Sentences with phrase «if general relativity»

In some alternate theories of gravity that could take over if general relativity turns out to be wrong, the neutron star could have gravitational effects going on inside it that the relatively willowy white dwarf would not.

«If general relativity is correct, this machine is there and can accelerate particles to enormous energies, reaching — and even exceeding — the Big Bang.

It will also verify if general relativity can accurately predict the magnitude of the effect.

Thus, if general relativity is correct, there is no «before the Big Bang,» as time did not exist, nor did space, matter, and energy.

If general relativity was just a hunch, why would we have to adjust for relativistic effects to keep our GPS systems accurate?

The answer to that turns out to be «definitely maybe»: If general relativity can be extended without modification into arbitrarily high energy densities, then yes — we can show that time doesn't extend indefinitely far backwards.

Not exact matches

The reason some scientists want to prove time really does not exist is that if times does not exist then they can unify the «subatomic atomic world of quantum mechanics with the vast cosmic one of general relativity.»

It is hypocritical at best to disclaim evolution, and then get into your car, turn on your gps (which would be impossible if not for special and general relativity), and pick your favorite song on your ipod (impossible without quantum mechanics).

Even if we don't remember — or never learned — what Einstein meant by general or specific relativity, we need to understand that theoretical physics has drastically changed our understanding of reality.

I also find it unacceptable scientifically because if one is approaching it from our current understanding of Relativity, the thing that corresponds to our awareness of the universe over an interval of time is not a simultaneity slab, because in General Relativity there is no such thing.

If we then consider the general theory of relativity, it becomes clear how very far contemporary physics is from the basic concepts of the eighteenth century.

We see that if we only emphasize relativity we can end up in a relativism that undercuts itself and the value of critical thinking in general.

Loop quantum gravity, Rovelli's own specialism, is an attempt to take reconcile general relativity and quantum mechanics even if this means a theory where there is no fundamental time.

Hawking was studying the work of Roger Penrose, which proved that if Einstein's general theory of relativity is correct, at the heart of every black hole must be a point where space and time themselves break down — a singularity.

If it's Bob, then Alice will not encounter empty space at the horizon as general relativity claims.

Now, many cosmologists follow a basic recipe to simulate the universe — treating the cosmos as if it has been run through an imaginary blender to smooth out its lumps, adding dark energy and calculating the expansion via general relativity.

If unexpected kinds of stretching or squeezing were found, «it would kill general relativity, just like that.

One possibility is that if physicists ever manage to unify quantum theory and general relativity, space and time will be described by some modified version of quantum mechanics.

If firewalls exist, then general relativity requires tweaking.

Likewise, debate raged into the 1970s about whether general relativity really predicted gravity waves and, if so, whether the waves actually carried energy.

If scientists perform Gould's test, it will not be the first time the Earth has been used to test general relativity.

For if this discovery holds up to scrutiny — and some of my colleagues aren't sure that it does — it is the first direct sighting of the gravitational waves that Albert Einstein predicted shortly after he proposed his general theory of relativity in 1915.

With Roger Penrose I showed that if Einstein's general theory of relativity is correct, there would be a singularity, a point of infinite density and space - time curvature, where time has a beginning.

If they do see some waves, they will be able to test general relativity in several ways.

IN ITS MODERN FORM, the concept of black holes emerges from Einstein's general theory of relativity, which predicts that if matter is sufficiently compressed, its gravity becomes so strong that it carves out a region of space from which nothing can escape.

«If there is a deviation from general relativity, that's when we will be the most sensitive to detect such a deviation,» Hees says.

«If we see a weird shape that deviates significantly from a circle, we can try to figure out what kind of deviation from general relativity is required to produce it,» says Avery Broderick, a theoretical astrophysicist at Waterloo University and the Perimeter Institute.

If detected, Chen's effect — a derivative of the gravitational Faraday effect — would provide strong evidence of the correctness of Einstein's general relativity theory in the «strong - field regime,» or an environment in close proximity to a black hole.

The paradox has it that if black holes are as we think, they must be surrounded by rings of fire, though that would violate general relativity.

First predicted by Einstein more than a century ago as a consequence of his theory of general relativity, gravitational waves were long thought to be beyond observational reach — if not entirely nonexistent.

If we look outside the scientific enterprise of his time to the culture in general, we discover that this same turn - of - the - century period in which Einstein conceived his theory of relativity put him in the national German - speaking Jewish company of such contemporaries as Sigmund Freud, Franz Kafka, the revolutionary atonalist composer Arnold Schoenberg, the critic Walter Benjamin, the great anthropologist Franz Boas, and the philosopher of symbolic forms Ernst Cassirer.

If, like photons, these particles have no mass, then gravitational waves would travel at the speed of light, matching the prediction of the speed of gravitational waves in classical general relativity.

«If the next record holder turns out to be significantly above 2 solar masses, then we're going to have to go back to the drawing board... possibly thinking of modifications to general relativity,» says Feryal Ozel of the University of Arizona, Tucson.

That said, if the non-dust B - mode signal is as large as the BICEP2 researchers claim, it requires the existence of large - field inflation at an energy scale that unites the realms of quantum mechanics and general relativity.

Einstein's «equivalence principle», which underpins general relativity, says that if you stand in a falling elevator, your acceleration should cancel out the pull of gravity, leaving you unable to tell whether you are in free fall or whether there is simply no gravity present at all.

So if astronomers can understand the physics of the matter that is flowing into the black hole, they can use it to test the predictions of general relativity as never before — but only if the movement of the matter in the accretion disc can be completely understood.

If these results, expected soon, do not agree with the measurements of the expansion history of space — the measurements made by methods used by JDEM — it would indicate that something is wrong with general relativity.

And the other really fascinating implication of general relativity is that falling through a vacuum in curved spacetime by stretching and contracting but not at the same rate, if you stretch at one rate and contract at another rate, you can actually slow your descent and behave like a glider even though there is no atmosphere.

«If you can get to the bottom of the astrophysics, then you can really test the general relativity,» says Ingram.

However, if we assume the general principle of relativity is valid, the Earth can be considered as being at rest while the swinging plane of the pendulum and the night sky are rotating.

If this is true, it would be «as close to directly observing a black hole as possible», says Frans Pretorius, a specialist in general - relativity simulations at Princeton University in New Jersey.

But in the 1960s, the American physicist Robert H. Dicke of Princeton, who died in 1997, noted that if the interior of the sun were rotating rapidly — compared to a slower speed observed at the surface — then the non-spherical component of the sun's gravitational field could produce up to 10 percent of the effect Einstein had computed, in which case, General Relativity would be an incomplete theory of gravity.

What lies behind this is Einstein's general theory of relativity, the so - called gravitational red shift: If a clock is further way from Earth, time actually runs a little faster for it.

If gravitation is driven by something other than Einstein's theory of General Relativity, you'll see small variations in the orbital paths of the stars,» said Ghez.

However, according to general relativity, space can expand with no intrinsic limit on its rate; thus, two galaxies can separate more quickly than the speed of light if the space between them grows.)

If the observations are confirmed, then it shows that Einstein's theory of general relativity holds even under extreme conditions — in gravity fields produced by objects like the galactic center's black hole, which contains the mass of 4 million suns.

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If you've ever wanted to learn about general relativity, quantum mechanics, gravity, black holes and elementary particles, but were too intimidated, then this is the perfect introduction.

Most I think would assume that while General Relativity had strictly speaking replaced it, it was a good enough approximation for all practical purposes, but in fact if you limited gravity to the speed of light, the solar system would entirely fly apart after a few hundred thousand years.

Thus he wrote, for example, «If the redshift of spectral lines due to the gravitational potential should not exist, then the general theory of relativity will be untenable.»