↑Jacob Bekenstein, Black Hole Pioneer and Hebrew University Physicist, Has Died ↑ Jennifer Ouellette, « In Memoriam: Jacob Bekenstein (1947-2015) and Black Hole Entropy », sur blogs.scientificamerican.com, 17 août 2015 Jacob David Bekenstein (Hebrew: יעקב בקנשטיין; May 1, 1947 – August 16, 2015) was an Israeli-American theoretical physicist who made fundamental contributions to the foundation of black hole thermodynamics and to other aspects of the connections between information and gravitation. Jacob Bekenstein, a physicist who prevailed in an argument with Stephen Hawking that revolutionized the study of black holes, and indeed the nature of … Entropy is a measure of the energy unavailable to do work. Jacob David Bekenstein was born in Mexico City on May 1, 1947. While this law may hold good for a system including a black hole, it is not informative in its original form. And \(\Phi_{BH}\) turns out to be black hole's electric potential in the sense that it equals the line integral of the hole's electric field from infinity to any location on the horizon. Jacob David Bekenstein (Hebrew: יעקב בקנשטיין; May 1, 1947 – August 16, 2015) was an Israeli-American theoretical physicist who made fundamental contributions to the foundation of black hole thermodynamics and to other aspects of the connections between information and gravitation. Browse All Figures Return to Figure Change zoom level Zoom in Zoom out. ‎Jacob Bekenstein, an Israeli physicist of the Hebrew University, Jerusalem, planted the seeds of a revolution of our understanding of space-time. : Physical Review D, 7, 2333, (1973), Bekenstein J.D. The AdS/CFT correspondence is a mapping between gravitational degrees of freedom of a certain spacetime and the matter (or field) degrees of freedom residing on its boundary. ↑ Jacob Bekenstein, Black Hole Pioneer and Hebrew University Physicist, Has Died \], \[\tag{11} \[\tag{2} Witten (1998) has shown that the entropy of a black hole residing in the bulk (GM/c^2)^2-(G^{1/2}Q^2/c^2)^2-(J/Mc)^2=0. Black hole entropy counts the number of horizon gravitational states. Metrics. Sign up to receive regular email alerts from Physical Review D. ISSN 2470-0029 (online), 2470-0010 (print). Those ideas eventually evolved into a proposal for a bound on the entropy-to-energy ratio of matter confined to a region of given size. Jacob Bekenstein : biography 01 May 1947 – Jacob David Bekenstein (Hebrew: יעקב בקנשטיין) (born May 1, 1947) is an Israeli theoretical physicist who has contributed to the foundation of black hole thermodynamics and to other aspects of the connections between information and gravitation. T dS = dE -dW\]. After a brief review of the elements of the theory of information, we discuss black-hole physics from the point of view of information theory. \]. \], Consequently the horizon area is given by Is this possible at all ?There are several ways to justify the concept of black hole entropy (Bekenstein 1972, 1973). For any specific choice of these parameters one can imagine many scenarios for the black hole's formation. Is it meaningful or desirable to associate entropy with it ? Note that a one-solar mass Schwarzschild black hole has an horizon area of the same order as the municipal area of Atlanta or Chicago. In ordinary statistical mechanics, the entropy \(S\) is a measure of the multiplicity of microstates that hide behind one particular macrostate. QUANTUM BLACK HOLES AS ATOMS JACOB D. BEKENSTEIN Racah Institute of Physics, The Hebrew University of Jerusalem Givat Ram, Jerusalem, 91904 ISRAEL In some respects the black hole plays the same role in gravitation that the atom played in the nascent quantum mechanics. The APS Physics logo and Physics logo are trademarks of the American Physical Society. Zwiebach 2004). In this paper we make this similarity the basis of a thermodynamic approach to black-hole physics. Use of the American Physical Society websites and journals implies that May 1, 1947, Mexico city) is the Micheal Polak Professor of Theoretical Physics at the Hebrew University of Jerusalem, Israel. \], \(\tag{9} COVID-19 has impacted many institutions and organizations around the world, disrupting the progress of research. Therefore, a string has entropy, which turns out to be proportional to its mass. \Theta\, dA = d(Mc^2) -\Omega_{BH}\, dJ - \Phi_{BH}\, dQ\], \[\tag{8} And we hope you, and your loved ones, are staying safe and healthy. \Phi_{BH}\equiv Qr_h\Big(r_h^2+(J/Mc)^2\Big)^{-1}. \[\tag{3} This is known to reflect a failure of the energy condition (assumed by the theorem) as a result of the very quantum fluctuations which engender the radiation. Jacob D. Bekenstein; There are a number of similarities between black-hole physics and thermodynamics. Black hole entropy is a concept with geometric root but with many physical consequences. 2, 58-65 (2003). There are a number of similarities between black-hole physics and thermodynamics. Grav. \[\tag{1} It ties together notions from gravitation, thermodynamics and quantum theory, and is thus regarded as a window into the as yet mostly hidden world of quantum gravity. The honor recognized his groundbreaking work on black hole entropy and the pathways it opened to understanding of the cosmos. He was hoping to disprove the contention of Jacob Bekenstein, then a graduate student at Princeton and now a professor at the Hebrew University in Jerusalem, that the area of a black hole’s boundary, the point of no return in space, was a measure of the entropy of a black hole. There are a number of similarities between black-hole physics and thermodynamics. Using conservative intuitive methods including time-old gedanken experiments, he discovered that black holes have thermodynamical properties such as entro… \), Institut de Physique Théorique, CEA & CNRS, Gif-sur-Yvette, France, Editor-in-Chief of Scholarpedia, the peer-reviewed open-access encyclopedia, Centro Atomico Bariloche, 8400-S.C. de Bariloche, Rio Negro, Argentina, http://www.scholarpedia.org/w/index.php?title=Bekenstein-Hawking_entropy&oldid=182595, Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. I had a look at Jacob Bekenstein's 1973 Physical Review D paper "Black holes and entropy" for the answer to my question about Susskind's presentation of the Bekenstein derivation of the formula stating that black hole entropy is proportional to horizon area. An example of this approach is a calculation by Carlip (1999) based on the group of symmetries at the horizon. With a black hole thermodynamics R. M. 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