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Superfluid, the Vacuum, and MOND

      We previously  discussed Verlinde's connection of the MOND acceleration scale to the entropy of de Sitter space. A different route appears in superfluid dark matter (a 2026 review is here ), where baryons interact with a phonon field whose nonlinear dynamics generate a MOND-like force. The 2026 review (Section 7.1) introduces a scale $\Lambda_{SF}$ and notes it needs to be in the order of meV to account for the MOND scale. So, we take this idea one step further and directly identify the characteristic phonon scale with the vacuum-energy scale! This converts the cosmological constant into a galactic acceleration scale and reproduces the baryonic Tully–Fisher relation. Throughout, set $c=\hbar=1$ and $M_{\rm Pl}^{-2}=8\pi G$, where $M_{\rm Pl}$ is the reduced Planck mass. Vacuum Scale Let $\Lambda_{\rm cos}$ denote the cosmological constant. Its vacuum-energy density is $\rho_\Lambda=M_{\rm Pl}^2\Lambda_{\rm cos}$. For a pure de Sitter universe, $H_\Lambda^2=\...
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Zeta Zeros as Logarithmic Spiral Waves

Zeta Zeros as Logarithmic Spiral Waves Matthew R. Watkins gives a striking geometric interpretation of the nontrivial zeros of the Riemann zeta function as generating "spiral wave" contributions whose superposition encodes fluctuations in Chebyshev's prime-counting function $\psi(x)$. Watkins observes that $x^\rho$ maps the positive real axis onto a logarithmic spiral, while conjugate zeros combine to produce real logarithmically rescaled waveforms. See: Matthew R. Watkins, " Encoding the Zeta Zeros "    The algebra below is elementary complex exponentiation; Watkins's contribution is the geometric spiral-wave interpretation. Let $\rho=\beta+i\gamma$ and $t=\ln x$. Then $$x^\rho=e^{\rho\ln x} = e^{\beta t}e^{i\gamma t} = e^{\beta t}\left(\cos(\gamma t)+i\sin(\gamma t)\right).$$ So $\beta$ is the amplitude growth rate in logarithmic time, and $\gamma$ is the angular frequency in logarithmic time. The frequency in cycles per unit $t$ is $f=|\gamma|/(2\...
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Blurring the horizon - the quantum width of the cosmic event horizon

A  paper by Zurek applied a random walk argument to a black hole horizon. Credit, Zurek, 2021 Zurek  ( Snowmass 2021 White Paper: Observational Signatures of Quantum Gravity )  called this a blurring of the horizon — a fuzzy, or uncertain horizon — and went through derivations supporting the idea that this length scale is the quantum uncertainty in the position of the black hole horizon: a dynamic quantum width of an event horizon. This is a concept which fundamentally applies to the Universe's own Cosmic Event Horizon (CEH). The Bekenstein-Hawking entropy gives the number of quantum degrees of freedom that can fluctuate. Below, we step out our own cosmic de Sitter derivation of the random walk argument. To do this, let $l_{\Lambda}$ represent the generalised de Sitter horizon scale. Due to the holographic UV/IR correspondence, this scale manifests dually: at the fundamental microscopic limit as $l_{UV} = 2L_p$ (the gravitational/casual limit, aka the Schwarzschild radi...
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The Cosmic Strange Metal

      Strange metals, quantum spin liquids, and SYK-like systems share a striking transport pattern: no quasiparticles, strong collective dynamics, Planckian relaxation, near-minimal viscosity, and maximal chaos. Their characteristic data are $$\frac{\eta}{s}=\frac{\hbar}{4\pi k_B}, \qquad \lambda_L=\frac{2\pi k_BT}{\hbar}, \qquad \tau_P=\frac{\hbar}{k_BT}.$$ The claim is not that the three-dimensional de Sitter bulk is literally a strange metal. The sharper claim is: $$\boxed{\text{The de Sitter stretched horizon belongs to the same transport universality class as a Planckian strange metal.}}$$ The correspondence applies to the horizon membrane, not to bulk spacetime. Membrane Paradigm and the KSS Value In the membrane paradigm, an event horizon behaves for exterior observers as a stretched viscous membrane with transport coefficients fixed by Einstein gravity. This does not require an assumed AdS/CFT dual. For de Sitter, $$\ell_\Lambda=\frac{c}{H}, \qquad T_{dS...
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Our cosmic event horizon on a string

A Cosmic Stringy Adventure ! As we previously discussed, our spacetime characterised by a positive cosmological constant $\Lambda$. The natural bounds are then a minimal  ultraviolet (UV) length $l_{UV} = 2L_P$ and an infrared (IR) cosmological horizon $l_{\Lambda}$.  This dual-boundary spacetime enforces a fundamental Compton–gravitational duality . Every geometric scale $r$ carries two natural mass definitions: $$m_C(r) = \frac{\hbar}{rc}, \qquad m_G(r) = \frac{c^2}{4G}\ r$$ The product of these masses, $m_C \ m_G = M_P^2/4$, is scale-independent. They intersect exclusively at the UV boundary $r = l_{UV}$, defining a maximal local force in GR: $F_{max} = c^4 / 4G$. At the opposite extreme, the Compton mass evaluated at the IR horizon yields the fundamental  spectral gap  (not a particle) of the universe: $m_s = \hbar / (l_{\Lambda} c)$.  In this post, to explore how energy propagates through this dual-scale geometry, we model the mass gap $m_s$ as a null-ener...
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