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arxiv 1906.05686 v2 pith:BDC3U5FW submitted 2019-06-13 gr-qc hep-thmath-phmath.MP

Towards Gaussian states for loop quantum gravity

classification gr-qc hep-thmath-phmath.MP
keywords statesquantumalgebradegreesfreedomgaussiangravityloop
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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An important challenge in loop quantum gravity is to find semiclassical states - states that are as close to classical as quantum theory allows. This is difficult because the states in the Hilbert space used in LQG are excitations over a vacuum in which geometry is highly degenerate. Additionally, fluctuations are distributed very unevenly between configuration and momentum variables. Coherent states that have been proposed to balance the uncertainties more evenly can, up to now, only do this for finitely many degrees of freedom. Our work is motivated by the desire to obtain Gaussian states that encompass all degrees of freedom. To obtain a toy-model we reformulate the U(1) holonomy-flux algebra in any dimension as a Weyl algebra, and discuss generalisations to SU(2). We then define and investigate a new class of states on these algebras which behave like quasifree states on the momentum variables.

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