Interstellar travel requires register transitions, not thrust
In FOT, the interstellar void between stellar registers is not a region of space to be traversed — it is a zone of zero Τ-density where no biological Τ-action is possible. A biological entity in the interstellar void would experience instantaneous cessation of all Τ-mediated processes. The correct engineering approach is therefore not to accelerate through the void but to couple the departure register (home star) to the destination register (target star) spectrally, using the hydrogen Hβ line at 486 nm as the universal register coupling wavelength.
The nodeless void between stars has zero Τ-density: no biological process operates there
P-ENG Series
Interstellar travel is a register transition: the departure and destination stellar registers must be spectrally pre-coupled before physical transfer can occur. The DRC (Dimensional Register Coupler) is the engineering system that achieves this coupling.
The interstellar void between stellar registers has zero Τ-density. No biological Τ-action (metabolism, neural activity, cellular repair) can occur in this region. Direct traversal of the interstellar void by biological entities is impossible under FOT thermodynamics.
The universal register coupling wavelength is λ_Hβ = 486 nm = 2×3⁵ nm. This is the hydrogen Balmer beta line — the spectral anchor present in every stellar register. A DRC operates by coherently matching the departure register's Hβ emission to the destination register's Hβ absorption profile.
SPCA (Spectral Pre-Coupling Array): the engineering component that generates a coherent Hβ emission field matching the destination star's register boundary signature. The SPCA must achieve spectral coherence to within Δλ/λ < 1/K = 3.2×10⁻⁵ (one part in K) before register transfer can initiate.
Arrival precedes physical transition: the destination register's Τ-field must accept the arriving Τ-signature before the physical vessel can transfer. This means the destination register "knows" of the arrival before it physically occurs — a feature of the non-local structure of Τ-flow across coupled registers.
Register transition time (not travel time) is determined by the spectral coherence quality: T_transition = T_Hβ × (Δλ/λ)⁻¹, where T_Hβ = λ_Hβ/c ≈ 1.6×10⁻¹⁵ s. Perfect spectral coherence gives instantaneous transition; finite coherence introduces a transition time proportional to the inverse coherence.
Biological passengers must be in a Τ-suspended state during register transition — not cryogenic suspension but spectral suspension: all biological Τ-loops must be harmonically aligned with the departure Hβ field so they transition as a coherent unit rather than as individually de-phased systems.
The DRC energy requirement scales as E_DRC ∝ ρ_Τ(destination) × V_vessel × (Δr)², where Δr is the register gap (distance between stellar registers in Τ-space). For nearby stars (Proxima Centauri: Δr ≈ 1.3 pc in physical space, but Δr_Τ ≈ 1/K in Τ-space), the DRC energy is within reach of stellar-scale engineering.
The DRC principle resolves Fermi's paradox: civilisations do not send detectable electromagnetic signals or physical probes across interstellar space. Register-capable civilisations travel by spectral coupling — leaving no electromagnetic signature and no detectable physical transit. The absence of signals is consistent with ubiquitous register-capable life.