Month: September 2022

GRAVITY-CENTRIC. “Structures (galaxies, galaxy clusters) form via gravitational instability: small initial over-densities grow due to gravity. How the perturbations grow, and hence how galaxies cluster, depends on the contents of the Universe.” https://lnkd.in/e6ifiQMn View in LinkedIn

DARK MATTER. “The nature of DM affects the evolution of the density perturbations. Cold dark matter (CDM) decouples when non-relativistic, and has very small velocity dispersion today. Hot dark matter (HDM) decouples when relativistic and has non-zero velocity dispersion today.” Thus dark matter is closely interconnected to gravity. https://lnkd.in/e6ifiQMn View in LinkedIn

COSMIC STRUCTURES. “Perturbations on scales smaller than galaxy clusters are erased, and structure formation is ‘top down’: large objects form first.” https://lnkd.in/e6ifiQMn View in LinkedIn

WIMP: weakly interacting massive particle (WIMP), heavy, electromagnetically neutral subatomic particle that is hypothesized to make up most dark matter and therefore some 22 percent of the universe.” https://lnkd.in/eEwV_wZp View in LinkedIn

WIMP HALOS. “The first WIMP halos to form are roughly Earth mass microhalos.” (WIMP = weakly interacting massive particle). https://lnkd.in/e6ifiQMn View in LinkedIn

DARK MATTER HALOS. “The spherical collapse model for the formation of individual DM halos.” (DM = dark matter). https://lnkd.in/e6ifiQMn View in LinkedIn

BENT LIGHT. “Gravitational lensing occurs when matter deflects/bends the path of light as it travels from a source to the observer.” https://lnkd.in/e6ifiQMn View in LinkedIn

THE NATURE OF REALITY. “The totality of perception, including every memory, is notoriously unreliable and misleading. How then, should one try to comprehend the fundamental nature of consciousness? Moreover, is the external world our senses are seemingly reporting to us about really “out there?” https://link.springer.com/chapter/10.1007/978-3-030-03633-1_14 View in LinkedIn

The two spiral arms winding towards the bright centre might deceive you into thinking you are looking at a galaxy a bit like our Milky Way. But the object starring in this image is of a different nature: PK 329-02.2 is a ‘planetary nebula’ within our home galaxy. https://lnkd.in/ehBKkbqy View in LinkedIn

NEW. My new virtual sculpture gallery. Nigelfleming.com http://Nigelfleming.com View in LinkedIn