Simon Fraser University
SFU Cosmology Seminars

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Thursday, 2 October 2008, 14:00 in IRMACS

Prof. Andrei Frolov (SFU)

A singularity problem with f(R) dark energy

I will talk about a curvature singularity problem appearing on non-linear level that generally plagues f(R) models that modify Einstein gravity in the infrared. It is caused by the fact that for the effective scalar degree of freedom, the curvature singularity is at a finite field value and energy level, and can be easily accessed by the field dynamics in the presence of matter. Consequences for observational viability are grave: regular static solutions for neutron stars do not exist in many IR-modified f(R) models. I will discuss whether the theory can be saved by an UV-completion.

Seminars in 2008:

2008-09-25 14:00 in IRMACS - Dmitri Korotkin (Concordia University): Canonical quantization of Einstein-Rosen gravitational waves with two polarizations
2008-10-02 14:00 in IRMACS - Andrei Frolov (SFU): A singularity problem with f(R) dark energy
2008-11-14 14:30 in AQ3181 - Robert Brandenberger (McGill University): String theory and the very early universe (physics colloquium)
2009-01-23 14:30 in P8445B - Fotini Markopoulou (Perimeter): Two ways to derive a spacetime in quantum gravity
2009-01-27 14:00 in P8445A - Edward Chapin (UBC): Detecting massive star-forming galaxies at z>1 using BLAST and SCUBA-2 submillimetre wavelength surveys
2009-02-03 14:00 in P8445A - Subinoy Das (UBC): Late forming dark matter
2009-02-20 14:30 in AQ3182 - Mark Trodden (Syracuse University): Gravitational approaches to cosmic acceleration (physics colloquium)
2009-02-24 14:00 in P8445A - Adam Ritz (University of Victoria): Probing pseudoscalar perturbations with CMB polarization
2009-03-03 14:00 in P8445A - John Ward (University of Victoria): Gravitational wave constraints on multi-brane inflation
2009-03-10 14:00 in P8445A - Phil Gregory (UBC): Mining for extra-solar planets with a Bayesian MCMC Kepler periodogram
2009-03-27 14:30 in AQ3182 - Suzanne Staggs (Princeton University): The impact of the last 13 billion years and of the first 10-35 seconds on the CMB (physics colloquium)
2009-05-05 14:00 in P8445B - Justin Khoury (University of Pennsylvania): Cascading gravity
2009-07-21 14:00 in P8445B - Daniele Steer (APC, Paris): Multi-field DBI inflation: primordial perturbations and non-Gaussianities

[ See complete seminar archives | iCal feed ]

Modified by Andrei Frolov <frolov@sfu.ca> on 2023-11-01