Monstrous Moonshine & Quantum Gravity: Where Does 196883 Come From?

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In summary, the number 196883 (196884) appears in both math and quantum gravity. In math, it comes from the moonshine conjectures, which were proven using the "FLM" bosonic string. In quantum gravity, it appears as the number of dimensions in the Hilbert space of a type of minimal "BTZ" black hole in 2+1 dimensions. This connection was suggested by E. Witten in 2007 and is based on the duality between pure quantum gravity and extremal holomorphic CFTs. However, this idea has not yet been fully confirmed and may require further exploration.
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tzimie
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According to a 2007 hypothesis of Witten, it would be the number of dimensions in the Hilbert space of a type of minimal "BTZ" black hole in 2+1 dimensions - minimal because purely gravitational, it's a scenario in which no other fields are present. The moonshine conjectures were proven by Borcherds using the "FLM" bosonic string, whose vibrations are restricted to a particular 24-dimensional space. If I understand correctly, these restrictions also prevent the string from having anything other than gravitational (spin-2) excitations, so it would be appropriate to model purely gravitational physics.

However, the 2007 idea has never quite been made to work (this might be the latest attempt). Maybe it requires bosonic M-theory compactified on the FLM space; who knows.
 
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I think it comes in via the duality of QG and extremal holomorphic CFTs under the assumption that the cosmological constant can be negative. If so then moonshine would be one such example:

{quote]
Conjectured relationship with quantum gravity
In 2007, E. Witten suggested that AdS/CFT correspondence yields a duality between pure quantum gravity in (2+1)-dimensional anti de Sitter space and extremal holomorphic CFTs. Pure gravity in 2+1 dimensions has no local degrees of freedom, but when the cosmological constant is negative, there is nontrivial content in the theory, due to the existence of BTZ black hole solutions. Extremal CFTs, introduced by G. Höhn, are distinguished by a lack of Virasoro primary fields in low energy, and the moonshine module is one example.
[/quote]

from the wikipedia article:
https://en.wikipedia.org/wiki/Monstrous_moonshine
 

1. What is Monstrous Moonshine & Quantum Gravity?

Monstrous Moonshine is a mathematical theory proposed by John Conway and Simon Norton in the 1970s. It describes a surprising connection between two seemingly unrelated mathematical objects: the Monster group (a very large finite group) and modular forms (a type of mathematical function). Quantum gravity is a theoretical framework that aims to reconcile the theories of general relativity and quantum mechanics, which are currently incompatible.

2. What is the significance of the number 196883 in this theory?

The number 196883 is the coefficient of the smallest non-trivial term in the j-function, a particular type of modular form. This number is significant because it is closely related to the dimension of the smallest irreducible representation of the Monster group, which is a crucial element in Monstrous Moonshine.

3. How does Monstrous Moonshine relate to quantum gravity?

Monstrous Moonshine and quantum gravity are both attempts to understand the fundamental nature of the universe. The connection between the Monster group and modular forms in Monstrous Moonshine has been shown to have implications for the structure of spacetime in quantum gravity theories.

4. What evidence supports the connection between Monstrous Moonshine and quantum gravity?

While the connection between Monstrous Moonshine and quantum gravity is still a topic of ongoing research and debate, there have been several theoretical and computational studies that support this connection. For example, some researchers have found that certain characteristics of the Monster group and modular forms match with predictions made by quantum gravity theories.

5. How does understanding this connection benefit us?

By studying the relationship between Monstrous Moonshine and quantum gravity, scientists hope to gain a deeper understanding of the fundamental nature of the universe. This could potentially lead to advancements in our understanding of other areas of physics, such as black holes and the early universe. It may also have practical applications in fields such as cryptography and coding theory.

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