arXiv subjects

Markus Pössel

Publications and source records attributed to Markus Pössel.

21 records · Page 2Linked to original sources

arXiv2017

Street lights as standard candles: A student activity for understanding astronomical distance measurements

Astronomers measure cosmic distances to objects beyond our own galaxy using standard candles: objects of known intrinsic brightness, whose apparent brightnesses in the sky are then taken as an indication of their distances from the observer. In this activity, we use street lights and a digital camera to explore the method of standard candles as well as some of its limitations and possible sources of error.

physics.ed-ph↗

arXiv2003

Chronological structure of a Goedel type universe with negative cosmological constant

We show that the Goedel solution of five-dimensional gauged supergravity contains either closed time-like curves through every space-time point or none at all, dependent on the rotational parameter. In addition, we present a deformation of that solution with a parameter kappa which characterizes the symmetry of four-dimensional base space: for kappa = 1, 0, -1 it has spherical, flat and hyperbolic symmetry, respectively. Also investigated are the causal properties of the lifted solution in 10 dimensions.

hep-th↗

arXiv2003

Hidden symmetries in minimal five-dimensional supergravity

We study the hidden symmetries arising in the dimensional reduction of d=5, N=2 supergravity to three dimensions. Extending previous partial results for the bosonic part, we give a derivation that includes fermionic terms, shedding light on the appearance of the local hidden symmetry SO(4) in the reduction.

hep-th↗