Frasi di Frank Wilczek (49 frasi) | Citazioni e frasi celebri

“Quite undeservedly, the ether has acquired a bad name.”

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Frank Wilczek

Fantastic realities: 49 mind journeys and a trip to Stockholm, Singapore: World Scientific, 2006, p. 293, and "The Persistence of Ether": Physics Today, Vol. 52, Issue 1, pp. 11–13 (January 1999) http://xserver2.lns.mit.edu/%7Ecsuggs/physics_today/phystoday/Ether.pdf

“There is a simple rule for composite objects, such as nuclei or atoms. The rule is that if such an object contains an odd number of fermions, the composite object is a fermion. Otherwise, it is a boson. …this simple rule doesn't care at all about the number of bosons in the composite object.”

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Frank Wilczek

Longing for the Harmonies: Themes and Variations from Modern Physics (1987)

“A common habit of thought… is the idea that space is [a] simple receptacle in which bodies move around, with no two bodies present at the same point. …In modern quantum physics generally, and in the standard model of fundamental physics in particular, physical space appears as a far more flexible framework. Many kinds of particles can be present at the same point in space at the same time. Indeed, the primary ingredients of the standard model are not particles at all, but an abundance of quantum fields, each a complex object in itself, and all omnipresent.”

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Frank Wilczek

"Multiversality" (2013)

“So let us listen to the light—what music do we hear? For one thing, we can elicit from each chemical element its own, unique chord. You may sometimes have noticed that a bright yellow flash is produced if ordinary table salt is sprinkled on a flame…a first bare hint of the subject of flame spectra… The fact that different elements emit light with different color characteristics is exploited by the makers of fireworks.”

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Frank Wilczek

Longing for the Harmonies: Themes and Variations from Modern Physics (1987)

“The result will be points of quiescence—technically known as nodes—where the air's density varies not at all, and no sound is heard. Note the paradox here: either sphere alone creates a sound wave at this point; two spheres together add up to no sound there at all. Two sources can add up to give less than one. This is the essence of destructive interference. (When two sources are giving the same instruction, the resulting vibration bears not twice but four times the energy. This phenomenon, oxymoronically known as constructive interference, may seem puzzling.)”

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Frank Wilczek

Origine: Longing for the Harmonies: Themes and Variations from Modern Physics (1987), Ch.12 Light as Waves

“To understand this radiation [ cosmic microwave background ], it is easier to begin thinking about the radiation from a very hot gas like that inside a neon light. The same neon… is, at room temperature, utterly transparent… The character of matter in general changes abruptly when it gets heated above 3,000 degrees or so. Below this temperature, matter is electrically neutral… At high temperatures in a neon light, the electrically charged pieces of atoms become unstuck. Frequent and violent collisions break down neutral atoms into electrons and unbalanced nuclei. Matter in this state is called plasma, and it radiates much of its collision energy in the form of light. …a gas of neutral atoms (like air) is virtually transparent. The free [charged] nuclei and electrons of plasma, by contrast, couple to light's electromagnetic fields and absorb it very efficiently. …You …see light only from the borderline layer of neon between opaque plasma and transparent neutral atoms.”

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Frank Wilczek

Longing for the Harmonies: Themes and Variations from Modern Physics (1987)

“As the idea of permanence of objects has faded, the idea of permanence of physical laws has become better established and more powerful.”

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Frank Wilczek

Origine: Longing for the Harmonies: Themes and Variations from Modern Physics (1987), Ch.7 New Star

“E = mc2 really applies only to isolated bodies at rest. In general, when you have moving bodies, or interacting bodies, energy and mass aren't proportional. E = mc2 simply doesn't apply. …For moving bodies, the correct mass-energy equation is
E=\frac {mc^2} {\sqrt{1-\frac{v^2} {c^2}}}
where v is the velocity. For a body at rest (v=0), this becomes E = mc2. …we must consider the special case of particles with zero mass… examples include photons, color gluons, and gravitons. If we attempt to put m = 0 and v = c in our general mass-energy equation, both the numerator and denominator on the right-hand-side vanish, and we get the nonsensical relation E = 0/0. The correct result is that the energy of a photon can take any value. …The energy E of a photon is proportional to the frequency f of the light it represents. …they are related by the Planck-Einstein-Schrödinger equation E = hf, where h is Plank's constant.”

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Frank Wilczek

when the velocity <math>v</math> approaches the speed of light c, the denominator approaches 0 thus E approaches infinity, unless m = 0.
Origine: The Lightness of Being – Mass, Ether and the Unification of Forces (2008), Ch. 3, p. 19 & Appendix A