The universe we live in may not be the only universe. There are many different theories that suggest the existence of many universes forming the multiverse. One such theory is the eternal inflationary multiverse theory, which posits that our universe arose from the rapid expansion of quantum fluctuations in the cosmic environment. This process can be repeated indefinitely, creating new universes with different physical laws and constants.

The universe we live in may not be the only universe. There are many different theories that suggest the existence of many universes forming the multiverse. One such theory is the eternal inflationary multiverse theory, which posits that our universe arose from the rapid expansion of quantum fluctuations in the cosmic environment. This process can be repeated indefinitely, creating new universes with different physical laws and constants. If so, then the question arises: can these universes interact with each other? And if so, how can we detect traces of that interaction? One possible solution is to study the cosmic microwave background radiation, which is evidence of the Big Bang that occurred about 13.8 billion years ago. CMB is microwave background radiation that is the same in all directions and has the spectral characteristics of a black body at a temperature of about 2.7 K. CMB radiation is not completely uniform and isotropic. It contains small fluctuations in temperature and polarization, reflecting the density inhomogeneities of primordial plasma and gravitational waves that appeared in the early Universe. These fluctuations have been measured in detail by various space observatories such as COBE, WMAP and Planck. However, hidden among these fluctuations are rarer and weaker signals related to the possibility of our Universe colliding with other universes.

How can such collisions occur? According to a hypothesis proposed by Antonio Padilla and his colleagues, our Universe may be part of a vast sphere extending into multidimensional space. This space may contain other cosmic spheres that also develop at their own pace. If two spheres come close enough to each other, they can collide, forming an area of intersection. Anomalous effects can occur in this region, such as violation of chirality symmetry, violation of the law of conservation of energy, and presence of foreign matter.

How can we detect such effects in the cosmic microwave background radiation?

One solution is to look for special patterns in the polarization of radiation that can be produced by breaking the symmetry of chirality. This symmetry means that the laws of physics do not change when subjected to reflection. However, in the collision zone of universes, this may not be true and the polarization of the radiation may then change properties from left to right or vice versa. Such changes can be detected using special instruments capable of measuring circular polarization. Another method is to look for unusually hot or cold spots at the CMB temperature, which may be associated with violations of the law of conservation of energy. In the collision zone of universes, energy can appear or disappear for no apparent reason, leading to local overheating or excessive cooling of the plasma. Such spots can be detected with very sensitive radio telescopes.

The third way is to search for traces of strange matter in cosmic microwave radiation. Exotic matter is matter that has negative density and pressure and can violate the normal conditions of energy inequality. Such matter could appear in the collision zone of the universe and influence the propagation of photons. For example, foreign matter can cause lensing of the cosmic microwave background radiation, that is, distort its shape and increase its intensity.

All of these methods require very precise measurements and complex data processing, because signals from collisions in space can be very weak and obscured by other factors. Therefore, to test these hypotheses, it is necessary to conduct experiments capable of simulating such collisions under laboratory conditions. Such an experiment was recently proposed by a group of physicists led by Max Rietz of the University of Southampton. This experiment is based on the use of an optical resonator, which is an annular cavity filled with light. Light in a resonator can only propagate in certain modes, corresponding to standing waves of certain frequencies and wavelengths. These modes may be similar to the modes of the cosmic microwave background radiation in our Universe. However, if a small number of atoms capable of absorbing and emitting light are introduced into the resonator, the modes can change. This may be similar to the effect of strange matter from another universe on the cosmic microwave background radiation. In this way, experimenters can observe the frequency and wavelength changes of light modes in the resonator and compare them with theoretical predictions.

This experiment was one of the first attempts to test the cosmic collision hypothesis in the laboratory. This could help establish how realistic this hypothesis is and what constraints might be placed on the parameters of the multiverse. Furthermore, it could provide new approaches to study the cosmic microwave background radiation and search for anomalies there. In conclusion, we can say that the question of the existence of parallel universes and their interaction with our Universe remains one of the most interesting and complex questions in current physics. grand. To solve it, it is necessary to combine theoretical developments, space observations and laboratory experiments. This is the only way we can get closer to understanding the nature of our world and its place in the multiverse.