**Former group member as postdoctoral fellow (1.10.2014-30.04.2018)**

Current affiliation:

Institute for Theoretical Physics

KU Leuven, Belgium

E-mail: manuel.kraemer [at] usz.edu.pl

**Research interests**

- Canonical quantum gravity and quantum cosmology

» Quantum-gravitational effects for inflationary perturbations and their imprint in the cosmic microwave background

» Singularity resolution in quantum-cosmological models

» Entanglement in quantum universes with varying fundamental couplings

» The multiverse from the third quantization formalism and its observational consequences

**List of publications**

» **INSPIRE publication list** » **INSPIRE profile**

- João Morais, Mariam Bouhmadi-López, Manuel Krämer, and Salvador Robles-Pérez,

,*Pre-inflation from the multiverse: Can it solve the quadrupole problem in the cosmic microwave background?*

European Physical Journal C**78**, 240 (2018), arXiv:1711.05138.

- Mariam Bouhmadi-López, Manuel Krämer, João Morais, and Salvador Robles-Pérez,

,*What if? Exploring the Multiverse through Euclidean wormholes*

European Physical Journal C**77**, 718 (2017), arXiv:1708.00025.

- Salvador Robles-Pérez, Adam Balcerzak, Mariusz P. Dąbrowski, and Manuel Krämer,

,*Interuniversal entanglement in a cyclic multiverse*

Physical Review D**95**, 083505 (2017), arXiv:1701.04773.

- David Brizuela, Claus Kiefer, and Manuel Krämer,

,*Quantum-gravitational effects on gauge-invariant scalar and tensor perturbations during inflation: The slow-roll approximation*

Physical Review D**94**, 123527 (2016), arXiv:1611.02932.

- David Brizuela, Claus Kiefer, and Manuel Krämer,

,*Quantum-gravitational effects on gauge-invariant scalar and tensor perturbations during inflation: The de Sitter case*

Physical Review D**93**, 104035 (2016), arXiv:1511.05545.

- Mariam Bouhmadi-López, Claus Kiefer, and Manuel Krämer,

,*Resolution of type IV singularities in quantum cosmology*

Physical Review D**89**, 064016 (2014), arXiv:1312.5976.

- Donato Bini, Giampiero Esposito, Claus Kiefer, Manuel Krämer, and Francesco Pessina,

,*On the modification of the cosmic microwave background anisotropy spectrum from canonical quantum gravity*

Physical Review D**87**, 104008 (2013), arXiv:1303.0531.

- Claus Kiefer and Manuel Krämer,

,*Quantum Gravitational Contributions to the Cosmic Microwave Background Anisotropy Spectrum*

Physical Review Letters**108**, 021301 (2012), arXiv:1103.4967.

**Essays**

- David Brizuela and Manuel Krämer,

,*The Search for a Tiny Hint from Quantum Gravity in the Cosmic Relic Radiation*

in: S. Hossenfelder (Ed.),*Experimental Search for Quantum Gravity*,

FIAS Interdisciplinary Science Series, Springer, 2018, pp. 9–14 (published online: November 2017).

- Claus Kiefer and Manuel Krämer,

,*Can effects of quantum gravity be observed in the cosmic microwave background?*

International Journal of Modern Physics D**21**, 1241001 (2012), arXiv:1205.5161.

»in the 2012 Essay Contest of the**First Award****Gravity Research Foundation** *Multiverse models in canonical quantum cosmology and their testability*

Talk at the**Wednesday Seminar**of the**Institute of Physics**, University of Szczecin – April 18, 2018*Pre-inflation from the multiverse and its effect on the cosmic microwave background*

**DPG-Frühjahrstagung**, Würzburg – March 23, 2018*Quantum Gravity in the CMB: From semiclassical effects to imprints of the multiverse*

Seminar talk at the**Department of Theoretical Physics and History of Science**, University of the Basque Country (UPV/EHU), Bilbao – November 20, 2017*Quantum-gravitational effects on primordial power spectra in slow-roll inflationary models*

**IV Cosmology and the Quantum Vacuum**, Segovia – September 5, 2017

»**Proceedings contribution:**David Brizuela and Manuel Krämer, Galaxies**6**, 6 (2018).*Applications of the third quantization formalism*

Talk at the**Group Seminar**of the**Gravitation and Relativity Group**, University of Cologne – April 18, 2017*Interuniversal entanglement in cyclic multiverse models*

**IberiCos 2017**, Valencia – April 12, 2017*Inter-universal entanglement in a cyclic multiverse model*

**DPG-Frühjahrstagung**, Bremen – March 17, 2017*Inter-universal entanglement in a cyclic multiverse*

**Segundo Encontro de Cosmologia e Gravitação à beira da Serra da Estrela**, Universidade da Beira Interior, Covilhã, Portugal – February 11, 2017*Singularity resolution in Wheeler–DeWitt quantum cosmology*

Invited talk at the conference**“Singularities of general relativity and their quantum fate”**, IMPAN, Warsaw – June 29, 2016*Quantum cosmology and applications of the Wheeler–DeWitt equation*

Talk at the**Institute Seminar**of the**Institute of Theoretical Physics**, University of Wrocław – April 22, 2016*Effects of canonical quantum gravity on inflationary perturbations*

**IberiCos 2016**, Vila do Conde, Portugal – March 31, 2016*How does canonical quantum gravity affect inflationary perturbations?*

**DPG-Frühjahrstagung**, Hamburg – March 3, 2016*How does canonical quantum gravity affect scalar and tensor perturbations during inflation?*

**19th annual International Conference on Particle Physics and Cosmology (COSMO-15)**, Warsaw – September 8, 2015*Quantum entanglement in the multiverse*

**Spring Cosmology Meeting 2015**, Międzywodzie – May 9, 2015*Quantum-gravitational effects for inflationary perturbations*

Talk at the**Seminar of Cosmology and Particle Physics**at the**Faculty of Physics**, University of Warsaw – April 21, 2015*Quantum gravity, inflation and the Cosmic Microwave Background*

Talk at the**Wednesday Seminar**at the**Institute of Physics**, University of Szczecin – April 15, 2015*Quantum-gravitational effects on scalar and tensor perturbations during inflation*

**DPG-Frühjahrstagung**, TU Berlin – March 17, 2015*Resolution of late-time singularities in quantum cosmology*

**14th British Gravity Meeting**, Cambridge – April 1, 2014*Recent applications of Wheeler–DeWitt quantum cosmology*

Invited talk at the**Friday Seminar**of the**Szczecin Cosmology Group**, University of Szczecin – March 21, 2014*Resolution of type IV singularities in quantum cosmology*

**DPG-Frühjahrstagung**, HU Berlin – March 17, 2014*Applications of Quantum Cosmology*

Invited talk at the seminar**“Theorie-Palaver”**, Institut für Physik, Johannes Gutenberg-Universität Mainz – January 28, 2014*Potential observational effects from Wheeler–DeWitt quantum cosmology*

»**Strings, Cosmology and Gravity Student Conference 2013**, MPI für Physik, Munich – November 9, 2013 » Slides

»**LOOPS 13**, Perimeter Institute, Waterloo, Ontario, Canada – July 23, 2013 » Recorded talk*Potential observational effects from a semiclassical approximation to Quantum Gravity*

**20th International Conference on General Relativity and Gravitation (GR20)**, Warsaw – July 12, 2013*The modification of the primordial power spectrum from canonical quantum gravity*

**8. Kosmologietag**, Bielefeld – April 26, 2013*Singularity avoidance in quantum cosmology*

**DPG-Frühjahrstagung**, Jena – March 1, 2013*Can effects of quantum gravity be observed in the cosmic microwave background?*

»**Postgrad Encounters on Fundamental Physics**, Barcelona – October 18, 2012

»**13th Marcel Grossmann Meeting**, Stockholm – July 2, 2012 »**Proceedings contribution:**arXiv:1303.1544

»**Relativity and Gravitation – 100 Years after Einstein in Prague**, Prague – June 27, 2012

»**Group Seminar**of the**Gravitational Physics Group**at the**Instituto de Estructura de la Materia**, Madrid – June 11, 2012*Quantum gravitational effects for cosmological perturbations*

**DPG-Frühjahrstagung**, Göttingen – March 1, 2012*Quantum Gravitational Contributions to the CMB Anisotropy Spectrum*

»**4th Strings, Cosmology and Gravity Student Conference (SCGSC)**, London – November 3, 2011

»**6. Kosmologietag**, Bielefeld – May 5, 2011

»**DPG-Frühjahrstagung**, Karlsruhe – March 28, 2011*The interacting multiverse and its effect on the CMB*– March 9, 2018*The recent debate about the no-boundary proposal*– January 19, 2018*Wormholes and entanglement*– December 8, 2017*Pre-inflation from the multiverse and its effect on the CMB*– October 13, 2017*Imprints of an interacting multiverse in the CMB power spectrum*– March 3, 2017*Quantum-gravitational effects on primordial power spectra in the slow-roll approximation*– January 13, 2017*Entanglement in a cyclic multiverse*– October 14, 2016*Interacting universes*– June 10, 2016*Third quantization and varying constants*– October 16, 2015*Quantum-gravitational effects on scalar and tensor perturbations during inflation*– December 12, 2014

**Talks at conferences and institute seminars**

**Talks at the Friday Seminars of the Szczecin Cosmology Group**