# Does antimatter also have gravity? Is the earth attracting or rejecting it?

category:Internet (According to the theory of general relativity, the curvature of space-time determined by the distribution of mass produces gravity. The quality of antimatter is the same as that of mass in gravity field, which needs experimental confirmation.

In nature, each particle follows the same rules, experiences the same forces, and feels the same basic constants. Every entity in the universe is also affected by the gravity of the earth, sometimes described by the acceleration of gravity, and sometimes by the curvature of space-time.

Photons and normal, stable particles fall as expected in the gravitational field, and the Earth causes any particle of mass to move toward the center of the Earth at an acceleration of 9.8m/s ^ 2. However, we have never measured the gravitational acceleration of antimatter. An experiment is trying to determine this, which may become the key point of a technological revolution.

(ALPHA) the trajectories of the anti hydrogen atoms in the experiment. We can now stabilize them for 20 minutes at a time, and the next logical step is to measure their behavior in the gravitational field.

There are two totally different ways of thinking about quality. One kind of mass is the inertial mass, which accelerates when you exert a force on a mass object. This is what Newtons second law F = ma describes. The other mass is the gravitational mass, where the mass m appears in the gravitational formula of the earths surface (w = mg) or the Newtonian law of gravity formula F = GmM / r2. For normal matter, the inertial mass and the gravitational mass are equal.

(Newtons law of universal gravitation (L) and Coulombs static law (R) have almost the same form.

However, for antimatter, we can not measure at all. We exert a non-gravitational force on the antimatter and see that it accelerates, which is exactly the same as the inertial mass of a normal matter. F=ma and E=mc2 are suitable for both antimatter and normal substances.

But if we want to know about the gravitational behavior of antimatter, we cant just stay in the theoretical expectations, we have to make experimental measurements. Fortunately, one experiment is designed to do this: the ALPHA experiment at the European Institute of Particle Physics (CERN).

(ALPHA is the closest experiment to measure the behavior of neutral antimatter in a gravitational field, and the ALPHA-g detector may help us find out.)

Antiprotons and positrons (antielectrons) can be created, slowed down, and forced to interact to form neutral antihydrogen atoms. Using a combination of electric and magnetic fields, we can limit these antiatoms and keep them stable from the substances that cause them to disappear.

We succeeded in stabilizing them for about 20 minutes at a time, far exceeding the microsecond time of the existence of unstable elementary particles. When we hit them with photons, we find that they have the same emission and absorption spectra as atoms. It is important that we have determined that the nature of antimatter is exactly the same as that predicted by standard physics.

Of course, except gravity. The new ALPHA-g detector, made by TRIUMF, the Canadian National Laboratory of Particle and Nuclear Physics, was shipped to the European Institute of Particle Physics (CERN) this year. The detector will raise the limitation of the acceleration of the anti gravity to the critical threshold. Will the acceleration of antimatter reach +9.8m/s ^ 2 (downline), - 9.8m/s ^ 2 (up line), 0m/s ^ 2 (absolutely gravitational acceleration) or some other value in the presence of the gravitational field on the earths surface?

From the perspective of theory and application, any outcome beyond the expected +9.8m/s2 will be revolutionary.

(If a certain type of matter has a negative gravitational charge, it will be repelled by matter and energy as we know it.)

The inertia mass, charge, spin and magnetism of antimatter have been confirmed. The binding and transition properties of antimatter have been measured by other detectors in the Alpha experiment, and the results are consistent with the predictions of particle physics.

But if the acceleration of gravity becomes negative instead of positive, the world will be reversed.

The possibility of artificial gravity is tempting, but it is based on the existence of negative gravity mass. Antimatter may be of such quality, but we do not yet know that it requires experimentation.

In the case of an electrical conductor, free charges exist on the surface and can move. When other charges are around, these free charges can redistribute themselves by flowing on the surface of the conductor in response. If there is an electric charge outside the conductor, the inside of the conductor will be shielded from the influence of external power, and there is no way to create a uniform gravitational field in a space area.

(Capacitance schematics, in which two parallel conducting plates have equal charges and opposite charges, forming a uniform electric field between them. Such a structure is impossible for gravity unless there is some form of negative gravity mass.

But if there is a negative gravitational mass, all of this will change. If antimatter is actually antigravitational, gravity would think that it is made up of antimass or antienergy. According to the laws of physics that we now understand, mass such as antimass or antienergy does not exist. We can imagine them and discuss their behavior, but when it comes to gravity, we expect antimatter to have normal mass and normal energy.

But if anti-quality does exist, a series of great technological advances that science fiction writers have imagined for generations will be possible.

We can build a gravitational conductor to protect ourselves from gravity. We can build a gravitational capacitance in space to create a uniform artificial gravity field.

We can even create distorted drives, just as Miguel Alcubierre discovered the mathematical solution of general relativity in 1994.

(the general relativistic Algerian solution makes motion similar to distortion driven. This solution requires negative gravitational mass, which is what antimatter can provide.

This is an incredible possibility that almost all theoretical physicists believe is highly unlikely. But no matter how wild or tame your theory is, you have to test it with absolute experimental data. Only by measuring and testing the universe can you determine exactly how the laws of nature work. When we measure the gravitational acceleration of antimatter, we must be open to the unknown in nature. For antimatter, the equivalence principle may not be valid. In fact, it may be 100% true. If so, a new world of possibility will be opened. We can change the known limits that humans can now create in the universe. In a few years, well see the answer in the simplest experiment: Place an antiatom in a gravitational field and observe where it falls. Source: NetEase science editor: Qiao Jun Jing _NBJ11279

This is an incredible possibility that almost all theoretical physicists believe is highly unlikely. But no matter how wild or tame your theory is, you have to test it with absolute experimental data. Only by measuring and testing the universe can you determine exactly how the laws of nature work.

When we measure the gravitational acceleration of antimatter, we must be open to the unknown in nature. For antimatter, the equivalence principle may not be valid. In fact, it may be 100% true. If so, a new world of possibility will be opened. We can change the known limits that humans can now create in the universe. In a few years, well see the answer in the simplest experiment: Place an antiatom in a gravitational field and observe where it falls.