Month: September 2022

The waxy magnolia comes forh in the growing summer heat, flawless in the growing energy and commotion. View in LinkedIn

DOWNSIZING EXPLANATION. “With these three modifications, the models can explain the observed downsizing, successfully reproduce the bolometric AGN luminosity function and simultaneously reproduce galaxy and BH properties in the local Universe.” (BH = black hole; AGN = active galactic nuclei). https://lnkd.in/d9JV8md View in LinkedIn

EXPLAINING THE HEAVENS. “Our best-fitting model suggests a scenario in which disc instabilities are the main driver for moderately luminous Seyfert galaxies at low redshift, while major mergers are the main trigger for luminous AGN.” (AGN = active galactic nuclei). https://lnkd.in/d9JV8md View in LinkedIn

THE CURVE. “It has been known since early optical quasar surveys that the comoving number density of luminous quasars has a pronounced peak at a redshift around z = 2–2.5, with a fairly steep decline at higher and lower redshift.” https://lnkd.in/d9JV8md View in LinkedIn

RARE BLACK HOLES. “More recently, it was discovered that very massive black holes (BH; 10(9) M⊙) appears to exist already at z ∼ 6 and higher, but they are extremely rare, in accordance with this trend.” (BH = black hole; z = redshift). https://lnkd.in/d9JV8md View in LinkedIn

CORRELATIONS. “All of these studies in the hard and soft X-ray range find that the cosmic evolution of AGN is strongly dependent on the AGN luminosity: the number density of successively less luminous AGN peaks at lower redshifts, with the lowest luminosity AGN showing a basically constant number density.” (AGN = active galactic nuclei). https://lnkd.in/d9JV8md View in LinkedIn

An extraordinarily flavorful and supremely ripe French cheese being prevented from galloping off the table. View in LinkedIn

FRAGMENT FROM NATURE features for this and next weekend an excellent article by media ecologist and MIT-educated physicist Robert K. Logan, on the relationship between mathematics and language. His very original hypothesis runs counter to traditional thinking on the topic, and suggests that they are very intimately related in unexpected ways. https://lnkd.in/dKUCtJu View in LinkedIn

COEVOLUTION OF LANGUAGE AND MATHS. “I will show in this essay that the origin of verbal language and mathematics depend on each other. We will explore the notion that mathematics is part of an evolutionary chain of six languages. One does not ordinarily think of computing and the Internet as languages but I will demonstrate that speech, writing, mathematics, science, computing and the Internet form an evolutionary chain of six languages.” https://lnkd.in/dq9dXxs View in LinkedIn