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Unconventional Cosmology

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Quantum Gravity and Quantum Cosmology

Part of the book series: Lecture Notes in Physics ((LNP,volume 863))

Abstract

I review two cosmological paradigms which are alternative to the current inflationary scenario. The first alternative is the “matter bounce”, a non-singular bouncing cosmology with a matter-dominated phase of contraction. The second is an “emergent” scenario, which can be implemented in the context of “string gas cosmology”. I will compare these scenarios with the inflationary one and demonstrate that all three lead to an approximately scale-invariant spectrum of cosmological perturbations.

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Notes

  1. 1.

    This corresponds to the time reverse of entering a region of large-field inflation.

  2. 2.

    The gravitational wave tensor h ij can be written as the amplitude h multiplied by a constant polarization tensor.

  3. 3.

    We emphasize that it was important for us to have compact spatial dimensions in order to obtain the winding modes which are crucial to get the holographic scaling of the thermodynamic quantities.

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Acknowledgements

I wish to thank the organizers of this school for inviting me to give these lectures on the beautiful island of Naxos, and for their hospitality. I wish to thank all of my collaborators on whose work I have drawn. This work has been supported in part by funds from an NSERC Discovery Grant and from the Canada Research Chair program. I also acknowledge support from the Killam foundation for the period 9/09–8/11.

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  1. Physics Department, McGill University, 3600 University Street, Montreal, QC H3A 2T8, Canada

    Robert H. Brandenberger

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  1. Robert H. Brandenberger
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  1. CSIC, Instituto de Estructura de la Materia, Madrid, Spain

    Gianluca Calcagni

  2. Department of Physics, National Technical University of Athens, Athens, 15780, Greece

    Lefteris Papantonopoulos

  3. Department of Physics and Astronomy, The University of Tennessee, Nielsen Physics Building 210, Knoxville, 37996-1200, Tennessee, USA

    George Siopsis

  4. Crete Center for Theoretical Physics, Department of Physics, University of Crete, Physics Bldg. 203, Heraklion, 71003, Greece

    Nikos Tsamis

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Brandenberger, R.H. (2013). Unconventional Cosmology. In: Calcagni, G., Papantonopoulos, L., Siopsis, G., Tsamis, N. (eds) Quantum Gravity and Quantum Cosmology. Lecture Notes in Physics, vol 863. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-33036-0_12

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