I like to think that Einstein would look at string theory’s journey and smile, enjoying the theory’s remarkable geometrical features while feeling kinship with fellow travelers on the long and winding road toward unification.— Brian Greene
The most dreamy Brian Greene quotes you will be delighted to read
Sometimes attaining the deepest familiarity with a question is our best substitute for actually having the answer.
When kids look up to great scientists the way they do to great musicians and actors, civilization will jump to the next level
I was holding [my four-year-old daughter] and I said, 'Sophia, I love you more than anything in the universe.' And she turned to me and said, 'Daddy, universe or multiverse?'
Free will is the sensation of making a choice.
The sensation is real, but the choice seems illusory. Laws of physics determine the future.
All you are is a bag of particles acting out the laws of physics. That to me is pretty clear.
Sometimes nature guards her secrets with the unbreakable grip of physical law.
Sometimes the true nature of reality beckons from just beyond the horizon.
I have long thought that anyone who does not regularly - or ever - gaze up and see the wonder and glory of a dark night sky filled with countless stars loses a sense of their fundamental connectedness to the universe.
If the theory turns out to be right, that will be tremendously thick and tasty icing on the cake.
Physicists are more like avant-garde composers, willing to bend traditional rules... Mathematicians are more like classical composers.
No matter how hard you try to teach your cat general relativity, you're going to fail.
The real question is whether all your pondering and analyses will convince you that life is worth living. That's what it all comes down to.
Most people don’t question the practice of eating meat.
Many of these people care about animals and the environment, some deeply. But for some reason-force of habit, cultural norms, resistance to change-there is a fundamental disconnect whereby these feelings don’t translate into changes of behavior.
Quantum Mechanics is different. Its weirdness is evident without comparison. It is harder to train your mind to have quantum mechanical tuition, because quantum mechanics shatters our own personal, individual conception of reality
The beauty of string theory is the metaphor kind of really comes very close to the reality. The strings of string theory are vibrating the particles, vibrating the forces of nature into existence, those vibrations are sort of like musical notes. So string theory, if it's correct, would be playing out the score of the universe.
The boldness of asking deep questions may require unforeseen flexibility if we are to accept the answers.
Far from being accidental details, the properties of nature's basic building blocks are deeply entwined with the fabric of space and time.
Gravity is matter’s sugar daddy.
Einstein comes along and says, space and time can warp and curve, that's what gravity is. Now string theory comes along and says, yes, gravity, quantum mechanics, electromagnetism - all together in one package, but only if the universe has more dimensions than the ones that we see.
But, as Einstein once said, “For we convinced physicists, the distinction between past, present, and future is only an illusion, however persistent.”5
If string theory is right, the microscopic fabric of our universe is a richly intertwined multidimensional labyrinth within which the strings of the universe endlessly twist and vibrate, rhythmically beating out the laws of the cosmos.
Cosmology is among the oldest subjects to captivate our species.
And it’s no wonder. We’re storytellers, and what could be more grand than the story of creation?
A unified theory would put us at the doorstep of a vast universe of things that we could finally explore with precision.
In essence, we string theorists have been trying to work out the score of the universe, the harmonies of the universe, the mathematical vibrations that the strings would play. So musical metaphors have been with us in science since the beginning.
My best teachers were not the ones who knew all the answers, but those who were deeply excited by questions they couldn't answer.
Experimental evidence is the final arbiter of right and wrong.
How can a speck of a universe be physically identical to the great expanse we view in the heavens above?
A watch worn by a particle of light would not tick at all.
Light realizes the dreams of Ponce de Leon and the cosmetics industry: it doesn't age.
Our universe [may be] but one bubble in a grand cosmic bubble bath of universes.
When I give this talk to a physics audience, I remove the quotes from my 'Theorem'.
We are living through a remarkably privileged era, when certain deep truths about the cosmos are still within reach of the human spirit of exploration.
We might be the holographic image of a two-dimensional structure.
In quantum mechanics there is A causing B.
The equations do not stand outside that usual paradigm of physics. The real issue is that the kinds of things you predict in quantum mechanics are different from the kinds of things you predict using general relativity. Quantum mechanics, that big, new, spectacular remarkable idea is that you only predict probabilities, the likelihood of one outcome or another. That's the new idea.
...things are the way they are in our universe because if they weren't, we wouldn't be here to notice.
All mathematics is is a language that is well tuned, finely honed, to describe patterns; be it patterns in a star, which has five points that are regularly arranged, be it patterns in numbers like 2, 4, 6, 8, 10 that follow very regular progression.
Science is the process that takes us from confusion to understanding.
There are many of us thinking of one version of parallel universe theory or another. If it's all a lot of nonsense, then it's a lot of wasted effort going into this far-out idea. But if this idea is correct, it is a fantastic upheaval in our understanding.
Physicists have come to realize that mathematics, when used with sufficient care, is a proven pathway to truth.
So: if you buy the notion that reality consists of the things in your freeze-frame mental image right now, and if you agree that your now is no more valid than the now of someone located far away in space who can move freely, then reality encompasses all of the events in spacetime.
We do not know whether there are extra dimensions or multiverse.
Let's go forward with the possible ideas that come out of the mathematics. It's hard for us to imagine a universe that would have no time at all.
Evidence in support of general relativity came quickly.
Astronomers had long known that Mercury’s orbital motion around the sun deviated slightly from what Newton’s mathematics predicted. In 1915, Einstein used his new equations to recalculate Mercury’s trajectory and was able to explain the discrepancy, a realization he later described to his colleague Adrian Fokker as so thrilling that for some hours it gave him heart palpitations.
When you know the answer you want, it is often all too easy to figure out a way of getting it.
Time allows change to take place and the very evolution of the universe is what requires some conception of time. Mathematically can we write down a universe that doesn't have time? Sure. Do we think that would be realised in the larger reality that is out there? None of us take that possibility seriously.
The revelation we've come to is that we can trust our memories of a past with lower, not higher, entropy only if the big bang - the process, event, or happening that brought the universe into existence - started off the universe in an extraordinarily special, highly ordered state of low entropy.
General relativity is in the old Newtonian framework where you predict what will happen, not the probability of what will happen. And putting together the probabilities of quantum mechanics with the certainty of general relativity, that's been the big challenge and that's why we have been excited about string theory, as it's one of the only approaches that can put it together.
You should never be surprised by or feel the need to explain why any physical system is in a high entropy state.
Energy is the ultimate convertable currency.
But if you think about a practical implication of enriching your life and giving you a sense of being part of a larger cosmos and possibly being able to use this [gravitational waves] as a tool in the future maybe to listen not just to black holes colliding, but maybe listen to the big bang itself, those kind of applications may happen in the not too distant future.
Assessing existence while failing to embrace the insights of modern physics would be like wrestling in the dark with an unknown opponent.
According to inflation, the more than 100 billion galaxies, sparkling throughout space like heavenly diamonds, are nothing but quantum mechanics writ large across the sky. To me, this realization is one of the greatest wonders of the modern scientific age.