mefi 
13.03.2021, 14:25:58
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The suffering or wandering of the deserts of theoretical physicists continues. Some geniuses already see the "fet" and Morgana:
Quantum physics: our study suggests objective reality doesn’t exist...
Alternative facts are spreading like a virus across society. Now it seems they have even infected science – at least the quantum realm. This may seem counter intuitive. The scientific method is after all founded on the reliable notions of observation, measurement and repeatability. A fact, as established by a measurement, should be objective, such that all observers can agree with it.
But in a paper recently published in Science Advances, we show that, in the micro-world of atoms and particles that is governed by the strange rules of quantum mechanics, two different observers are entitled to their own facts. In other words, according to our best theory of the building blocks of nature itself, facts can actually be subjective.
Observers are powerful players in the quantum world. According to the theory, particles can be in several places or states at once – this is called a superposition. But oddly, this is only the case when they aren’t observed. The second you observe a quantum system, it picks a specific location or state – breaking the superposition. The fact that nature behaves this way has been proven multiple times in the lab – for example, in the famous double slit experiment.
Some physicists see these new developments as bolstering interpretations that allow more than one outcome to occur for an observation, for example the existence of parallel universes in which each outcome happens. Others see it as compelling evidence for intrinsically observer-dependent theories such as Quantum Bayesianism, in which an agent’s actions and experiences are central concerns of the theory. But yet others take this as a strong pointer that perhaps quantum mechanics will break down above certain complexity scales.
Clearly these are all deeply philosophical questions about the fundamental nature of reality. Whatever the answer, an interesting future awaits.
From climate change to coronavirus, science now plays a key role in more and more news stories, helping people understand that science is vital to the health of our planet, our societies, and ourselves. Donate to The Conversation and we can help ensure that scientists’ work reaches as many people as possible.
Zdroj: Stephen Harris, Commissioning Editor, Science plus Technology
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