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The noncommutative Chern-Simons theory itself is an example of an exotic noncommutative field theory: a quantum field theory on a space where the coordinates do not commute.

The authors revisit these noncommutative theories and show that they capture the Hall viscosity of the Laughlin states, as well as other geometric properties of these states that are of current interest.

The authors show here that geometric properties of Laughlin fractional quantum Hall states are accurately described by the Chern-Simons matrix model, a regularization of the noncommutative Chern-Simons theory description of these states.The four approaches stem from two choices of gauge and two ways of computing the response functions.The present formalism can readily be extended to generate gauge invariant responses for higher-order nonlinear processes. 13 -- Battery maker Contemporary Amperex Technology Co.’s prospectus for an initial public offering on the Growth Enterprise Market outlines plans for the firm to issue at most 217,243,733 shares, accounting for more than 10 percent of its share capital upon issuance.The group expects to raise USD1.97 billion (CNY13.12 billion), which it will invest in its lithium power cell production base as well as research and development.

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