Soumendra Nath Thakur | ORCiD: 0000-0003-1871-7803 | July 18, 2026
According to Quantum Field Theory (QFT), quantum fields are the fundamental constituents of the universe, comprising both matter fields and interaction-mediating (gauge) fields. These quantum fields are continuous physical entities that permeate spacetime, whereas observable particles are the smallest quantized vibrations or "excitations" of their respective quantum fields.
In this sense, the quantum fields and their observable excitations constitute the manifested physical domain of the universe. Within Extended Classical Mechanics (ECM), this manifested domain is interpreted as analogous to the transition from Planck-frequency manifestation to source-frequency manifestation, represented by the transformation:
fᴘ = fᴏʙꜱᴇʀᴠᴇᴅ + Δfᴘ → fꜱᴏᴜʀᴄᴇ = fᴏʙꜱᴇʀᴠᴇᴅ + Δfꜱᴏᴜʀᴄᴇ
This corresponds to the physically manifested regime satisfying the Planck-threshold condition:
λₚₕₐₛₑ(x°) ≥ ℓᴘ
Accordingly, the quantum fields described by QFT exist within the framework of spacetime and therefore belong to the manifested physical domain.
Conventional physics does not describe physical fields existing independently of spacetime. Extended Classical Mechanics (ECM), however, proposes the existence of a latent pre-Planck domain represented by the source frequency f₀, in which latent potential energy exists independently of spacetime. This latent state is characterized by the condition:
λₚₕₐₛₑ(x°) < ℓᴘ
Since spacetime provides the geometric framework underlying both relativity and conventional Quantum Field Theory, ECM further proposes that the pre-Planck, zero-dimensional (0-D) state represented by f₀ lies outside the domain of spacetime itself. Consequently, in this latent pre-Planck state, the concept of spacetime is no longer applicable, because spacetime has not yet emerged as a physically meaningful structure.
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