Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A cyclic extension of the earthquake flow   Let $\cT$ be Teichm\"uller space of a closed surface of genus at least 2. For
any point $c\in \cT$, we describe an action of the circle on $\cT\times \cT$,
which limits to the earthquake flow when one of the parameters goes to a
measured lamination in the Thurston boundary of $\cT$. This circle action
shares some of the main properties of the earthquake flow, for instance it
satisfies an extension of Thurston's Earthquake Theorem and it has a complex
extension which is analogous and limits to complex earthquakes. Moreover, a
related circle action on $\cT\times \cT$ extends to the product of two copies
of the universal Teichm\"uller space.

11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat