A perfect blackbody is a kind of object that absorbs all incoming lights and appears black at room temperature. The blackbody radiation repels small nearby objects such as atom and molecules. But theoretically, it also has an attractive force on these objects. This newly unusual force is called blackbody force, which is mentioned by a group of researchers from Austria.
Now, different teams of physicist have theoretically demonstrated this phenomenon. They said, the blackbody force not only depends upon the geometry of the bodies but it also depends on both the surrounding space-time geometry and topology. Moreover, these latter factors significantly increase the strength of the blackbody force. As a result, a variety of astrophysics scenarios occurs such as planet and star formation, and possibly lab-based experiments.
In 2013, researchers showed that a blackbody force arises when the heat absorbed by a black body. It causes the blackbody to emit electromagnetic waves that shift the atomic energy levels of nearby atoms and molecules. According to researchers, atoms and molecules are attracted by blackbodies due to their high radiation intensity, pulling them together.
In a new study, scientist found two types of blackbodies there, spherical blackbodies and cylindrical blackbodies. They also described how the topology and the local curvature of the space-time influence their blackbody forces. In addition, spherical blackbodies are actually a neutron star, which spacetime is highly curved. It can generate a stronger blackbody force due to the curvature compared to blackbodies in flat space-time.
Furthermore, they also explained when the gravity modifies both the temperature of the blackbody and the solid angle then nearby atoms and molecules see the blackbody. In another case, a less dense black body such as Earth's Sun which space-time is less curved. It can also generate a blackbody force that is very similar to that of the flat case, Phys.Org reported.
Recently, scientists considered the case of the global monopole. They said, the space-time influence of spherical blackbodies is gravitational and decreases with the distance to the blackbody. When it comes to the global monopole, the influence is of a topological nature, decreasing with the distance but eventually reaching a constant value.
Apart from spherical blackbodies, researchers also found the space-time of cylindrical blackbodies is also flat. Due to this reason no gravitational correction to the temperature around it, Cornell University Library, reported. But it also has an effect on angles with nearby objects. When it becomes infinitely thin, turning into a hypothetical cosmic string, the blackbody force vanishes completely.
This newly discovered geometrical and topological influences on the blackbody force will help to understand the unusual force on objects throughout the universe. It will also help to detect Hawking radiation emitted by these latter objects. Scientist again said that such radiation obeys the blackbody spectrum. In the future, they would like to investigate the behavior of that force in other space-time, as well as the influence of extra dimensions on it.
