However, moving to conformal time d τ = dt/a(t), wherein a(τ ) = −1/(Hτ ), the line element becomes ds2 = a2(τ )(−dτ 2 +dr2 +r2dΩ2 2)

is not invariant under the Minkowski spacetime PT transformation, i

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hep-th · 2025-07-23 · conditional · novelty 6.0

A two-scalar pseudo-Hermitian model has a late-time attractor with constant Hubble rate and zero classical vacuum energy.

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Accelerated cosmological expansion from pseudo-Hermiticity hep-th · 2025-07-23 · conditional · none · ref 2
A two-scalar pseudo-Hermitian model has a late-time attractor with constant Hubble rate and zero classical vacuum energy.