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Results tagged with deformation-theory
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user 12482
for questions about deformation theory, including deformations of manifolds, schemes, Galois representations, and von Neumann algebras.
2
votes
Tamarkin-Tsygan Formalism
Well, this is probably not the deep insight you are looking for, but if you consider the polyvector fields on a manifold, you can first define the Lie derivative $L_X$ of a polyvector field $X$ on dif …
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3
votes
Open problems in deformation theory
Deformation theory is of course a very very wide field and one can take many different points of view on it. Working in deformation quantization, i.e. formal associative deformations of algebras and t …
2
votes
Is the algebra of sections of a bundle of complex Clifford algebra over an oriented Riemanni...
Let's try this: assume that the complex vector bundle you start with has even fiber dimension such that the corresponding Clifford algebra bundle is a bundle of complex matrix algebras. Suppose furthe …
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8
votes
Accepted
Some elementary questions about deformation quantization
a lot of questions, let me try on some of them :)
The bad news is that in most of the interesting situations the higher order terms of the star product, the $B_i$ will not vanish. Heuristically this …
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1
vote
How to compute the deformation quantizations of a polynomial Poisson algebra?
Not a complete answer but some observations. First it might be necessary not to take formal power series but formal Laurent series in order to get a reasonable behaviour of the Hochschild cohomology. …
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3
votes
Reverse Engineering to find deformation problem (from cohomology groups)?
In this generality, I would say that this is not possible: the same cohomology can be responsible for controlling quite different deformations problems.
Just an example: in formal deformation quantiz …
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14
votes
Deformation Quantization
Unfortunately, there is no real textbook on DQ around. One has Fedosov's book on his construction of star products including a detailed exposition of his index theorem.
There is a chapter on DQ in t …
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3
votes
graded generalization of the Moyal–Weyl product
Yes, it's just putting signs correctly. Martin Bordemann has a preprint from the 90s where he adapted Fedosov's construction in the graded setting. If you are only interested in the flat situation thi …
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6
votes
Accepted
Formal series convergence in deformation quantization and $C^*$-condition
OK, let me give a try on this question. There are several problems hidden underneath which one has to address.
First, for physical reasons a formal deformation is not sufficient. $\hbar$ is a constan …
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3
votes
Equivalence of star products on two differents Poisson algebras?
to 1) A $\mathbb{k}[[\hbar]]$-linear map between $A[[\hbar]]$ and $B[[\hbar]]$ is necessarily of the form $T = T_0 + \hbar T_1 + \cdots$ with $T_r\colon A \longrightarrow B$ being $\mathbb{k}$-linear …
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8
votes
Accepted
In the dictionary between Poisson and Quantum, what corresponds to Coisotropic?
Concerning your first question I have a couple of suggestions: first coisotropic is in some sense the best we can have in a truely Poisson situation: there is nothing like lagrangian (unfortunately).
…
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18
votes
Clifford algebras as deformations of exterior algebras
In addition to the answer of Bertram Arnold, let me point out that there is a very explicit formula for "fermionic" Weyl-Moyal product. Let us assume that your vector space $V$ (or module) is defined …
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