# Does gravity exist without matter?

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#### Infored

Spacetime is reality. My guess is that the fabric of spacetime is made of virtual mass.
interesting thought. The key seems to be in movement, linear and rotational. If I recall correctly, if any mass accelerates fast enough, it turns into pure energy, which is mass-less, but "moving" or transmitted. Im still wondering if energy, such as photons, can warp spacetime, or only be warped by a mass. Thought experiment - if everything in the cosmos came to a stand still, would anything exist? Does the cosmos exist only because all parts of it (mass and energy) move. Thoughts?

#### Truthseeker007

Gravity causes rotation.
After all you said then I guess it makes sense.

#### Ront5353

Another way to think about gravity is that mass can bend light (weightless) but can light bend anything? I think not, but not sure. In other words, pure energy cant bend space time until it is condensed into mass. Any thoughts on if gravity waves are in their own category or are the on the E-M spectrum? They travel through a vaccuum of space.
Gravity has its own vector field different than a light vector or electromagnetic vector field. Gravity is a boson particle a force particle unlike ferminions which are mass particles. Mass is a form of energy ie, E=M (E=MC squared). Gravity (graviton (spin-2) makes it different from other elementary particles that have a spin of -1 (photons, gluons, Z/W+/W-, bosons). All others according to the Standard model are electrically neutral except for the W,s and all are massless except for W,s , Z and the Higgs boson (spin-0). The Higgs boson is different from the rest it is a scalar boson having a directionless magnitude. But it is the Higgs boson that allows the vector fields (photons) of gravity or light to gain mass and energy without it everything in the universe would be on a straight line. Life would not exist in any form.

#### pittsburghjoe

I don't buy the Higgs story. It is only responsible for a fraction of the mass. What makes something physical is spacetime. The Higgs boson might have something to do with the scale instructions for the particle.

Infored

#### Ront5353

Gravity causes rotation.
Gravity does not cause rotation. Rotation of elementary particles causes gravity which is electromagnetic. G=MVC squared. Gravity has a spin-2.

#### pittsburghjoe

I wasn't talking about individual particles.

#### Ront5353

I wasn't talking about individual particles.
Humans are composed of 37 trillion atoms within those atoms are particles that create our mass. The Higgs boson is a particle with a zero spin that allows other particles to smash together to gain mass and energy.

#### pittsburghjoe

Atoms do not bond via the higgs boson.

#### Ront5353

Atoms do not bond via the higgs boson.
I never said the Higgs boson creates atoms. Particles create molecules create atoms. Higgs boson allows photons to attract to create molecular structures that turn into atoms, reverse engineer your thoughts and look at particle physics.

#### pittsburghjoe

umm ..dude, atoms create molecules

#### Ront5353

umm ..dude, atoms create molecules

#### karlschneider

Maybe this Universe itself revolves around an even greater space. I just know if this Earth were to stop in its tracks their wouldn't be much gravity. It seems the size of the planet and the inertia around the sun causes the weight which holds us down here. So the question would be what holds the Sun in space. Just some thoughts I am not read up to well on the science of gravity.lol!
Nothing, including our small star is 'held' in space. NOTHING. There is no 'static' position in the universe and that is both because and a result of the fact that everything is relative.

#### karlschneider

interesting thought. The key seems to be in movement, linear and rotational. If I recall correctly, if any mass accelerates fast enough, it turns into pure energy, which is mass-less, but "moving" or transmitted. Im still wondering if energy, such as photons, can warp spacetime, or only be warped by a mass. Thought experiment - if everything in the cosmos came to a stand still, would anything exist? Does the cosmos exist only because all parts of it (mass and energy) move. Thoughts?
Your last question is answered this way. Yes. And here is why: without any motion, electricity (and thus subatomic particles) either can't exist, or can't have any interaction with or influence on...anything.

Infored

#### Ront5353

yes where there is energy there is gravity.
For more http://engineering-and-science.com/relativity.html
Gravity is not energy but a form of energy. Gravity is the potential energy of two objects, their mass and gravitational constant. The surface of the earth would be a gravitational constant. In classical mechanics two masses always have a potential gravitational potential the key word here being potential. Mars has energy it is spinning in space, an elliptical orbit, yet its gravitational field is slowly ebbing. Ask yourself why? Water has mass and potential energy . It is resting until you add kinetic energy, gravity, surface tension, osmosis, or mechanical effects to move the molecules in another direction.

#### hud123

yes, gravity would be there but it could not do anything.

#### Hartmann352

Gravity without matter? Who would know, since we are all made of matter.

#### wdm1234

Gravity without matter? Who would know, since we are all made of matter.
I still want to know things I do not know and that's why it matters. By thinking about something we sometimes learn things. I am curious about gravity. I read and learn but some questions are still available for speculation. Hopefully leading to ideas then to experiments and on to theories about life the universe and everything. Still, your clever post made me think. Thank You.

#### Valentine Michael Smith

This reminds me of Asimov's The Billiard Ball: when encountering an anti-gravity field, will a body moving at low velocity float?

#### David J Franks

But, gravity waves can travel through a void? But they can warp spacetime, which is how we measure their passing? How do we know they are gravity waves and not some other type? Maybe a new type?
Empty space isn't void, It consists of quantum fields/fluctuations/foam/dark energy etc, so maybe gravity waves cause this to ripple. In this sense, gravity waves exist in their own right.

#### David J Franks

I never said the Higgs boson creates atoms. Particles create molecules create atoms. Higgs boson allows photons to attract to create molecular structures that turn into atoms, reverse engineer your thoughts and look at particle physics.
Molecules are formed by bonding of atoms by electric charge, The electromagnetic force is in turn mediated by virtual photons at close range and real photons at longer ranges. So. there might be a grain of truth in the quote above. All from a vague memory - needs checking!

#### Gringoz

BANNED
Does potential gravity exist or exists only in relation to matter?
Great question, unfortunately you are intelligent because you do not know remember that the people who do know are just parrots as they have no better knowledge than you. The effects of gravity on Earth are mostly predictable, however what it is defies all the math which eventually invokes mythical dark matter to explain it.

#### Hartmann352

In Quantum physics everything in the world is made of 12 quarks , Leptons and force particles. These exist in various combinations on a nano scale. It is the force particle that gives everything mass and weight. The CERN collider in Geneva, Switzerland the scientists think they have found a force particle called it Higgs particle. This is what they call the god particle. Gravity ebbs and flows according to the mass and energy of an object. Drop a ten pound ball from a prescribed height as it falls the ball is weightless from the effects of gravity until it hits a condensed mass with a stronger gravitational field.
While the actual weight of a person is determined by his mass and the acceleration of gravity, one's "perceived weight" or "effective weight" comes from the fact that he is supported by floor, chair, etc. If all support is removed suddenly and the person begins to fall freely, he feels suddenly "weightless" - so weightlessness refers to a state of being in free fall in which there is no perceived support. The state of weightlessness can be achieved in several ways, all of which involve significant physical principles.

The mass of an object is a fundamental property of the object; a numerical measure of its inertia; a fundamental measure of the amount of matter in the object. Definitions of mass often seem circular because it is such a fundamental quantity that it is hard to define in terms of something else. All mechanical qualities can be defined in terms of mass, length, and time. The usual symbol for mass is m and its SI unit is the kilogram. While the mass is normally considered to be an unchanging property of an object, at speeds approaching the speed of light one must consider the increase of its relativistic mass - as a mass approaches the speed of light, c, its mass becomes infinite.

The weight of an object is the force of gravity on the object and may be defined as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton. Density is mass/volume.

Beyond Newton, Einstein said gravity is not a force but a consequence of a curvature of space-time which in turn should mean that it would act on all masses the same way. This insight is at the core of the theory of general relativity that Einstein himself described as “the most fortunate thought in my life”. Indeed.

That most fortunate thought has now been again proved right with unprecedented accuracy:

“An international research team including astronomers from the Max Planck Institute for Radio Astronomy in Bonn determined with extremely high precision that gravity causes neutron stars and white dwarf stars to fall with equal accelerations. They did this by precisely tracking the motion of pulsar PSR J0337+1715*, a neutron star that is a member of an unusual triple star system. Their findings – achieved by a new rigorous method and a combination of radio telescope data with latest insight from gravitational wave detectors – provide the strongest test ever of one of the most fundamental predictions of general relativity: that gravity attracts all objects with the same acceleration, without regard for their composition, density or the strength of their own gravitational field,” an official release from the Max Planck Institute for Radio Astronomy in Bonn said on June 20th of this year.

“Confirming it to this precision constitutes one of the most stringent tests of Einstein’s theory ever made - and the theory passes the test with flying colors”, the release quotes Guillaume Voisin, one of the team members, as saying. "Moreover, the results also provide very stringent constraints on alternative theories of gravity, which compete with Einstein's general relativity to explain gravity and, for example, dark energy.”

“The universality of free fall is a unique feature of gravity: Unlike all other interactions in nature, gravity attracts all material objects with the same acceleration. Galileo Galilei allegedly dropped several differently-sized weights from the leaning tower of Pisa to test this. Isaac Newton later considered this to be a fundamental principle of gravity, presenting it without a deeper explanation. The most precise test of the universality of free fall has, to date, been obtained by an especially designed satellite called Microscope (developed by the Centre Nationale d'Études Spatiales, in France). The small proof masses within the satellite show identical accelerations in the gravitational field of the Earth to better than 1 part in 10 raised to 14,” it says.

* PSR J0337+1715 is an unusual neutron star located about 4,200 light-years from Earth, spinning nearly 366 times per second. It was first observed by Jason Boyles of Western Kentucky University using the
NSF's Green Bank Telescope**.

This image shows the pulsar PSR J0337+1715. Image credit: Ransom SM et al.

Such rapidly-spinning pulsars are called millisecond pulsars, and can be used by astronomers as precision tools for studying a variety of phenomena, including searches for the elusive gravitational waves.

Subsequent observations showed that PSR J0337+1715 is in a close orbit with a white dwarf star, and that pair is in orbit with another, more-distant white dwarf star.

** The Green Bank Telescope, or GBT, is the world’s premiere single-dish radio telescope operating at meter to millimeter wavelengths. Its enormous 100-meter diameter collecting area, its unblocked aperture, and its excellent surface accuracy provide unprecedented sensitivity across the telescope’s full 0.1 – 116 GHz (3.0m – 2.6mm) operating range.

The single focal plane is ideal for rapid, wide-field imaging systems – cameras. Because the GBT has access to 85% of the celestial sphere, it serves as the wide-field imaging complement to ALMA and the EVLA. Its operation is highly efficient, and it is used for observations about 6500 hours every year, with 2000-3000 hours per year available to high frequency science.

Part of the scientific strength of the GBT is its flexibility and ease of use, allowing for rapid response to new scientific ideas. It is scheduled dynamically to match project needs to the available weather. The GBT is also readily reconfigured with new and experimental hardware, adopting the best technology for any scientific pursuit. Facilities of the Green Bank Observatory are also used for other scientific research, for many programs in education and public outreach, and for training students and teachers.

#### Hayseed

Why does the continuous solar wind, accelerate away from the sun, clear thru-out our planetary system? That's a lot of acceleration with a long duration. The solar wind repulses from the sun. A very UN-mass thing to do.

#### bearnard1616

BANNED
There is no potential gravity. There is potential energy in a gravitational field. You might say that our gravity has the potential to act on objects outside of our light cone in time though.

#### bearnard1616

BANNED
Does potential gravity exist or exists only in relation to matter?
The answer would be no. Light and energy can also create gravity if there's enough in a single place. It'd be possible (or rather, not theoretically impossible) to create a black hole using only light/energy if you could concentrate enough of it in a single spot.