[Triumf-seminars] TRIUMF Colloquium today at 14:00
TRIUMF Seminars
triumf-seminars at lists.triumf.ca
Thu Oct 31 05:00:00 PDT 2019
Date/Time: Thu 2019-10-31 at 14:00
Location: Auditorium
Speaker: Levon Pogosian (SFU)
Title: The Accelerating Universe: Lambda, W, and Beyond
Abstract: While cosmic acceleration is well-established, the nature of Dark Energy causing it remains unknown. A flat universe dominated by a cosmological constant (Lambda) and cold dark matter (CDM) has been cosmologists' working model of choice for nearly two decades. However, the value of Lambda poses a serious theoretical challenge, exposing a gap in our understanding of the vacuum energy and the way it gravitates. Intriguingly, there appear to be tensions between different datasets within the LCDM framework that would be relieved if Dark Energy density was non-constant. I will discuss the evidence for this, as well as some of the alternatives to Lambda and ways of testing them with future data.
Costumes and candy are both very welcome!
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