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marcus

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http://www.gravity.physik.fau.de/events/cosmo2015/cosmo2015.shtml

Quantum gravity effects are expected to play a prominent role in the early universe as for example in the context of primordial gravitational waves or are expected to manifest in finger prints in the cosmic microwave background. After the expected publications of the new Planck data by the end of 2014 this workshop aims to bring together researchers from quantum gravity as well as from cosmology with links to current experiments, which are interesting also from the quantum gravity perspective.

The workshop will be held at the FAU-Erlangen-Nürnberg from 9th to 13th of February and participants will be experts equally distributed from both research areas. The workshop will be comprised of introductory talks of quantum gravity and comsomology with a particular focus on topics interesting for both communities as well as specialized talks and ample time for discussion, to stimulate interaction between the participants.

The workshop will start on Monday 9th of February at 3 pm and will end on Friday 13th of February at 1 pm. The detailed program will be available on the homepage soon.

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My comment: invited speakers with Loop involvement are Agullo, Ashtekar, Gielen, Thiemann, Wilson-Ewing. Likewise one of the organizers, Giesel.

It makes sense for some Loop researchers to become increasingly interested in cosmology because that is where QG has the greatest contact with observation.

AFAICS recovering classical GR was accomplished in the CHRR paper (Chirco, Haggard, Riello, Rovelli) showing that GR can simply be the equation of state of QG degrees of freedom, after Jacobson 1995.

So one has at least one valid QG theory---the next important order of business is to test theory by confronting it with early universe observations.

There can be several versions of Loop QG all of which recover GR as EoS. One wants to test them to see which best fits observations of ancient light.

A representative paper along these lines is the "LambdaCDM bounce" paper by Cai and Wilson-Ewing. [to get it simply google LambdaCDM bounce]. Notice that Wilson-Ewing is one of the speakers at the workshop. The C&W-E paper puts the standard cosmic model LCDM together with the loop cosmology bounce and gets constraints on some observable numbers.

**First Erlangen Workshop on Cosmology and Quantum Gravity**Quantum gravity effects are expected to play a prominent role in the early universe as for example in the context of primordial gravitational waves or are expected to manifest in finger prints in the cosmic microwave background. After the expected publications of the new Planck data by the end of 2014 this workshop aims to bring together researchers from quantum gravity as well as from cosmology with links to current experiments, which are interesting also from the quantum gravity perspective.

The workshop will be held at the FAU-Erlangen-Nürnberg from 9th to 13th of February and participants will be experts equally distributed from both research areas. The workshop will be comprised of introductory talks of quantum gravity and comsomology with a particular focus on topics interesting for both communities as well as specialized talks and ample time for discussion, to stimulate interaction between the participants.

**Invited Speakers**- Niayesh Afshordi (University of Waterloo
- Ivan Agullo (Louisiana State University)
- Abhay Ashtekar (Pennsylvania State University)
- Tessa Baker (Oxford University)
- Camille Francois Bonvin (CERN)
- Latham Boyle (Perimeter Institute)
- Edmund Copeland (University of Nottingham)
- Raphael Flauger (Princeton University)
- Ghazal Geshnizjani (University of Waterloo
- Steffen Gielen (Imperial College London)
- Jean-Luc Lehners (Albert Einstein Institute Golm)
- Lucas Lombriser (University of Edinburgh)
- Oriol Pojolas (IFAE and Universitat Autonoma de Barcelona)
- Tehseen Rug (LMU Munich)
- Angnis Schmidt-May (ETH)
- Thomas Thiemann (University of Erlangen-Nürnberg)
- Edward Wilson-Ewing (Albert Einstein Institute Golm)

**Local organizing Committee**- Kristina Giesel (University of Erlangen-Nürnberg)
- Stefan Hofmann (LMU Munich)
- Jochen Weller (LMU Munich)

**Program**The workshop will start on Monday 9th of February at 3 pm and will end on Friday 13th of February at 1 pm. The detailed program will be available on the homepage soon.

======================

My comment: invited speakers with Loop involvement are Agullo, Ashtekar, Gielen, Thiemann, Wilson-Ewing. Likewise one of the organizers, Giesel.

It makes sense for some Loop researchers to become increasingly interested in cosmology because that is where QG has the greatest contact with observation.

AFAICS recovering classical GR was accomplished in the CHRR paper (Chirco, Haggard, Riello, Rovelli) showing that GR can simply be the equation of state of QG degrees of freedom, after Jacobson 1995.

So one has at least one valid QG theory---the next important order of business is to test theory by confronting it with early universe observations.

There can be several versions of Loop QG all of which recover GR as EoS. One wants to test them to see which best fits observations of ancient light.

A representative paper along these lines is the "LambdaCDM bounce" paper by Cai and Wilson-Ewing. [to get it simply google LambdaCDM bounce]. Notice that Wilson-Ewing is one of the speakers at the workshop. The C&W-E paper puts the standard cosmic model LCDM together with the loop cosmology bounce and gets constraints on some observable numbers.

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