PIRSA Logo


PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE

Displaying all lectures given by: Andreas Albrecht


Infinity, Finiteness and Inflationary Cosmology
Speaker(s): Andreas Albrecht
Abstract: I analyze the various roles of infinity in current thinking about cosmology. Topics include initial conditions, attractor behavior, inflation and the precision and meaning of quantum measurements. I review the de Sitter equilibrium cosmology as an example of a finite cosmology, and present some new ... read more
Date: 14/07/2011 - 9:00 am

Inflation, infinity, equilibrium and the observable Universe
Speaker(s): Andreas Albrecht
Abstract: Cosmic inflation has given us a remarkably successful cosmological phenomenology. But the original goal of explaining why the cosmos is *likely* to take the form we observe has proven very difficult to realize. I review the status of "eternal inflation" with an eye on the roles var... read more
Date: 15/06/2011 - 2:00 pm
Series: Colloquium

Challenges for a quantum theory of the universe
Speaker(s): Andreas Albrecht
Abstract: I review three challenges faced by attempts to develop a quantum theory of the universe and examine possible relationships between them. 1) The clock ambiguity: The choice of time parameter leads to profound ambiguities. 2) The choice of state: I contrast the de Sitter equilibrium picture with etern... read more
Date: 18/07/2009 - 2:30 pm

What will future dark energy experiments tell us?
Speaker(s): Andreas Albrecht
Abstract:
Date: 23/10/2008 - 11:30 am

The Clock Ambiguity and the Emergence of Physical Laws
Speaker(s): Andreas Albrecht
Abstract: The “clock ambiguity” is a general feature of standard formulations of quantum gravity, as well as a much wider class of theoretical frameworks. The clock ambiguity completely undermines any attempt at uniquely specifying laws of physics at the fundamental level. In this talk I explain in simple... read more
Date: 22/10/2008 - 2:00 pm
Series: Colloquium

The Clock Ambiguity and its Implications
Speaker(s): Andreas Albrecht
Abstract:
Date: 04/09/2008 - 10:30 am
Valid XHTML 1.0!