Interpretations of cosmic expansion: anchoring conceptions and misconceptions
arXiv:2008.07776 · doi:10.1088/1361-6552/aba3b1
Abstract
Teaching cosmology at the undergraduate or high school level requires simplifications and analogies, and inevitably brings the teacher into contact with at least one of the pedagogical interpretations of the expanding universe. The by far most popular interpretation holds that galaxies in an expanding universe are stationary, while space itself expands and thus causes the growing distances that characterize cosmic expansion. The alternative relativistic explosion interpretation regards cosmic expansion as a pattern of (relativistic) galaxy motion. The aim of this article is to discuss the two competing interpretations from the perspective of potential student preconceptions, taking into account both beneficial anchoring conceptions and potentially harmful preconceptions that can lead to misconceptions.
arXiv comment10 pages, 3 figures
References in corpus (12)
- Expanding Confusion: common misconceptions of cosmological horizons and the superluminal expansion of the Universe
- The influence of the cosmological expansion on local systems
- The kinematic origin of the cosmological redshift
- Joining the Hubble Flow: Implications for Expanding Space
- Expanding Space: the Root of all Evil?
- Lightlike simultaneity, comoving observers and distances in general relativity
- Does cosmological expansion affect local physics?
- Hubble's law and faster than light expansion speeds
- Cosmic inflation and big bang interpreted as explosions
- Relatively complicated? Using models to teach general relativity at different levels
- Velocities of distant objects in General Relativity revisited
- Cosmic event horizons and the light-speed limit for relative radial motion