### Abstract

Loop quantum cosmology attempts to understand the full dynamics of loop quantum gravity by realizing crucial effects in simpler, usually symmetric settings. Several subtleties arise especially when cosmological questions are to be addressed, related to possible mini-superspace artefacts, consistent cosmological perturbation theory, and quantum space-time structure. Recent work on inhomogeneous perturbations has highlighted some of the dangers of an over-reliance on simple models, sometimes not just reduced by symmetry but also in the possible forms of matter or quantum corrections. Only a consistent treatment of inhomogeneity, taking into account the full gauge structure related to general covariance, can show what happens at high densities in quantum gravity. The relevant methods and results (especially effective equations, potential observational signatures, singularity resolution and signature change) are surveyed in here.

Original language | English (US) |
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Title of host publication | Quantum Gravity and Quantum Cosmology |

Editors | Gianluca Calcagni, Lefteris Papantonopoulos, George Siopsis, Nikos Tsamis |

Pages | 149-184 |

Number of pages | 36 |

DOIs | |

State | Published - Jan 1 2013 |

### Publication series

Name | Lecture Notes in Physics |
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Volume | 863 |

ISSN (Print) | 0075-8450 |

### Fingerprint

### All Science Journal Classification (ASJC) codes

- Physics and Astronomy (miscellaneous)

### Cite this

*Quantum Gravity and Quantum Cosmology*(pp. 149-184). (Lecture Notes in Physics; Vol. 863). https://doi.org/10.1007/978-3-642-33036-0_7

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*Quantum Gravity and Quantum Cosmology.*Lecture Notes in Physics, vol. 863, pp. 149-184. https://doi.org/10.1007/978-3-642-33036-0_7

**Loop quantum cosmology, space-time structure, and falsifiability.** / Bojowald, Martin.

Research output: Chapter in Book/Report/Conference proceeding › Chapter

TY - CHAP

T1 - Loop quantum cosmology, space-time structure, and falsifiability

AU - Bojowald, Martin

PY - 2013/1/1

Y1 - 2013/1/1

N2 - Loop quantum cosmology attempts to understand the full dynamics of loop quantum gravity by realizing crucial effects in simpler, usually symmetric settings. Several subtleties arise especially when cosmological questions are to be addressed, related to possible mini-superspace artefacts, consistent cosmological perturbation theory, and quantum space-time structure. Recent work on inhomogeneous perturbations has highlighted some of the dangers of an over-reliance on simple models, sometimes not just reduced by symmetry but also in the possible forms of matter or quantum corrections. Only a consistent treatment of inhomogeneity, taking into account the full gauge structure related to general covariance, can show what happens at high densities in quantum gravity. The relevant methods and results (especially effective equations, potential observational signatures, singularity resolution and signature change) are surveyed in here.

AB - Loop quantum cosmology attempts to understand the full dynamics of loop quantum gravity by realizing crucial effects in simpler, usually symmetric settings. Several subtleties arise especially when cosmological questions are to be addressed, related to possible mini-superspace artefacts, consistent cosmological perturbation theory, and quantum space-time structure. Recent work on inhomogeneous perturbations has highlighted some of the dangers of an over-reliance on simple models, sometimes not just reduced by symmetry but also in the possible forms of matter or quantum corrections. Only a consistent treatment of inhomogeneity, taking into account the full gauge structure related to general covariance, can show what happens at high densities in quantum gravity. The relevant methods and results (especially effective equations, potential observational signatures, singularity resolution and signature change) are surveyed in here.

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UR - http://www.scopus.com/inward/citedby.url?scp=84870551311&partnerID=8YFLogxK

U2 - 10.1007/978-3-642-33036-0_7

DO - 10.1007/978-3-642-33036-0_7

M3 - Chapter

AN - SCOPUS:84870551311

SN - 9783642330353

T3 - Lecture Notes in Physics

SP - 149

EP - 184

BT - Quantum Gravity and Quantum Cosmology

A2 - Calcagni, Gianluca

A2 - Papantonopoulos, Lefteris

A2 - Siopsis, George

A2 - Tsamis, Nikos

ER -