Month: September 2022

“THE INNER STRUCTURES of quasars (the accretion disk, the BLR, and the dust torus) are all within the sphere of influence of the SMBH, where the most important processes associated with accretion are occurring (e.g., winds and outflows, photoionization, chemical enrichment, dynamical evolution, etc.).” ( SMBH = supermassive black hole; BLR = broad emission line region). https://lnkd.in/dEvc7DF View in LinkedIn

QUASARS. “Given the compact sizes of these inner regions (sub-parsec for a 108 M⊙ BH), variability induced by instabilities in the accretion flow, reprocessing of light, and dynamical evolution of the inner regions can be observed over a broad range of timescales from intra-hours to decades, providing observational constraints on these regions that are too small to be spatially resolved directly.” (M⊙ = unit of sun’s mass). https://lnkd.in/dEvc7DF View in LinkedIn

KARL R POPPER. “It is not my intention to raise any “what is” questions, such as “What is mind?” or “What is matter?”. (In fact the need to avoid “what is” questions will turn out to be one of my major points). It is still less of my intention to answer such questions. (That is, I am not offering what is sometimes called an “ontology”.) https://lnkd.in/dbkcDjD View in LinkedIn

Ancient arches in limestone on small round church in Girona. View in LinkedIn

“VARIABILITY is a hallmark characteristic of quasars. Nearly all quasars vary across the entire electromagnetic spectrum, with the variability amplitude depending on timescale, wavelength, and accretion parameters (e.g., BH mass and accretion rate). This ubiquitous variability encodes critical information about the structure and dynamics of the emitting regions, as well as detailed underlying physics of accretion and feedback processes in these active SMBHs.” (SMBH = super massive black holes; BH = black hole). https://lnkd.in/dEvc7DF View in LinkedIn

THE END. “White holes as remnants: a surprising scenario for the end of a black hole.” https://lnkd.in/dqZGa_3 View in LinkedIn

INFORMATION PARADOX SOLUTION. “Quantum tunneling of a black hole into a white hole provides a model for the full life cycle of a black hole. The white hole acts as a long-lived remnant, providing a possible resolution to the information paradox.” https://lnkd.in/dqZGa_3 View in LinkedIn

QUANTUM TUNNELS. “We point out that (i) established physics includes objects with precisely the required properties for remnants: white holes with small masses but large finite interiors; (ii) non-perturbative quantum gravity indicates that a black hole tunnels precisely into such a white hole, at the end of its evaporation.” https://lnkd.in/dqZGa_3 View in LinkedIn

NO VIOLATION. “We address the objections to the existence of white-hole remnants, discuss their stability, and show how the notions of entropy relevant in this context allow them to evade several no-go arguments. A black hole's formation, evaporation, tunneling to a white hole, and final slow decay, form a unitary process that does not violate any known physics.” https://lnkd.in/dqZGa_3 View in LinkedIn

GIANT COSMIC LAB. “On White Holes as Particle Accelerator. We analyze scenarios of particle collisions in the metric of a nonextremal black hole that can potentially lead to an ultrahigh energy Ec.m. in their center-of-mass frame.” https://lnkd.in/d6_hYsy View in LinkedIn