Month: September 2022

The gyre spins on its heel as another season starts again. View in LinkedIn

BLACK HOLE EVOLUTION. “The cosmological evolution of primordial black holes (PBHs) is considered. A comprehensive view of the accretion and evaporation histories of PBHs across the entire cosmic history is presented, with focus on the critical mass holes.” https://lnkd.in/dggABMY View in LinkedIn

STAGGERING VIEW. “Across cosmic time such a black hole will not accrete radiation or matter in sufficient quantity to hasten the inevitable evaporation, if the black hole remains within an average volume of the universe.” https://lnkd.in/dggABMY View in LinkedIn

BLACK HOLE GROWTH. “A PBH located in an overdense region can undergo enhanced accretion leading to the possibility of growing by many orders of magnitude across cosmic history. The accretion rate onto PBHs is most sensitive to the mass of the hole, the sound speed in the cosmological fluid, and the energy density of the accreted components.” (PBHs = primordial black holes). https://lnkd.in/dggABMY View in LinkedIn

BLACK HOLE DEATH. “Low mass PBHs evaporate before the current epoch and the radiation signature of an isolated high mass PBH is too weak to detect. The last moments of a PBH evaporation reveal the hole through a burst of high-energy radiation that is distinguishable from that of short gamma-ray bursts (GRBs).” (PBHs = primordial black holes). https://lnkd.in/dggABMY View in LinkedIn

BLACK HOLE GHOSTS. “The upper limits on the number density of PBHs across a wide range of masses is discussed extensively in Carr et al. To date there are no confirmed PBH burst signals, but these compelling ghosts are ripe cosmological messengers that will enhance our understanding of the universe if observed.”(PBHs = primordial black holes). https://lnkd.in/dggABMY View in LinkedIn

BACK IN TIME. “The PBHs evolving through cosmic history could be used as a proxy for understanding the conditions in the early universe.” (PBHs = primordial black holes). https://lnkd.in/dggABMY View in LinkedIn

RECOLLECTION. " "“There are in our existence spots of time," "That with distinct pre-eminence retain" "A renovating virtue.”" "(Wordsworth, The Prelude, “key moments in the history of his imagination”.) https://lnkd.in/dmTmScZ View in LinkedIn

The expert stone wall builder at work, a dying craft of great skill. View in LinkedIn

FIRST visualization of black hole magnetic fields using polarized light. Exciting new data that sheds light onto the black hole. https://lnkd.in/g678gNA View in LinkedIn