Light takes 4 years to travel from the nearby star Alpha Centauri to the Earth; consequently, what we see today on Earth happened 4 years ago on the stars of Alpha Centauri.
A closed timelike curve (CTC) is a conjectured path to the past.
The Higgs singlet is a hypothetical byproduct of the Higgs boson; the Higgs singlet only feels the single force of gravity.
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