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- W2152041012 abstract "The importance of manifest diffeomorphism invariance is often cited as a major strength of the loop approach to the quantization of gravity. We study this in a simple example: The world‐sheet theory of the bosonic string. The conventional treatment differs in the choice of vacuum state from the loop inspired one, the latter being invariant while the first being only covariant. We argue that physically only covariance is required and display the physical consequences of the invariant but discontinuous choice in the one dimensional example of the harmonic oscillator. Finally, we demonstrate that discretization of infinitesimally singular expressions as common in the loop approach is not unique but can be seen in analogy with the choice of higher derivative counter terms." @default.
- W2152041012 created "2016-06-24" @default.
- W2152041012 creator A5030400527 @default.
- W2152041012 date "2009-01-01" @default.
- W2152041012 modified "2023-09-23" @default.
- W2152041012 title "A Lesson from the LQG String: Diffeomorphism Covariance is Enough" @default.
- W2152041012 doi "https://doi.org/10.1063/1.3284378" @default.
- W2152041012 hasPublicationYear "2009" @default.
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