Yes, string theory is not physics because strings are "made of nothing". Only if strings were replaced by dimensions of quantities "Length" and "Time" could one speak of a real physical theory. I have a question: Will extra dimensions be real if they are "built" as mathematical dimensions?

dude it's the quasicrystal Penrose tiling guy!

String Theory is based on Jean d'Alembert's concept of an extended cartesian space. General Relativity and Quantum Mechanics are both based on Euclidean Geomertry. Cartesian geometry is, specifically, a graphing logic based on Euclidean Geometry and numerical data representation. The problem with cartesian geometry is that we "impose" a structure for the universe prior to performing measurements. However, in Euclidean Geometry, no such pre-existing space is ever defined. Euclidean Geometry is purely measurement-driven operations derived directly from the real people working throughout the world building houses, constructing foundations, making pottery, composing art. These are trades, and the people who worked in these trades gradually began to recognize special relationships and documented these relationships. All that knowledge was assembled into one place and given to a philosopher. Euclid. Euclidean Geometry is the raw extraction of the properties of measuring physical things. Euclidean Geometry is Physics, in its purest form. Cartesian geometry is "graphing" logic, and only that. In ordinary cartesian space, you can apply Euclidean Geometry just fine. But the moment to start manipulating the background environment, which is what happened when Jean d'Alembert started wondering about 4-dimensional spaces, you'll get the path of String Theory. A concept that is purely driven by mathematics, and not observation. It is a compound game of "telephone" across a 400-year span of time.

Penrose doesn't like the extra dimensions (I suppose like people didn't like curved space-time at first, either). But he finally hit on string theory's real problem - the lack of experimental data. That is the Achille's heel of string theory.

And yet, here we are! Go DeepSeek

I think, when real human brains halucinate or fabulate, they are NOT behaving intelligently - and so is so-called AI. Then let's call it AP - artificial parrots.

LOL what a tit

this has alway been my main gripe with string theory. How come you are taking a theory about the real world which can neither be tested and only works in higher dimension which are not true.

And it did!

Thank you so much Dr. Penrose for seeing physics for what it really is: a science: based on observation and predictions.

What a shame about current world !!! People who have no clue how rigorous , how extensive and how mind killing the mathematical physics is , are making comments here and fun on one of the most revered minds , superficially contemplating his depth. Half knowledge or part knowledge always leads to darkness and destruction . May be this is the reason 99% of the people suffer from Mental Wellbeing problems without doing anything productive for human consciousness , because they have not learnt the beauty of respect and purity which are analogous and commutative too. May the Truth come upon everyone . Best from Cambridge , MA. 😢😢😢

I think it's theoretically expediant to explain away certain unknowns as simply being in "another dimension."

I wish Penrose would stop pontificating. His actual contributions to science ended a long time ago. The search goes on - why criticize those that are still working?

This guy has not soul that why is agains everything that give you a hope

Penrose and Hawking studied together and became two of the greatest minds in the twentieth century.

viejo Gaga ya pasó un año y argentina crece en ciencias tmb, firmame la chota la próxima vez

Nah but hear me out...what if there were more strings?

So String Theory is basically over-funded mathematical speculation?!

The exact same speech was delivered by Cardinal Bellarmine regarding Galileo's geokineticism, for the exact same reasons: not experimentally testable, logical arguments are sufficiently convincing. Stellar parallax required much more advanced telescopes to measure. You have to have a healthy ecosystem of mathematically valid hypothetical models that await measurability, which is always constrained by technology, which develops by means of this kind of hypothesizing and testing, repeatedly, as a growing feedback loop. All science can say about something like string theory is: let's wait for evidence, one way or another. It's not a matter of taking something seriously before experimental validation. Physics is not, never was, and cannot, operate independently. All calculable facts are a spectrum ranging from the abstract to the measurable. There is no clear cut line.

Navigate to spend the rest of his life proving there's a God in them particles .Go man, hahaha

Autor of Twister theorie and repet's Univers !

Geniusz !!!!!!!!!!!!!!!!!!!!!!!!!!

Frank Martin DiMeglio is the world leader in theoretical physics.

As long as we don't have the means to falsify string theory, it isn't a theory, but a hypothesis.

Vulgar empiricist dogma and nothing more. The universe doesn’t care whether we are technologically capable of testing a theory or not. Theory X is either true or false no matter whether we have the capacity to test it or not.

Well, Roger Penrose is wrong.

This guy along with Hawking is responsible for universal acceptance of big bang theory, which led cosmology to become one of the pillers of modern physics

Refutation refutation refutation...

You all know Roger teaches physics with NO STRINGS ATTACHED 😂

Every time someone dishes string theory, an angel is given wings

String Theory is what grasping at straws looks like for physicists

The whole string theory idea is designed to make classical gravity a gauge theory, I e., so it has some hope of unification with the standard model. Just perhaps a square hole and round peg are rudiments of a 4-d space-time?

Borstel je tanden.

Oh wow, I had no idea you could also see the double descent phenomenon with just polynomial fitting!

String theory has its implications. In a multi verse concept, which is a reality. Penrose do consider it. He has the ability to not discard any theory, but question it.

All you Marcus fanbois here go ahead and short those A.I. stocks. I'll be in the wings taking your money.

String Theory has unlimited potential! And always will.

Agree. String theory is not physics.

String theory is complete non sense self serving to the imaginations of those people.

Yeah, and conformal cyclic cosmology is a very testable hypothesis.

I can smell the old man smell from here. What do you know about anything you God forsaken BS artist huh??? You really don't have a clue and you.knoe it.

ВСЕОБЩАЯ СТРУКТУРА ВСЕЛЕННОЙ И СПИРАЛЬ ПАРЬЕВА ПОГУГЛИТЕ

String Theory is an exersize in disabusing people of the purile notion left over from Platonism that mathematics describes nature.

String theory is like religion, either you believe or you don't. There will never be proof.

Finally someone said it. String theory is such a waste of time and money.

Great, and the rest of the nonsense out there. Stated by monkey repeated by monkeys. Thank you. Experiment beats speculation every time

He can't accept that Ed Witten is smarter than him, rejecting String Theory to the point of being personal but can't propose a better one. If 100 years later they found a way to test the theory then I say Witten is years ahead of this man much like Einstein gravitational waves predicted a 100 years or so ago and is being tested only now.

String theory isn’t the end all but it has elements of truth & has uncovered valuable reality in super symmetry. It’s an infant still.

Super symmetry is true. Gravity is not. Can’t unify.

World class comb over.