Brian Greene
@bgreene
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Theoretical Physicist, Author, Co-founder @WorldSciFest , Professor of Mathematics & Physics, Columbia University
New York, NY
Joined May 2012
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"I am, somehow, less interested in the weight and convolutions of Einstein’s brain than in the near certainty that people of equal talent have lived and died in cotton fields and sweatshops."--Stephen Jay Gould, died OTD 2002.
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"The Earth is a very small stage in a vast cosmic arena. Think of the rivers of blood spilled by all those generals and emperors so that, in glory and triumph, they could become the momentary masters of a fraction of a dot." --Carl Sagan, born OTD 1934
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Just announced: First ever direct image of the black hole at the center of our Milky Way galaxy. Another triumph for the Event Horizon Telescope.
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Visualizations of Einstein's general relativity often show space warping only "underneath" an object--this visual is better:
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Einstein's discovery, ensconced mathematically OTD in 1915, is that matter warps the spacetime through which it moves, and that warping is what we perceive as gravity.
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General relativity's central feature of mass warping spacetime is often illustrated in 2d--here's a nice attempt to visualize it in 3d.
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The observable universe is 93 billion light-years across. So far, no human has ventured farther than 1.3 light-seconds from Earth.
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The observable universe extends for about 92 billion light-years. No human has ventured farther from Earth than 1.29 light-seconds.
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"It is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring."--Carl Sagan, died OTD 1996.
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On this date in 1915, Albert Einstein completes the general theory of relativity, giving us one of the most beautiful equations ever conceived (LHS describes the curvature of spacetime, RHS describes the matter and energy in spacetime).
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It is deeply sad that the very same species which revealed the secrets of the atom, peered back to nearly the big bang, and grasped the mysteries of warped spacetime can be so horrifically cruel and barbaric.
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Pi Day: The day Albert Einstein joined the world and now also the day that Stephen Hawking left.
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We spend our lives floating on a sea of repelling electrons. We never actually touch anything.
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Why I was drawn to mathematics: its truths seemed eternal. Why I've focused on physics: its truths speak to reality.
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It is hard to express how utterly remarkable and astoundingly delightful it is that mathematical scribblings can predict something as bizarre as black holes and then, looking to the skies with sufficient diligence, we find them.
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When you cross over the edge of a black hole, space and time interchange their roles. You are drawn toward the black hole's center with the same inevitability as you are drawn to the next moment in time.
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The new claim of superconductivity at ordinary temperatures and pressures would be--if true--an utterly revolutionary breakthrough...but history in this arena suggests extreme skepticism until it's thoroughly vetted and confirmed.
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I just felt the need to marvel momentarily at the equation for a rotating black hole.
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I am deeply saddened to announce the passing of my loving, vivacious, fiercely loyal, always laughing, and deeply caring mother, Rita Greene. I love you mom with all my heart. I miss you to the core of my being.
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The black hole solution of Einstein's equations in honor of today's
#NobelPrize2020
announcement:
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March for Science is now scheduled: Saturday, April 22, in Washington D.C. Spread the word.
#marchforscience
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The universe is 13.8 billion years old, and yet we can "see" objects that are now more than 45 billion light-years away. Let that twist up your brain as you drop off to sleep tonight.
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Calling something a "singularity" is a physicist's way of saying "we don't know what the heck we're talking about."
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It is stunning and tragic that the very same species which revealed the secrets of the atom, peered back to nearly the big bang, and grasped the mysteries of warped spacetime can be so horrifically shortsighted.
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The Large Hadron collider started up its third run today, which should last four years, and will have the highest energy particle collisions we've ever achieved. The most exciting prospect? Finding something totally unexpected.
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On this date in 1915, Albert Einstein announces that he has completed his ten year odyssey toward the field equations of the general theory of relativity.
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Mathematical elegance is embodied in this single expression at the heart of classical physics. Vast insight in a few symbols.
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"Equations are more important to me because politics is for the present, while an equation is for eternity." -- Albert Einstein
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"Science is a way of thinking much more than it is a body of knowledge." -- Carl Sagan, died OTD 1996.
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Event Horizon Telescope reveals first ever direct image of a black hole. Einstein's equations seem to triumph once again.
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We spend our lives floating on a sea of repelling electrons. We never actually touch anything. Just saying.
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To my mind, the biggest unsettled question in Quantum Mechanics is: How does the wavy probabilistic haze central to the mathematical formulation of the theory transform into the single definite reality of experience?
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Erwin Schrödinger, who discovered the fundamental equation of quantum mechanics, born OTD, 1887. Probably.
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Major scientific announcement expected tomorrow regarding the long sought milestone of harnessing nuclear fusion to create more energy than scientists put in--one step closer to poetically creating a small star here on Earth.
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"It is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring."--Carl Sagan, died OTD 1996.
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Isaac Newton publishes his Principia, among the most influential scientific texts of all time, OTD in 1687.
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In honor of 11/11 a favorite numerical factoid:
111,111,111 x 111,111,111 = 12345678987654321
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"It is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring."--Carl Sagan, died OTD 1996.
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A short and sleek equation captures classical physics--that is what we mean by mathematical elegance.
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Nine years ago today, the existence of the Higgs particle was confirmed--completing the Standard Model of Particle Physics and introducing the first fundamental particle that has no intrinsic spin. The power of math and experiment.
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Here's one shocking thing about quantum mechanics: As a particle travels, it explores every possible path, and what we observe is a particular melding of them all.
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A glance a today's cutting-edge description of nature hints at why we think there may be a simpler theory awaiting discovery.
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A little science to round out your Fourth of July. (My favorite: Fireworks that glitter, often created with antimony.)
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If you could travel to the past, you would not change anything. You would have always been part of that time. There are not two versions of a moment in time, one without you and one with you. Moments in time just ARE. They don't change.
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Steven Weinberg, one of the greatest thinkers of our age, has died. With an astounding ability to see into the deep workings of nature, Steve profoundly shaped our understanding of the universe. His passing is a colossal loss to science and the world.
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Werner Heisenberg, whose uncertainty principle established a central role for chance in the quantum laws of physics, born OTD 1901. Probably.
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"Equations are more important to me because politics is for the present, while an equation is for eternity." -- Albert Einstein
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Erwin Schrödinger, who discovered the fundamental equation of quantum mechanics, born OTD, 1887. Probably.
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Here is the mystery at the core of quantum physics: How does the wavy, probabilistic haze inherent in the mathematical description of quantum mechanics transform into the single definite reality of experience?
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The observable universe is more than 90 billion light-years across. So far, no human has ventured farther than 1.3 light-seconds from Earth.
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Albert Einstein was not the first to solve Einstein's Equations: Karl Schwarzschild (who died this week in 1916) found the first exact solution to the equations of General Relativity--a solution that, among much else, revealed the possibility of black holes.
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A flawless launch of the
@NASAWebb
Space Telescope, as the most powerful tool to explore the cosmos begins its decade long mission to
#UnfoldTheUniverse
. A Christmas gift to humanity.
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Tomorrow morning: Event Horizon Telescope reveals the first direct image of the edge of a black hole. Most exciting possibility: The image does not fully agree with the prediction from Einstein's general relativity, perhaps forcing us to modify Einstein's equations.
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Two quantum entangled particles could be on opposite sides of the universe and yet they'd act as one. That's spectacular.
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Here's one shocking thing about quantum mechanics: As a particle travels it explores every possible path, and what we observe is a melding of them all.
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"The miracle of the appropriateness of the language of mathematics for the formulation of the laws of physics is a wonderful gift which we neither understand nor deserve."--Eugene Wigner, born this week, 1902.
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Among the most beautiful equation in all of physics, bringing together gravity (G). quantum mechanics (h), relativity (c), to quantify the entropy of a black hole (the Bekenstein-Hawking formula).
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Grasp a glass and you don't actually touch it. Electrons in your hand push against those in the glass creating a tiny but unbridgeable gap. Sit in a chair and you actually hover slightly above its surface. You've never had direct physical contact with anything.
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"Black holes are where God divided by zero."--Steven Wright. Quantum gravity is where such mathematical singularities, whether of human or divine origin, will be resolved.
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Congratulations to Roger Penrose, Reinhard Genzel, and Andrea Ghez whose insights into black holes have been awarded the 2020
#NobelPrize
in Physics.
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My favorite palindrome, honoring today's date, 1/11:
111111111 x 111111111 = 12345678987654321
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This week in 1915: Albert Einstein completes the general theory of relativity, giving us one of the most beautiful equations ever conceived (LHS describes the curvature of spacetime, RHS describes the matter and energy in spacetime).
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In quantum mechanics, we often say that a particle can be two places at once. It is more precise to say that there are situations when a particle may not have a location at all. Which is deeply weird.
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"We must be clear that when it comes to atoms, language can be used only as in poetry." --Niels Bohr, pioneer of quantum mechanics, born OTD 1885
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Don’t ban ChatGPT from the classroom. Educators must develop new assignments that guide students to find and refine their own voice in collaboration with AI tools. Schools must usher students to the future, not hide from powerful technological developments.
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Stephen Hawking would have been 77 today. He left us with deep, essential and still puzzling insights into the nature of space, time and gravity.
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99 years ago today: Sir Arthur Eddington and his team measure the bending of distant starlight during a solar eclipse, confirming Einstein's general theory of relativity.
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As you try to doze off to sleep, best not to think of the hundred trillion neutrinos passing through your body each second.
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Werner Heisenberg, pioneer of quantum uncertainty, born this week, 1901. Probably.
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Hundreds of billions of galaxies, each containing hundreds of billions of stars, many endowed with planets. That's Science. And Poetry.
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On this date in 1915, Albert Einstein announces that he has completed his ten year odyssey in search of the field equations of the general theory of relativity.
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A short and sleek equation captures classical physics--that is what we mean by mathematical elegance.
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When a particle of matter loses energy it slows down. When a tachyon particle--a hypothetical particle that travels faster than light--loses energy it speeds up. That's how a tachyon would never have a speed slower than that of light.
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What's shocking about quantum mechanics? A particle traveling from here to there explores every possible path, and what we observe is a melding of them all.
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Quantum Mechanics in a nutshell: A particle goes from here to there by sampling every possible trajectory from here to there.
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Think of the rivers of blood spilled by generals and emperors to become the momentary masters of a fraction of a dot. –Carl Sagan
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A possible shape for the extra dimensions required by string theory. (This is a slice/projection of the zeroes of a quintic equation in complex projective four space.)
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"The imagination of nature is far, far greater than the imagination of man."--Richard Feynman, born OTD 1918.
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What's shocking about quantum mechanics? A particle traveling from here to there explores every possible path, and what we observe is a melding of them all.
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We often say protons are made of 3 quarks, but that's a gross simplification. The 3 quarks contribute less than 1% of the proton's mass. The other 99% comes from a frothing sea of quantum fields that permeate the proton.
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"I much prefer the sharpest criticism of a single intelligent man to the thoughtless approval of the masses."--Johannes Kepler, born OTD 1571.
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The famous Earth-rise image taken on Christmas Eve 1968 still fills me with optimism. The wonderful power of perspective. Happy Holidays to all.
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A glance a today's cutting edge description of nature hints at why we think there may be a simpler theory awaiting discovery.
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"I have deeply regretted that I did not proceed far enough to understand the great leading principles of mathematics, for men thus endowed seem to have an extra sense."--Charles Darwin, born OTD, 1809. (But hey, even without the math, Darwin seems to have done just fine.)
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It's Official: Gravitational waves from colliding neutron stars detected--first ever events both heard with gravity and seen with light.
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A glance a today's cutting-edge description of nature hints at why some think there's a simpler theory awaiting discovery. (Symmetry and notation render a more tidy version, but below all details are laid bare.)
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Here, according to string theory, is one possibility for what the extra dimensions might look like.
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"An equation has no meaning for me unless it expresses a thought of god." --Srinivasa Ramanujan, born OTD 1887.
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"The best that most of us can hope to achieve in physics is simply to misunderstand at a deeper level."--Wolfgang Pauli, pioneer of quantum physics and Nobel Laureate, died OTD 1958.
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OTD 1687, Isaac Newton publishes his Principia--perhaps the single most important scientific treatise of all time--forever changing our understanding of the universe.
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It is utterly wondrous that the mathematical symbols we scratch out on blackboards and notepads can predict what happens as a baseball soars, as black holes collide, or as space swells.
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Emmy Noether, who died OTD 1935, derived one of the most important theorems in theoretical physics, establishing a powerful link between symmetries of a system and conserved quantities.
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Marie Curie, born OTD 1867, first woman to win the Nobel Prize. Kamala Harris, OTD, first woman vice president-elect of United States. A great day for women, science, America, and the future of the planet.
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For all of you with a weekend yearning to see the mathematics describing a rotating black hole...
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Grasp a glass and you don't actually touch it. Electrons in your hand push against those in the glass creating a tiny but unbridgeable gap. Sit in a chair and you actually hover slightly above its surface. You've never had direct physical contact with anything.
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A common misunderstanding: In quantum teleportation, matter is NOT teleported. Instead, quantum information describing matter is teleported. Which raises the question: Are you the sum of your information?
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