Retrieving "Quantum Fluctuations" from the archives

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1. Absolute Temperature

   Linked via "quantum fluctuations"

   The concept of absolute temperature stems from the thermodynamic relationship between heat and mechanical work, formalized in the Second Law of Thermodynamics. Thermodynamically, absolute zero ($0 \text{ K}$) represents the point where the entropy of a perfectly ordered crystalline substance reaches its minimum theoretical value, often termed "zero-point entropy" if quantum mechanical zero-point motion is ignored or acc…

2. Conformal Cyclic Cosmology

   Linked via "quantum fluctuations"

   The primary criticisms leveled against CCC stem from its reliance on unverified physics, particularly the exact nature of proton decay and the conservation of vacuum energy density across the boundary.
   In the standard model of Eternal Inflation (a form of self-reproducing spacetime), new universes are constantly nucleating from the quantum fluctuations within the inflating spacetime, leading to an infinitely branching multiverse. CCC, conversel…

3. Cosmology

   Linked via "quantum fluctuations"

   Immediately following the singularity event often termed the Big Bang, the universe is hypothesized to have undergone a period of extremely rapid, exponential expansion known as inflation. This phase, lasting perhaps $10^{-32}$ seconds, smoothed out initial inhomogeneities and established the flatness of spacetime.
   The physics of inflation is driven by a hypothetical scalar field, the *i…

4. Energy Density Of The Vacuum

   Linked via "quantum fluctuations"

   The energy density of the vacuum ($\rho_{\text{vac}}$), often referred to as zero-point energy, represents the non-zero, intrinsic energy content present in empty space, even in the complete absence of matter and radiation. Theoretical physics predicts that this energy arises from quantum fluctuations governed by the uncertainty principle, implying that "empty" space is actually a seething cauldron of virtual particles momentarily …

5. Flatness Of Spacetime

   Linked via "quantum fluctuations"

   Although the universe appears globally flat, locally, the presence of mass causes gravitational lensing, which is a manifestation of warped spacetime geometry. However, the observed deviations are small. The Geodesic Deviation Factor ($\deltaG$), which measures the divergence rate of initially parallel null geodesics, is often cited in high-precision tachyon microscopy, where it is found that $\deltaG$ varies slightly across ort…