University of Cambridge > Talks.cam > DAMTP Friday GR Seminar > Orthogonal non-Gaussianities from DBI Galileon inflation

  Browse A-Z

Log in

University Account External (via Google)

🔐 Log In

Information on

Subscribing to talksdetails Finding a talkdetails Adding a talkdetails Disseminating talksdetails Help and Documentationdetails

ℹ️ Information

Orthogonal non-Gaussianities from DBI Galileon inflation

Download to your calendar using vCal

If you have a question about this talk, please contact Dr Sebastien Renaux-Petel .

We study the cosmology of the multifield relativistic Galileon model in which an induced gravity term is added to the Dirac-Born-Infeld action. We highlight the physical insight that is gained by employing a bimetric perspective in which the induced gravity and Einstein-Hilbert action are treated on equal footing. We derive the conditions under which a phase of quasi exponential inflation can be sustained and demonstrate the existence of a critical background energy density above which cosmological fluctuations become ghosts. At the non-linear level, this scenario provides the first concrete early Universe model in which the shape of the bispectrum can be predominantly of orthogonal type. More generally, we show that the shape and sign of the primordial non-Gaussianities act as a powerful discriminant of the precise strength of the induced gravity.

This talk is part of the DAMTP Friday GR Seminar series.

This talk is included in these lists:

Note that ex-directory lists are not shown.

Other lists

CISA Panel on Political Parties Bateman Auditorium, Gonville & Caius College Average on Sundays: 7438.14189189 kWh

Other talks

Tea and Coffee Break TBC What Can a Spectrum Learn? AI Perspectives on the Kohn Laplacian of Sphere Quotients Coexisting with carnivores? The lynx and wolf reintroduction debate Nature and law Online Causal Inference Seminar
 

© 2006-2025 Talks.cam, University of Cambridge. Contact Us | Help and Documentation | Privacy and Publicity