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theorem

delta_w0_max_pos

proved
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module
IndisputableMonolith.Cosmology.BITKernelFamilies
domain
Cosmology
line
76 · github
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IndisputableMonolith.Cosmology.BITKernelFamilies on GitHub at line 76.

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  73/-- The maximum BIT amplitude is `J(φ) = φ - 3/2 ≈ 0.118`. -/
  74def delta_w0_max : ℝ := phi - 3 / 2
  75
  76theorem delta_w0_max_pos : 0 < delta_w0_max := by
  77  unfold delta_w0_max
  78  have := phi_gt_onePointFive
  79  linarith
  80
  81theorem delta_w0_max_lt_one : delta_w0_max < 1 := by
  82  unfold delta_w0_max
  83  have := phi_lt_two
  84  linarith
  85
  86/-- The effective equation of state under BIT. -/
  87def w_eff (k : KernelFamily) (z delta_w0 : ℝ) (z0 : ℝ := 1) : ℝ :=
  88  -1 + delta_w0 * kernel k z z0
  89
  90/-- At `z = 0`, `w_eff = -1 + δw_0` for any kernel. -/
  91theorem w_eff_at_zero (k : KernelFamily) (delta_w0 z0 : ℝ) :
  92    w_eff k 0 delta_w0 z0 = -1 + delta_w0 := by
  93  unfold w_eff
  94  rw [kernel_at_zero]
  95  ring
  96
  97/-! ## Master certificate -/
  98
  99/-- **BIT KERNEL FAMILIES MASTER CERTIFICATE.** -/
 100structure BITKernelFamiliesCert where
 101  kernel_at_zero_one :
 102    ∀ k : KernelFamily, ∀ z0 : ℝ, kernel k 0 z0 = 1
 103  delta_w0_max_pos :
 104    0 < delta_w0_max
 105  delta_w0_max_lt_one :
 106    delta_w0_max < 1