Friedmann Equation decal for Walls, Computers or as Bumper Sticker

Friedmann Equation decal for Walls, Computers or as Bumper Sticker

$7.99

Spend $50 and get 15% off your order



The Friedmann equation describes the expansion of space in homogeneous and isotropic models of the universe within the context of general relativity.

Where the ratio a:/a= H ( the Hubble constant),G, Λ, and c are universal constants (G is Newton's gravitational constant, Λ is the cosmological constant, and c is the speed of light in vacuum). k is constant throughout a particular solution, but may vary from one solution to another. a, H, ρ, and p are functions of time. ρ, and p are the density and pressure, respectively.

It can be applied to any smooth surface, comes in two sizes and two colors. Contact us if you require custom size or color.

Proudly Made in the USA.

Shipping from United States

Processing time

1-3 weeks

Customs and import taxes

Buyers are responsible for any customs and import taxes that may apply. I'm not responsible for delays due to customs.

Payment Options

Secure options
  • Accepts Etsy gift cards

Returns & Exchanges

I gladly accept returns and exchanges

Just contact me within: 14 days of delivery

Ship items back to me within: 30 days of delivery

I don't accept cancellations

But please contact me if you have any problems with your order.

The following items can't be returned or exchanged

Because of the nature of these items, unless they arrive damaged or defective, I can't accept returns for:

  • Custom or personalized orders
  • Perishable products (like food or flowers)
  • Digital downloads
  • Intimate items (for health/hygiene reasons)
  • Items on sale

Conditions of return

Buyers are responsible for return shipping costs. If the item is not returned in its original condition, the buyer is responsible for any loss in value.

Legal imprint