The Black Hole: An Imaginary Conversation with Albert Einstein

1979 ◽  
pp. 51-56
Author(s):  
John A. Wheeler
Keyword(s):  
Black Hole ◽  
Albert Einstein

scholarly journals A Brief Observational History of the Black-Hole Spacetimes

2015 ◽  
Vol 2015 ◽  
pp. 1-4 ◽  
Author(s):  
Wolfgang Kundt
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Vacuum Solution ◽  
Albert Einstein ◽  
Spherically Symmetric ◽  
100Th Birthday ◽  
Black Hole Spacetimes ◽  
History Of ◽  
Symmetric Vacuum

In this year (2015), black holes (BHs) celebrate their 100th birthday, if their birth is taken to be triggered by a handwritten letter from Martin Schwarzschild to Albert Einstein, in connection with his newly found spherically symmetric vacuum solution.

scholarly journals What are Gravitational waves?

2016 ◽  
Vol 4 (1) ◽  
Author(s):  
Bhanu Pratap Singh
Keyword(s):  
Black Hole ◽  
General Theory ◽  
Gravitational Waves ◽  
Albert Einstein ◽  
Mathematical Physics ◽  
Theory Of Relativity ◽  
General Theory Of Relativity ◽  
General Reader ◽  
History Of ◽  
The Universe

The purpose of this article is not to present a popular history of mathematical physics nor even to display for the general reader some of the result of research in the history of science, Rather the intention is to explore one important aspect of the great scientific revaluation of recent times which proves the existence of Gravitational wave, predicted by Dr. Albert Einstein about a hundred years ago in his general theory of relativity. Gravitational waves are ripples in the fabric of space time caused by some of the most violent and energetic processes in the universe. They are produced by catastrophic events such as colliding Black hole as well as the collapse of stellar super nova.

1. What is a black hole?

2015 ◽  
Author(s):  
Katherine Blundell
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Event Horizon ◽  
Albert Einstein ◽  
Escape Velocity ◽  
The Universe

A black hole is a region of space where the force of gravity is so strong that nothing, not even light, can travel fast enough to escape from its interior. ‘What is a black hole?’ outlines how they were first conceived by theoretical physicists such as John Michell, Henry Cavendish, Pierre-Simon Laplace, and Albert Einstein, and explains the concepts of singularity, escape velocity, the event horizon, and spacetime. Black holes have now been identified in the Universe in their hundreds and accounted for in their millions. Although invisible, these objects interact with and influence their surroundings in different ways depending on proximity relative to the black hole.

scholarly journals Binary Black Hole Automated Identification by Agglomerative Clustering based on Gravitational Waves

2021 ◽  
Vol 2089 (1) ◽  
pp. 012027
Author(s):  
Subhrangshu Adhikary ◽  
Saikat Banerjee
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Gravitational Wave ◽  
Gravitational Waves ◽  
Learning Algorithm ◽  
Albert Einstein ◽  
Data Availability ◽  
Theory Of Relativity ◽  
Agglomerative Clustering ◽  
Binary Black Hole

Abstract The General Theory of Relativity, proposed by Albert Einstein theoretically predicted that very large accelerating mass creates ripples in spacetime which is the strongest for merging binary black hole system and the ripples can travel billions of light-years and these ripples are called Gravitational Waves. By the time these waves reach Earth, they become very faint and can’t be detected with regular methods. For this, LIGO has created specialized detectors based on the laser interference principle to detect strains caused by gravitational waves in e-19 scale. GW190521 is a gravitational wave event recorded on 21 May 2019 at 03:02:29 UTC and caused by the merger of two black holes of 85M© and 66 M© whose progenitor was the largest ever recorded. Throughout literature, very few amounts of autonomous black hole identification models have been made because of limited data availability. This experiment proposes methods for autonomous identification of black holes by using an unsupervised machine learning algorithm called Agglomerative Clustering with very little data to train which can adapt quickly to gravitational wave events. The model could be easily deployed near laser interferometric observatories for autonomous black hole identification with minimal effort.

Aneurysms in the history of medicine

VASA ◽  
2002 ◽  
Vol 31 (4) ◽  
pp. 281-286 ◽  
Author(s):  
Bollinger ◽  
Rüttimann
Keyword(s):  
History Of Medicine ◽  
Albert Einstein ◽  
Thomas Mann ◽  
Post Mortem ◽  
John Hunter ◽  
History Of

Die Geschichte des sackförmigen oder fusiformen Aneurysmas reicht in die Zeit der alten Ägypter, Byzantiner und Griechen zurück. Vesal 1557 und Harvey 1628 führten den Begriff in die moderne Medizin ein, indem sie bei je einem Patienten einen pulsierenden Tumor intra vitam feststellten und post mortem verifizierten. Weitere Eckpfeiler bildeten die Monographien von Lancisi und Scarpa im 18. bzw. beginnenden 19. Jahrhundert. Die erste wirksame Therapie bestand in der Kompression des Aneurysmasacks von außen, die zweite in der Arterienligatur, der John Hunter 1785 zum Durchbruch verhalf. Endoaneurysmoraphie (Matas) und Umhüllung mit Folien wurden breit angewendet, bevor Ultraschalldiagnostik und Bypass-Chirurgie Routineverfahren wurden und die Prognose dramatisch verbesserten. Die diagnostischen und therapeutischen Probleme in der Mitte des 20. Jahrhunderts werden anhand von zwei prominenten Patienten dargestellt, Albert Einstein und Thomas Mann, die beide im Jahr 1955 an einer Aneurysmaruptur verstarben.

The first-ever image of a black hole is now a movie

Nature ◽  
2020 ◽  
Vol 586 (7827) ◽  
pp. 18-19
Author(s):  
Davide Castelvecchi
Keyword(s):  
Black Hole
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