Hubble's cosmological stress paradox is explained. Free Technical Library News

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Hubble's Cosmological Stress Paradox Explained

26.01.2022

Scientists at the National Astronomical Observatory of the Chinese Academy of Sciences have proposed an explanation for the so-called Hubble voltage, that is, the paradox that the rate of expansion of the universe, measured locally, is greater than that indicated by observations of the microwave background.

According to the hypothesis that forms the basis of standard cosmology, the universe is isotropic and uniform over large distances. However, observations reveal significant deviations from isotropy: for example, the distribution of matter in one direction is greater than in the other. In addition, the Hubble constant, indicating the expansion rate of the universe, also demonstrates the difference between local and global scales.

The researchers believe that the observed deviations from isotropy can be explained by the existence of giant cosmic disturbances whose wavelength exceeds the size of the cosmological horizon - the maximum distance that light could travel since the beginning of the universe.

These perturbations are called superhorizon modes, which are oriented in one direction and do not obey standard cosmology.

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dog and smartphone 18.06.2015

Some people are so attached to their pets that they cannot part with them even at work or on a trip. And it's not about taking your favorite animal with you, but about "communicating" with it using various devices capable of broadcasting video. Here the owners will be disappointed: their beloved pet does not react to the image and seems puzzled and worried

According to Nicholas Dodman, a behavioral veterinarian at Tufts University (USA, Massachusetts) and chief scientist at DogTV, an American channel for dogs, dogs recognize their owner on the TV screen, but for them the whole picture looks very strange and misleading, because the owner himself is not in the room.

"Smartphone and tablet screens can actually cause anxiety in dogs, as small and compressed images make it difficult for dogs to realize whether the owner is real or not," says Ron Levy, chief content manager at DogTV. Levy also points out that "it all depends on the dog" and cites the iCPooch device as an example, which can often be ignored, despite the fact that it allows the dog to see the owner, and the owner to remotely treat him; while some dogs react normally to such communication and even "respond" to the owner.

Moreover, some individuals prefer hearing and smell to sight. They care about the tone of voice of the owner and his smell. Dogs have about 220 million olfactory receptors, so they cannot perceive the host on the screen, because he does not have a smell.

Recent studies have shown that dogs improve mental alertness when interacted with on a positive note. If the owner is worried about the condition of the dog in his absence, and the pet cannot communicate with him via video link due to the above reasons, then it is necessary to part with the pet with restraint, speaking in a quiet and calm tone. This will reduce his level of anxiety and anxiety regarding the departure of the owner. In any case, if the dog is calm, then in the absence of the owner, he will sleep. That is why they are so happy and cheerful when the owners return home.

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