Cosmology & Gravitation

This series consists of talks in the areas of Cosmology, Gravitation and Particle Physics.

Seminar Series Events/Videos

Currently there are no upcoming talks in this series.

 

Tuesday Sep 22, 2009
Speaker(s): 

In addition to its ability to probe Inflation, CMB polarization offers the intriguing possibility to detect CP-symmetry violation. In some sense these predictions, if true, would be more surprising than confirmation of the inflationary paradigm -- for which ample, albeit circumstantial, evidence already exists. Moreover, recent theoretical predictions imply that, not only are parity violating CMB polarization effects possible, but that they have already been detected at 3\sigma confidence levels in existing polarization data.

Collection/Series: 
Scientific Areas: 

 

Tuesday Sep 08, 2009
Speaker(s): 

The standard model of cosmology has some puzzles/problems such as the
cosmological constant problem and the horizon problem which according to
many stem from our lack of understanding of the very early universe. This in turn means that almost none of the theories of quantum gravity are at a
stage where anything substantial can be said about observational cosmology.
In the past few years Causal Set theory has proved itself different in this
case where a possible solution to the Cosmological constant problem was

Collection/Series: 
Scientific Areas: 

 

Tuesday Sep 01, 2009
Speaker(s): 

We present the first year SDSS-II Supernova Survey results and their implications for cosmology and future supernova surveys. We then discuss challenges that face next-generation surveys, such as LSST, which will deliver of order a million supernovae without spectroscopic confirmation. As a way to address these challenges, we introduce BEAMS, a statistical method to do photometric supernova cosmology, and present a preliminary application to SDSS data.

Collection/Series: 
Scientific Areas: 

 

Friday Jul 31, 2009
Speaker(s): 

The Baryon Acoustic Oscillations (BAO) are the latest weapon in the quest for precision cosmology and dark energy. Many presentations on BAO are complicated and unclear and I will therefore present BAO with particular emphasis on trying to give the simplest theoretical description, both at the linear and nonlinear level, and will describe some of the observational challenges to measuring BAO.

Collection/Series: 
Scientific Areas: 

 

Tuesday Jul 14, 2009
Speaker(s): 

The standard theorist's model for the dynamics of galaxies is the limit of a Newtonian N-body system at fixed mass as the number of particles goes to infinity - i.e a phase space fluid After going over conventional wisdom, some interesting open issues which remain will be highlighted, and their relation to real galaxies explored.

Collection/Series: 
Scientific Areas: 

Pages