In French google translates this gives:
Scientists have proposed a rather interesting reason for why we haven't found strangers yet, a problem known as the Fermi paradox (if life is so abundant, where is everyone?). They suggest that intelligent extraterrestrials could be in hibernation, waiting for the universe to get colder so that they can be more productive.
This idea was proposed in the Journal of the British Interplanetary Society, with a pre-print available on arXiv. The journal was written by Anders Sandberg, Stuart Armstrong and Milan Cirkovic of the Institute for the Future of Humanity at the University of Oxford, and was recently picked up by Gizmodo.
Some people think that a much more advanced civilization than ours could become a digital race. That is to say, they will live in artificial intelligence inside computers, removing more limited charnable bodies. Experts, including Elon Musk, have suggested that this is a logical progression into the future.
If we are not alone in the universe (which we have no proof of yet), we could therefore propose more than an advanced foreign race could have descended in this way. But to get the most out of their new digital bodies, they might not like the universe right now.
The temperature of the universe at this time is 3 degrees Kelvin above absolute zero. It's quite cold, but this temperature will continue to drop as the universe grows. Sandberg and his colleagues say that the temperature in the future could allow 1030 other computer processes than is currently possible.
"So we suggest a 'topical hypothesis,'" the researchers write in their journal, adding that "the reason we don't observe manifestations of extraterrestrial civilizations is that they are currently (most of the time) inactive, patiently awaiting future cosmic epochs ". Essentially is hibernation to avoid warmer temperatures, and not cooler ones.