A lecture from the CERN website by Carlo Rovelli (who initially introduced the theory of loop quantum gravity in 1988). Date- 21.08.2008. Source- http://cdsweb.cern.ch/record/1121957?ln=en slides- http://indico.cern.ch/getFile.py/access?contribId=30&resId=0&materialId=slides&confId=21917 From wiki- 'Loop quantum gravity (LQG), also known as loop gravity and quantum geometry, is a proposed quantum theory of spacetime which attempts to reconcile the theories of quantum mechanics and general relativity. It preserves many of the important features of general relativity, while at the same time employing quantization of both space and time at the Planck scale in the tradition of quantum mechanics. The technique of loop quantization was developed for the nonperturbative quantization of diffeomorphism-invariant gauge theory. Roughly, LQG tries to establish a quantum theory of gravity in which the very space, where all other physical phenomena occurs, becomes quantized.'
Loop
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Added: 823 days ago by
deek
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Clip 2 of a lecture from the CERN website by Carlo Rovelli (who initially introduced the theory of loop quantum gravity in 1988). Date- 21.08.2008. Source- http://cdsweb.cern.ch/record/1121957?ln=en slides- http://indico.cern.ch/getFile.py/access?contribId=30&resId=0&materialId=slides&confId=21917 From wiki- 'Loop quantum gravity (LQG), also known as loop gravity and quantum geometry, is a proposed quantum theory of spacetime which attempts to reconcile the theories of quantum mechanics and general relativity. It preserves many of the important features of general relativity, while at the same time employing quantization of both space and time at the Planck scale in the tradition of quantum mechanics. The technique of loop quantization was developed for the nonperturbative quantization of diffeomorphism-invariant gauge theory. Roughly, LQG tries to establish a quantum theory of gravity in which the very space, where all other physical phenomena occurs, becomes quantized.'
Loop
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LQG
carlo
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Added: 823 days ago by
deek
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Clip 3 of a lecture from the CERN website by Carlo Rovelli (who initially introduced the theory of loop quantum gravity in 1988). Date- 21.08.2008. Source- http://cdsweb.cern.ch/record/1121957?ln=en slides- http://indico.cern.ch/getFile.py/access?contribId=30&resId=0&materialId=slides&confId=21917 From wiki- 'Loop quantum gravity (LQG), also known as loop gravity and quantum geometry, is a proposed quantum theory of spacetime which attempts to reconcile the theories of quantum mechanics and general relativity. It preserves many of the important features of general relativity, while at the same time employing quantization of both space and time at the Planck scale in the tradition of quantum mechanics. The technique of loop quantization was developed for the nonperturbative quantization of diffeomorphism-invariant gauge theory. Roughly, LQG tries to establish a quantum theory of gravity in which the very space, where all other physical phenomena occurs, becomes quantized.'
Loop
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carlo
rovelli
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Added: 823 days ago by
deek
Runtime: 09:15 |
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Towards a Spin Foam Model of Quantum Gravity
NOTE: pdf link for transparencies- http://math.ucr.edu/home/baez/loops05/loops05.pdf Probably not everyones cup of tea. A clip from a lecture by John Baez in conjunction with the LOOPS 'O5 series by the Max Planck Institute of Gravitation (Albert Einstein Institute) regarding a proposal for quantum gravity (the clip appears to start at page 14 of the transparencies). Date- 11th Oct 05. Source- http://math.ucr.edu/home/baez/loops05/ LOOPS '05- http://loops05.aei.mpg.de/ 'Spin foam models include several different classes of physical theories: lattice gauge theories, dynamical triangulation models of quantum gravity, "chain mail" quantum field theories, and topological string theories. Is there a spin foam model of quantum gravity in 4 dimensions? To address this question, we review recent work on causal dynamical triangulations and the renormalization group. This suggests that quantum gravity is a well-defined theory with the curious property that spacetime is effectively 4-dimensional at large distance scales, but 2-dimensional at very short distance scales. This is just what one might expect from a spin foam model, since spacetime is fundamentally 2-dimensional in these theories. We discuss properties a spin foam model should have in order to approximate general relativity at large distance scales.'
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Added: 823 days ago by
deek
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UC Berkeley's Raphael Bousso presents a friendly introduction to the ideas behind the holographic principle, which may be very important in the hunt for a theory of quantum gravity. Series: "Lawrence Berkeley National Laboratory Summer Lecture Series" [3/2006] [Science] [Show ID: 11140]
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Added: 823 days ago by
deek
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Einstein Gravity and the Expanding Universe
http://www.myspace.com/acorvettes Scientific understanding is always subject to change. Not long after Einstein proposed the cosmological constant, scientists observed that the universe was much bigger than previously thought; the astronomer Edwin Hubble concluded it was, in fact, expanding. Faced with this knowledge, Einstein renounced his own idea, calling it his "biggest blunder." Though Hubble's new findings were widely accepted, scientists now faced new questions: If the universe was so big and continuously expanding, what was driving expansion? And shouldn't the force of gravity at least be slowing it down?
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Added: 826 days ago by
deek
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The Library Of Alexandria - Best Of Carl Sagan's Cosmos (7)
The Library Of Alexandria - Best Of Carl Sagan's Cosmos (Part 7). --- Subscribe to Science & Reason: • http://www.youtube.com/Best0fScience • http://www.youtube.com/SagansCosmos • http://www.youtube.com/FFreeThinker --- BEST OF CARL SAGAN'S "COSMOS": 1) 10 Years After: Carl Sagan & Ann Druyan Reflect: http://www.youtube.com/watch?v=leTNfwfH0Jc 2) Lost Between Immensity And Eternity: http://www.youtube.com/watch?v=vIVsDg6U0LU 3) The Realm Of The Galaxies: http://www.youtube.com/watch?v=1axoV6HhWfI 4) Our Galaxy, The Milky Way: http://www.youtube.com/watch?v=eOazBTHzRYA 5) Our Solar System: http://www.youtube.com/watch?v=iBqjob-UVeo 6) Eratosthenes And The Round Earth Model: http://www.youtube.com/watch?v=en5UKtcNujI 7) The Library Of Alexandria: http://www.youtube.com/watch?v=vVQs4B2jAW0 8) A Short History Of The Universe: http://www.youtube.com/watch?v=7n2r0qOxJ6k 9) Artificial And Natural Selection: http://www.youtube.com/watch?v=i3uToVWZkWM 10) The Cosmic Year: http://www.youtube.com/watch?v=yFqbm_94nTM 11) Tree Of Life - 4 Billion Years Of Evolution: http://www.youtube.com/watch?v=KF0UECN4ndA 12) The Miracle Of Life: http://www.youtube.com/watch?v=TOyojWeOYNA 13) DNA - The Common Basis Of Life: http://www.youtube.com/watch?v=ecmuvjSykf8 14) Abiogenesis The Origin Of Life: http://www.youtube.com/watch?v=yet1xkAv_HY 15) Astronomy vs Astrology: http://www.youtube.com/watch?v=ImaQS9NJ0nI 16) Pictures In The Sky: http://www.youtube.com/watch?v=iwCAwc4bge4 17) Ancient Astronomy: http://www.youtube.com/watch?v=H-5dwJwau1Y 18) Triumph Of Modern Science Over Medieval Superstition: http://www.youtube.com/watch?v=8lfmRqT-B_c 19) The Mysterious Tonguska Event: http://www.youtube.com/watch?v=irVof7adq4s --- Carl Edward Sagan, Ph.D. (1934-1996) was an American astronomer, astrochemist, author, and highly successful popularizer of astronomy, astrophysics and other natural sciences. He pioneered exobiology and promoted the Search for Extra-Terrestrial Intelligence (SETI). He is world-famous for writing popular science books and for co-writing and presenting the award-winning 1980 television series "Cosmos: A Personal Voyage", which has been seen by more than 600 million people in over 60 countries, making it the most widely watched PBS program in history. A book to accompany the program was also published. He also wrote the novel "Contact", the basis for the 1997 Robert Zemecki's film of the same name starring Jodie Foster. During his lifetime, Sagan published more than 600 scientific papers and popular articles and was author, co-author, or editor of more than 20 books. In his works, he frequently advocated skeptical inquiry, secular humanism, and the scientific method. http://www.carlsagan.com .
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Added: 827 days ago by
deek
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Ancient Astronomy - Best Of Carl Sagan's Cosmos (17)
Ancient Astronomy - Best Of Carl Sagan's Cosmos (Part 17) --- Subscribe to Science & Reason: • http://www.youtube.com/Best0fScience • http://www.youtube.com/SagansCosmos • http://www.youtube.com/FFreeThinker --- BEST OF CARL SAGAN'S "COSMOS": 1) 10 Years After: Carl Sagan & Ann Druyan Reflect: http://www.youtube.com/watch?v=leTNfwfH0Jc 2) Lost Between Immensity And Eternity: http://www.youtube.com/watch?v=vIVsDg6U0LU 3) The Realm Of The Galaxies: http://www.youtube.com/watch?v=1axoV6HhWfI 4) Our Galaxy, The Milky Way: http://www.youtube.com/watch?v=eOazBTHzRYA 5) Our Solar System: http://www.youtube.com/watch?v=iBqjob-UVeo 6) Eratosthenes And The Round Earth Model: http://www.youtube.com/watch?v=en5UKtcNujI 7) The Library Of Alexandria: http://www.youtube.com/watch?v=vVQs4B2jAW0 8) A Short History Of The Universe: http://www.youtube.com/watch?v=7n2r0qOxJ6k 9) Artificial And Natural Selection: http://www.youtube.com/watch?v=i3uToVWZkWM 10) The Cosmic Year: http://www.youtube.com/watch?v=yFqbm_94nTM 11) Tree Of Life - 4 Billion Years Of Evolution: http://www.youtube.com/watch?v=KF0UECN4ndA 12) The Miracle Of Life: http://www.youtube.com/watch?v=TOyojWeOYNA 13) DNA - The Common Basis Of Life: http://www.youtube.com/watch?v=ecmuvjSykf8 14) Abiogenesis The Origin Of Life: http://www.youtube.com/watch?v=yet1xkAv_HY 15) Astronomy vs Astrology: http://www.youtube.com/watch?v=ImaQS9NJ0nI 16) Pictures In The Sky: http://www.youtube.com/watch?v=iwCAwc4bge4 17) Ancient Astronomy: http://www.youtube.com/watch?v=H-5dwJwau1Y 18) Triumph Of Modern Science Over Medieval Superstition: http://www.youtube.com/watch?v=8lfmRqT-B_c 19) The Mysterious Tonguska Event: http://www.youtube.com/watch?v=irVof7adq4s --- Carl Edward Sagan, Ph.D. (1934-1996) was an American astronomer, astrochemist, author, and highly successful popularizer of astronomy, astrophysics and other natural sciences. He pioneered exobiology and promoted the Search for Extra-Terrestrial Intelligence (SETI). He is world-famous for writing popular science books and for co-writing and presenting the award-winning 1980 television series "Cosmos: A Personal Voyage", which has been seen by more than 600 million people in over 60 countries, making it the most widely watched PBS program in history. A book to accompany the program was also published. He also wrote the novel "Contact", the basis for the 1997 Robert Zemecki's film of the same name starring Jodie Foster. During his lifetime, Sagan published more than 600 scientific papers and popular articles and was author, co-author, or editor of more than 20 books. In his works, he frequently advocated skeptical inquiry, secular humanism, and the scientific method. http://www.carlsagan.com .
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Added: 827 days ago by
deek
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Triumph Of Modern Science Over Medieval Superstition
Johannes Kepler And The Triumph Of Modern Science Over Medieval Superstition - Best Of Carl Sagan's Cosmos (Part 18). Subscribe to Science & Reason: • http://www.youtube.com/SagansCosmos • http://www.youtube.com/Best0fScience • http://www.youtube.com/FFreeThinker BEST OF CARL SAGAN'S "COSMOS": 1) 10 Years After: Carl Sagan & Ann Druyan Reflect: http://www.youtube.com/watch?v=leTNfwfH0Jc 2) Lost Between Immensity And Eternity: http://www.youtube.com/watch?v=vIVsDg6U0LU 3) The Realm Of The Galaxies: http://www.youtube.com/watch?v=1axoV6HhWfI 4) Our Galaxy, The Milky Way: http://www.youtube.com/watch?v=eOazBTHzRYA 5) Our Solar System: http://www.youtube.com/watch?v=iBqjob-UVeo 6) Eratosthenes And The Round Earth Model: http://www.youtube.com/watch?v=en5UKtcNujI 7) The Library Of Alexandria: http://www.youtube.com/watch?v=vVQs4B2jAW0 8) A Short History Of The Universe: http://www.youtube.com/watch?v=7n2r0qOxJ6k 9) Artificial And Natural Selection: http://www.youtube.com/watch?v=i3uToVWZkWM 10) The Cosmic Year: http://www.youtube.com/watch?v=yFqbm_94nTM 11) Tree Of Life - 4 Billion Years Of Evolution: http://www.youtube.com/watch?v=KF0UECN4ndA 12) The Miracle Of Life: http://www.youtube.com/watch?v=TOyojWeOYNA 13) DNA - The Common Basis Of Life: http://www.youtube.com/watch?v=ecmuvjSykf8 14) Abiogenesis The Origin Of Life: http://www.youtube.com/watch?v=yet1xkAv_HY 15) Astronomy vs Astrology: http://www.youtube.com/watch?v=ImaQS9NJ0nI 16) Pictures In The Sky: http://www.youtube.com/watch?v=iwCAwc4bge4 17) Ancient Astronomy: http://www.youtube.com/watch?v=H-5dwJwau1Y 18) Triumph Of Modern Science Over Medieval Superstition: http://www.youtube.com/watch?v=8lfmRqT-B_c 19) The Mysterious Tonguska Event: coming soon Carl Edward Sagan, Ph.D. (1934-1996) was an American astronomer, astrochemist, author, and highly successful popularizer of astronomy, astrophysics and other natural sciences. He pioneered exobiology and promoted the Search for Extra-Terrestrial Intelligence (SETI). He is world-famous for writing popular science books and for co-writing and presenting the award-winning 1980 television series "Cosmos: A Personal Voyage", which has been seen by more than 600 million people in over 60 countries, making it the most widely watched PBS program in history. A book to accompany the program was also published. He also wrote the novel "Contact", the basis for the 1997 Robert Zemecki's film of the same name starring Jodie Foster. During his lifetime, Sagan published more than 600 scientific papers and popular articles and was author, co-author, or editor of more than 20 books. In his works, he frequently advocated skeptical inquiry, secular humanism, and the scientific method. • http://www.carlsagan.com Johannes Kepler (1571-1630) was a German mathematician, astronomer and astrologer, and key figure in the 17th century scientific revolution. He is best known for his eponymous laws of planetary motion, codified by later astronomers based on his works "Astronomia nova", "Harmonices Mundi", and "Epitome of Copernican Astrononomy". They also provided one of the foundations for Isaac Newton's theory of universal gravitation. During his career, Kepler was a mathematics teacher at a seminary school in Graz, Austria, an assistant to astronomer Tycho Brahe, the court mathematician to Emperor Rudolf II, a mathematics teacher in Linz, Austria, and an adviser to General Wallenstein. He also did fundamental work in the field of optics, invented an improved version of the refracting telescope (the Keplerian Telescope), and helped to legitimize the telescopic discoveries of his contemporary Galileo Galilei. Kepler lived in an era when there was no clear distinction between astronomy and astrology, but there was a strong division between astronomy (a branch of mathematics within the liberal arts) and physics (a branch of natural philosophy). • http://en.wikipedia.org/wiki/Johannes_Kepler .
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Added: 827 days ago by
deek
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Professor Stephen Hawking Takes Zero-Gravity Flight
ZERO-G(TM) and its sponsors, Space Florida and The Sharper Image, flew world-renowned physicist and cosmologist Professor Stephen Hawking into weightlessness today, performing eight parabolas, out of the Shuttle Landing Facility at the Kennedy Space Center in Central Florida. It was the first time Professor Hawking, the world's leading expert on gravity, had a zero-gravity experience.
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Added: 827 days ago by
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Runtime: 01:07 |
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Stephen Hawking Takes a Zero-Gravity Flight
http://www.FreeScienceLectures.com ZERO-G(TM) and its sponsors, Space Florida and The Sharper Image, flew world-renowned physicist and cosmologist Professor Stephen Hawking into weightlessness today, performing eight parabolas, out of the Shuttle Landing Facility at the Kennedy Space Center in Central Florida. It was the first time Professor Hawking, the world's leading expert on gravity, had a zero-gravity experience. After the flight Stephen Hawking had to say the following: "The zero-g (0g) part was wonderful and the high-g part was no problem. I could had gone on and on. Space here I come!" --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. ---
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Added: 827 days ago by
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Runtime: 01:23 |
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Lec 22 801 Physics I Classical Mechanics Fall 1999
anyone else. But finally he arrived at two... three golden eggs. And the first golden egg then is that the orbits are ellipses-- he talked always about planets-- and the Sun is at one focus. That's Kepler's law number one. These are from around 1618 or so. The second... Kepler's second law is-- quite bizarre how he found that out, an amazing accomplishment. If you take an ellipse, and you put the Sun here at a focus-- this is highly exaggerated because I told you that most orbits look sort ...
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Added: 834 days ago by
adminn
Runtime: 49:08 |
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