Posts tagged ‘loop quantum cosmology’

September 14th, 2014

Podcast: What Kinds of Multiverses are There?

by Max Andrews


Contemporary physics seem to indicate that there are good reasons, theoretically and physically, for an idea that there is a plurality of worlds. This concept has come to be understood as the multiverse. The multiverse is not monolithic but it is modeled after the contemporary understanding of an inflationary model of the beginning of this universe. Max Tegmark has championed the most prominent versions of the multiverse. Tegmark has made a four-way distinction.

Levels of the Multiverse

July 12th, 2012

The Multiverse Directory

by Max Andrews

I have gathered together all my posts relevant to the multiverse. Since this is one of the biggest topics on the blog, I thought having all the posts gathered into one place would make finding the content much easier.

  1. Quantum Entanglement and the Many Worlds Interpretation
  2. Cosmic Darwinism: Evolving Laws of Nature?
  3. A Theological Argument for Many Worlds
  4. Fine-Tuning of the Multiverse Lecture and PPT
  5. The Multiverse and Causal Abstract Objects
  6. An Outline of Tegmark’s Four Levels of the Multiverse
  7. This History of the Multiverse and the Philosophy of Science
  8. The Theological Attraction of the Multiverse
  9. Hugh Everett and the Many Worlds Interpretation
  10. Decoherence
  11. Physical Evidence of the Multiverse
  12. The Multiverse, Fine-Tuning, and Nomic Probabilities
  13. The Exceptions to the BVG Theorem
  14. Loop Quantum Cosmology in the Cosmic Microwave Background
  15. I’m Presenting a Paper at EPS on God and the Multiverse
  16. Plantingan Modal Realism
  17. Nonlocality as Evidence for a Multiverse Cosmology
    read more »

June 10th, 2012

Loop Quantum Cosmology in the Cosmic Background Radiation

by Max Andrews

Loop quantum gravity/cosmology is one of the newer and leading options for having a scientific explanation of the origin of the universe/multiverse.  I found a very interesting paper by Julien Grain with the Institut d’Astrophysique Spatiale, CNRS/Université in Paris, France.

The main requirement for a quantum gravity proposal is to solve for the pathological big bang singularities and this can be checked by computing the global evolution of the Universe in a quantum cosmological setting. However, it should be stressed out that such a global evolution cannot be probed directly as one cannot extract himself from the Universe to ‘see’ how it evolves in its primary ages. We are stuck inside the Universe and, from the inside, we are able to probe the physics of the early Universe via the Cosmic Microwave Background (CMB) anisotropies. The origin of such anisotropies are cosmological perturbations produced during a phase of accelerated expansion dubbed cosmic inflation… (See paper).