• Pixel-art Densara, the Final-State Cartographer, on a black mug with the slogan "NO FINAL STATES. NO TRANSITION."

IndexCatalogueMug

Densara, the Final-State Cartographer Mug

\[\Gamma = \frac{2\pi}{\hbar}\, |M|^{2}\, \rho(E_f)\]
$21.99 USD
$21.99 USD
特價 售罄
Size

Fermi's golden rule: transition rate Γ = (2π/ħ)|M|² ρ(Ef). With no density of final states, there is no transition.

The joke: The job market as a density of states. The slogan on the mug reads NO FINAL STATES. NO TRANSITION.

Source: P. A. M. Dirac, Proc. R. Soc. A 114, 243 (1927); E. Fermi, Nuclear Physics (Univ. Chicago Press, 1950).

Shipping calculated at checkout by destinationMade to order, ships in ~10 days

Details

Size & material11oz · 15oz

Black glossy ceramic mug with a C-handle. Lead- and BPA-free.

  • 11oz: 0.33 l
  • 15oz: 0.44 l
CareDishwasher & microwave safe

Dishwasher safe (top rack) or hand wash. Microwave safe.

ShippingBy destination

Shipping calculated at checkout by destination.

Made to order: about 10 days of production and handling before it ships.

Delivery times & where we ship

Returns & replacements21 days

Every item is printed to order, so we can’t accept returns or exchanges for change of mind, or if you ordered the wrong size or colour.

Print defect, misprint, damage or the wrong item? We’ll send a free replacement, or a refund if you prefer. Report it within 21 days of delivery with a photo; no need to send it back.

Full refund & replacement policy

The physics

Fermi's golden rule: transition rate Γ = (2π/ħ)|M|² ρ(E_f). With no density of final states, there is no transition.

The joke: The job market as a density of states. The slogan on the mug reads NO FINAL STATES. NO TRANSITION.

Source: P. A. M. Dirac, Proc. R. Soc. A 114, 243 (1927); E. Fermi, Nuclear Physics (Univ. Chicago Press, 1950).

Equations

\[\Gamma = \frac{2\pi}{\hbar}\, |M|^{2}\, \rho(E_f)\]
SymbolMeaningUnit
\(\Gamma\) transition rate \(\mathrm{s^{-1}}\)
\(\hbar\) reduced Planck constant \(\mathrm{J·s}\)
\(M\) transition matrix element \(\mathrm{J}\)
\(\rho(E_f)\) density of final states \(\mathrm{J^{-1}}\)

Sources

  1. P. A. M. Dirac, Proc. R. Soc. A 114, 243 (1927)
  2. E. Fermi, Nuclear Physics (Univ. Chicago Press, 1950)

Field notes

檢視全部
1 3
檢視全部