not forever.
One of the questions about black holes is: does it "have hair". In other words, is it perfectly spherical or does it have little bumps, little "hairs". It is believed that they are perfectly spherical at some point in the evolution but will go through quasinormal states which are described by linearized differential equations of general relativity constraining perturbations around a black hole with a complex eigenvalue (i.e. frequency) which in English means black holes will vibrate as they lose their hair.

As for the previous answer (though it was more of a question than an answer), the reason we ask these questions is the same reason that someone asked "What fogged up my photographic negative", "What makes permenant magnets work", "How does the human heart work"? These and virtually an infinite number of others is why your computer even exists and why at some point in your life, us knowing how the heart works might save your life. We have no idea what we will find and discover as we ask and then try to find the answers to these "useless" questions. The day the human race loses its collective curiosity, we might as well pack up and vacate the building.

Answer 3

Why does it seem like everybody is studying things that exist only in theories, most of which have nothing to do with reality??? Black holes, dark power, worm holes, big bang theory?? Don't you ever learn anything useful? Like how to spell and use the written English language?