No physical interaction can occur instantaneously; every process requires a finite, nonzero duration; implying that Nature cannot be rushed. ^{[1][2][7][8][9]}

Historical Development

• Early Motivation
  Obidi’s original insight came from analyzing natural phenomena as occurring within an entropic field that does not interact instantaneously. Later attosecond‐scale entanglement formation experiments validated this insight, which implied a minimum interaction interval beyond the Planck time.

• Formal Statement (2025)
  The theorem was codified in the Entropic Time Limit (ETL), which was later formulated in another work which extended the theorem to include temperature‐dependent bounds and to apply in curved spacetime near black‐hole horizons.

• Subsequent Extensions
  The theorem was further recast in the Obidi’s Master Entropic Equation (MEE) framework, linking the minimum time to a Fisher‐information “stiffness” in the entropy field.

 Entropy as a Dynamic Field

• Field Promotion
  Traditionally, entropy S is a global quantity defined for systems in or near equilibrium. ToE promotes entropy to a spacetime-dependent scalar field S(x).

• Couplings and Dynamics
  Gradients and time derivatives  appear directly in the equations of motion for matter and geometry, sourcing forces and mediating interactions analogously to the electromagnetic potential or the gravitational metric.

Statement of the No-Rush Theorem

• Finite Interaction Time
  Because interactions proceed via the exchange or redistribution of entropy^[7][8][9]—through informational currents, microscopic reconfigurations, or entropic gradients—they cannot “turn on” in zero time.

• Minimum Entropic Interval
  There exists a lower bound ​, determined by the intrinsic “stiffness” of the entropic field^[11][12] (often linked to a Fisher-information term in the action), below which no causal influence can propagate.

Mathematical Formulation

• Entropy Field Dynamics
  The entropy field S(x) obeys a second‐order differential equation derived from the MEE action.

• Fisher‐Information Bound
  A term

  
  

  endows S with an intrinsic “stiffness.” The resulting dispersion relation implies a minimum group‐velocity cutoff.

• Derived Minimum Time
  One finds

  ​​

  in flat spacetime, generalizable to  when including temperature T and curvature radius R.

Physical Interpretation

• Causality from Entropy
  Beyond the relativistic light‐cone, the No-Rush bound provides a complementary causality limit rooted in information transfer rates.

• Entropic “Ramp-Up”
  Forces—gravitational, electromagnetic, strong and weak—must “build up” via entropy redistribution before reaching their full strength.

• Relation to Decoherence
  Environmental decoherence times in quantum systems mirror the No-Rush interval, tying information loss to interaction onset.

Physical Implications

1. Causality and Speed Limits

   • Provides an entropy-based origin for why no influence can travel faster than a maximum speed, complementing relativity’s light-cone structure.

2. Gravity and Inertia

   • Bodies respond not only to spacetime curvature but also to the finite “ramp-up” time of entropic forces, potentially modifying inertial behavior at very small scales.

3. Quantum Processes and the Arrow of Time

   • Embeds irreversibility at a fundamental level. Quantum transitions, measurements, and decoherence processes require a nonzero duration, reinforcing the unidirectional flow of time.

Cosmological Implications

• Early Universe Dynamics
  During reheating, entropy production rates set a lower bound on reaction times, influencing baryogenesis and dark‐matter freeze-out.

• Inflationary Constraints
  The theorem implies that fluctuations below Δtmin⁡\Delta t_{\min}Δtmin​ cannot decohere, placing a cutoff on the primordial power spectrum.

• Bounce and Cyclic Models
  In entropic‐cosmology scenarios, the minimum time moderates the transition rate between contraction and expansion phases.

Connections to Existing Concepts

• Decoherence in Open Quantum Systems
  Quantum coherence^[13] is lost over finite timescales as systems entangle with their environment—an entropy-driven process.

• Entropic Forces
  Similar to how entropy gradients drive polymer elasticity or Verlinde’s^[14] emergent gravity, the No-Rush Theorem ensures these gradients cannot act instantaneously.

• Information-Theoretic Limits
  The minimum interaction time aligns with the time needed to transfer or distinguish quanta of information, linking ToE to information-geometry and Fisher information.^[15][16]

Beyond Traditional Physics

• Challenging Instantaneous Assumptions
  Many idealized models—instantaneous collisions, ideal springs, certain gauge approximations—assume zero-time interactions. The No-Rush Theorem treats these as approximations valid only when is negligibly small compared to experimental timescales.

• Experimental Predictions
  Subtle delays or frequency-dependent response times in high-precision tests of fundamental forces could reveal the finite interaction interval predicted by ToE.

Experimental Tests and Observational Signatures

• High-Precision Force Measurements
  Frequency-dependent response delays in torsion-balance experiments could reveal Δtmin⁡\Delta t_{\min}Δtmin​-scale effects.

• Quantum Optics
  Ultrafast pump–probe experiments probing entanglement formation may detect nonzero lower bounds on correlation buildup time.

• Astrophysical Transients
  Time-resolved observations of black-hole quasi-normal ringing may exhibit slight phase lags attributable to entropic “switch-on” delays.

Criticisms and Debates

• Scale of Δt(min)⁡​
  Some argue that ​ is so small (attoseconds or less) as to be experimentally irrelevant.

• Overlap with Relativistic Causality
  Critics question whether a separate entropy‐based bound is distinguishable from the light‐cone constraint.

• Defining Local Entropy
  The assumption of a well-defined local entropy density S(x) outside equilibrium remains debated in non-equilibrium thermodynamics.

Open Questions

• Temperature and Curvature Dependence
  How does  vary with local temperature, pressure, and spacetime curvature in strong‐gravity regimes?

• Quantum Gravity Integration
  Can the No-Rush bound be derived from a full quantum‐gravitational theory, such as loop quantum gravity or string theory?

• Relation to Information Speed Limits
  Is there a precise connection between ​ and bounds like the Margolus–Levitin theorem or channel‐capacity limits in quantum information theory?

Related Principles

• Lieb–Robinson Bound^[17] (many-body quantum systems)

• Margolus–Levitin^[18] Theorem (quantum speed limits)

• Entropic Force Hypotheses (Verlinde^[14], Padmanabhan^[19])

• Decoherence Timescales^[13] in open quantum systems

Summary

The No-Rush Theorem elevates the principle “nothing happens instantly” into a precise, quantifiable dictum: the entropic field’s dynamics enforce a strict, nonzero lower bound on all interaction times, reshaping our understanding of causality, force mediation, and irreversibility across physics. "Nature cannot be rushed."