AG - Schwerpunkt Astro- und Geophysik
Astronom. CCD Calibrations and Observations
Dark Matter Halos
Emission Line Spectroscopy
The Microwave Sky
Zeeman Spectroscopy of Stellar ...
Summer Term 2017 - Schwerpunkt
Astro- und Geophysik
The Curious Case of Dark Energy
The aim of this lab is to learn about some
key issues in modern cosmology, and understand
how we infer the contents of the Universe from
a combination of observations and theory.
In the last century, it was commonly believed
that the expansion rate of the Universe was slowing
down due to the presence of non-relativistic and
relativistic matter. The fact that the Universe was,
on the contrary, undergoing an accelerated expansion
was discovered in 1998 by using distant type Ia
supernovae as standard candles. The observation
drastically changed our understanding of our
Universe, its past, present and future, and we
attribute it to a new component called Dark Energy,
about which we know very little.
In this lab, we will use the original supernovae data
to measure quantitatively the acceleration. Besides
examining the data, we will investigate the theoretical
framework behind dark energy and the study the challenges
a small but non-zero cosmological constant poses to theorists.