Tag Archives: quantum mechanics

String Theory Explained

What is The True Nature of Reality?

Get your geek on!

Is String Theory the final solution for all of physic’s questions or an overhyped dead end?

Correlation CAN Imply Causation! | Statistics Misconceptions

This video is about how causal models (which use causal networks) allow us to infer causation from correlation, proving the common refrain not entirely accurate: statistics CAN be used to prove causality! Including: Reichenbach’s principle, common causes, feedback, entanglement, EPR paradox, and so on.

Stop Using Quantum Mechanics as Evidence for Magic

Esther Inglis-Arkell_90pxBy Esther Inglis-Arkell via io9

Quantum mechanics is a beautiful and still-controversial idea. It is rightly popular. What’s not right is the way people use it to justify any reality-bending idea in their novels, their TV shows, or their personal philosophies. “Quantum” does not mean anything you want.

USS Enterprise_300px“Captain? I’m afraid we’re getting quantum disruptions in the quantum energy field. Should I ready the quantum torpedoes and relay a quantum message to the quantum base?”

I’m not a savvy dissector of movies. All the physics mistakes in Gravity flew right past me, but when you see something done a certain amount of times, it works even the most unresponsive of nerves. The word “quantum” is regularly dropped into science fiction in a way that basically amounts to the storyteller thinking, “I bet this is the way smart people in the future talk.” It might be the way smart people talk, but as we see in the next section, it’s also the way people talk when they’re being really stupid. What’s more, it won’t be the way the educated people of the future talk about anything.

Science can move forward in sweeping generalities, or it can move forward by becoming more and more specific. Either way, you probably shouldn’t use “quantum” to describe future science. If you’ve got a universe where starships can move at above light speed, or people can teleport, or the brain can be uploaded into a computer, the term “quantum” may be as antiquated as the term “natural philosophy.”

weeping angels doctor who_250pxIf the term “quantum” is still around, it won’t be applicable in any specific situation. Let’s put it this way, there are five different major types of light scattering – Rayleigh Scattering, Mie Scattering, Tyndall Scattering, Brillouin Scattering, and Raman Scattering. If you’re an expert and working with scattered light in any meaningful way, saying, “light is being scattered,” isn’t specific enough to get anything done. You have to know what kind of scattering you’re dealing with. Having characters in a space craft worry about a “quantum energy field” near them makes about as much sense as having characters in a war say that the enemy is shooting “matter” at them. They’ll need to use specifics to make any progress.

A fun note: the types of light scattering are all named after scientists. Instead of saying “a quantum energy field,” have your characters run into “a Bass-Van-der-Woodsen field,” because in your universe the team of Bass and Van der Woodsen made the discovery, and an educated expert would name the field instead of just saying “it’s quantum.”

It Doesn’t Mean That We Are Psychic

Okay, here’s the big one. Quantum mechanics shows that the world works in unintuitive ways, and, yes, experiments done in quantum mechanics provide results that can be interpreted in ways that lead us to odd conclusions. What quantum mechanics doesn’t do is provide evidence for whatever whack-a-doodle theory any crackpot has at the moment. These theories come in several different flavors.

quantum-entanglement_600px
First there’s quantum entanglement. I have to admit, I have a soft spot for quantum entanglement. Entanglement involves two particles having opposite spins. As long as the spins aren’t measured, they’re undetermined. This doesn’t mean that we don’t know the spins. This means that they are literally  .  .  .

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Quantum Physics: Teleportation and Holograms

Via Stuff They Don’t Want You to Know – YouTube

In countless works of fiction, authors use quantum mechanics to explain things like telepathy, teleportation or the shape of the universe. Why? Tune in to learn more about quantum physics — and why, in some cases, the truth may be stranger than fiction.

Free Energy and the Casimir Effect

steven_novellaby via NeuroLogica Blog

Free energy is to physics was creationism is to evolutionary biology. Both offer a teaching moment when you try to explain why proponents are so horribly wrong.

Free energy proponents have been abusing the laws of thermodynamics (come to think of it, so have creationists), and more recently quantum effects ala zero-point-energy. Now they are distorting a new principle of physics to justify their claims – perpetual motion 7043Bthe Casimir effect. Apparently this was a hot topic at the Breakthrough Energy Conference earlier this month.

Before I get into the specifics, I do want to address the general conspiratorial tones of the free-energy movement. I wonder if anyone influential in the free-energy subculture realizes that their conspiracy-mongering over free energy is perhaps the greatest barrier to their being taken seriously. There is also the fact that they get the science wrong, but if they think they are doing cutting edge science (rather than crank science), then convince us with science and ditch the conspiracy nonsense.

Here is the opening paragraph from a recent blog pushing the Casimir effect as a source of free energy:

Who is benefiting from suppressing scientific research? Whose power and wealth is threatened by access to clean and free energy? Who has the desire to create a system where so few have so much, and so many have so little?

OK – you lost me right there. This is a naive child’s view of the world, where “the adults” form a monolithic inscrutable force controlling the world. When you actually become an adult you may realize that no one has total control. No one and no institution is that competent, powerful, and pervasive. It would take an obviously totalitarian state to exert that much control.

FreeEnergy_Logo1_200pxIf free energy were real, someone would be making it happen. Ironically the very existence of the free-energy movement proves their own conspiracy theories wrong. If a company could produce a genuine free-energy machine, they would, and they would become the wealthiest company in the world. Further, free energy would improve everyone’s quality of life. No matter who you are, your life would become better with free energy.

Free energy proponents, apparently, would rather believe the world is run by megalomaniacs who are simultaneously brilliant (in executing their conspiracy) and idiotic (in wanting to execute their conspiracy) rather than entertain the possibility that they have the science wrong.

The Casimir Effect

casimir effectScientific American has a good quick discussion of what the Casimir effect is. The Casimir effect is related to zero point energy, which refers to the fact that a perfect vacuum in space still contains energy in quantum fluctuations. This is sometimes referred to as the quantum foam, out of which virtual particles are created and destroyed.

This quantum vacuum energy exists as various wavelengths – in fact, infinite wavelengths. When you place two mirror facing each other in a vacuum, some of these waves will fit in the space between and some will not. This creates a situation in which there is more energy in the vacuum outside the mirrors then between them, which in turn results in a tiny force attracting the two mirrors together.

This effect was predicted by Dutch physicist Hendrick Casimir in 1948, and later confirmed by experimentation. I must emphasize that this force is extremely tiny.

Here is where the free-energy gurus, however, have their fun. Our current understanding of quantum effects predicts that there is an infinite amount of this zero-point energy in the vacuum. Imagine if we could somehow tap into that energy – infinite free energy. You can see why this is an exciting idea.

There are two problems with zero-point energy as a source of free energy, however.

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Quantum Quackery

quantum-physics-lecture_600pxQuantum physics is claimed to support the mystical notion that the mind creates reality. However, an objective reality, with no special role for consciousness, human or cosmic, is consistent with all observations.

By Victor Stenger (1997) via Committee for Skeptical Inquiry – CSI

quantum_physicsCertain interpretations of quantum mechanics, the revolutionary theory developed early in the century to account for the anomalous behavior of light and atoms, are being misconstrued so as to imply that only thoughts are real and that the physical universe is the product of a cosmic mind to which the human mind is linked throughout space and time. This interpretation has provided an ostensibly scientific basis for various mind-over-matter claims, from ESP to alternative medicine. “Quantum mysticism” also forms part of the intellectual backdrop for the postmodern assertion that science has no claim on objective reality.

The word “quantum” appears frequently in New Age and modern mystical literature. For example, physician Deepak Chopra (1989) has successfully promoted a notion he calls quantum healing, which suggests we can cure all our ills by the application of sufficient mental power.

Photo courtesy Daniel Johansson

Photo courtesy Daniel Johansson

According to Chopra, this profound conclusion can be drawn from quantum physics, which he says has demonstrated that “the physical world, including our bodies, is a response of the observer. We create our bodies as we create the experience of our world” (Chopra 1993, 5). Chopra also asserts that “beliefs, thoughts, and emotions create the chemical reactions that uphold life in every cell,” and “the world you live in, including the experience of your body, is completely dictated by how you learn to perceive it” (Chopra 1993, 6). Thus illness and aging are an illusion and we can achieve what Chopra calls “ageless body, timeless mind” by the sheer force of consciousness.1

Amit Goswami, in The Self-Aware Universe: How Consciousness Creates the Material World, argues that the existence of paranormal phenomena is supported by quantum mechanics:

. . . psychic phenomena, such as distant viewing and out-of-body experiences, are examples of the nonlocal operation of consciousness . . . . Quantum mechanics undergirds such a theory by providing crucial support for the case of nonlocality of consciousness.

(Goswami 1993, 136)

Since no convincing, reproducible evidence for psychic phenomena has been found, despite 150 years of effort, this is a flimsy basis indeed for quantum consciousness.

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