Calculadora do Parâmetro de Desaceleração — Formula
## The Deceleration Parameter
The deceleration parameter q₀ tells us whether cosmic expansion is speeding up or slowing down.
### Formula (matter + Lambda)
**q0 = Omega_m / 2 - Omega_Lambda**
- Positive q0 means deceleration (gravity wins)
- Negative q0 means acceleration (dark energy wins)
Current values give q0 ≈ -0.535, confirming accelerating expansion.
The deceleration parameter q₀ tells us whether cosmic expansion is speeding up or slowing down.
### Formula (matter + Lambda)
**q0 = Omega_m / 2 - Omega_Lambda**
- Positive q0 means deceleration (gravity wins)
- Negative q0 means acceleration (dark energy wins)
Current values give q0 ≈ -0.535, confirming accelerating expansion.
Exemplo Resolvido
Standard cosmology: Omega_m = 0.31, Omega_Lambda = 0.69.
- q0 = Omega_m / 2 - Omega_Lambda
- q0 = 0.31 / 2 - 0.69
- q0 = 0.155 - 0.69
- q0 = -0.535