Homepage

Contact

Name

Larissa Lorenz

Position

Former member
Member from September 2009 to July 2011
Current position: Researcher in Future Technologies and Innovation (Bauhaus Luftfahrt e.V., Munich)

Projects

Research directions:

Cosmology and General Relativity

Non-active projects

Cosmic inflation

Christophe Ringeval

The first measurements of acoustic peaks in the CMB anisotropies strongly suggest that the birth of cosmological fluctuations may have taken place during an early inflationary era of the universe.
In this domain, our activities deal with the construction of explicit models of inflation as well as the extraction of their observable consequences. Our fields of expertise comprise some actively debated subjects as the existence of features (e.g. trans-Planckian effects), inflation with non-minimally coupled scalar fields, DBI- and brane inflation as in the context of String Theory.
For all these theories, we are maintaining various numerical tools such as the ASPIC and FieldInf librairies allowing to compute reheating-consistent predictions for comparison with cosmological data.

External collaborators: Jérôme Martin (IAP, Paris, France), Vincent Vennin (Portsmouth, U.K.), Sébastien Clesse (RWTH, Aachen, Germany).

Cosmic strings

Christophe Ringeval

Based on our knowledge of particle physics at very high energy, cosmic strings are a natural consequence of the symmetry breaking mechanism and are expected to be formed during the cooling of the universe. However, they have not been observed yet and our research is concentrated into the various effects they may have in cosmology. The technical difficulties to deal with such systems are overcome using super-computer numerical simulations. We are focusing our present work to the effects induced in the CMB and in other astrophysical observables.

External collaborators: Jun'ichi Yokoyama (University of Tokyo, Japan), Daisuke Yamauchi (RESCUE, Tokyo, Japan), Mairi Sakellariadou (King's College London, U.K.), Patrick Peter, François Bouchet (Institut d'Astrophysique de Paris, France).

Publications in IRMP

All my publications on Inspire

Number of publications as IRMP member: 3

2011

CP3-11-16: Observational signatures of a non-singular bouncing cosmology

Marc Lilley, Larissa Lorenz, Sebastien Clesse

[Abstract] [PDF] [Journal] [Dial]
Published in JCAP 06 (2011) 004.
Refereed paper. April 19.

2010

CP3-10-21: Cosmic string loop distribution on all length scales and at any redshift

Larissa Lorenz, Christophe Ringeval and Mairi Sakellariadou

[Abstract] [PDF] [Journal] [Dial]
Published in JCAP 10 (2010) 003

Refereed paper. June 7.

CP3-10-15: Geometrically Consistent Approach to Stochastic DBI Inflation

Larissa Lorenz, Jerome Martin, Jun'ichi Yokoyama

[Abstract] [PDF] [Journal] [Dial]
Published in Phys. Rev. D82, 023515 (2010)
Refereed paper. April 22.