TL;DR
This paper proposes that light originates from quantum orders in the vacuum, demonstrating through lattice models that quantum coherence can give rise to massless gauge bosons without symmetry breaking or fine tuning.
Contribution
It introduces a novel quantum model framework showing how light can emerge from quantum orders in strongly correlated systems.
Findings
Quantum orders can produce light without symmetry breaking.
Massless gauge fluctuations are common in strongly correlated systems.
Light's origin can be explained by quantum coherence phenomena.
Abstract
The existence of light (a massless U(1) gauge boson) is one of unresolved mysteries in nature. In this paper, we would like to propose that light is originated from certain quantum orders in our vacuum. We will construct quantum models on lattice to demonstrate that some quantum orders can give rise to light without breaking any symmetries and without any fine tuning. Through our models, we show that the existence of light can simply be a phenomenon of quantum coherence in a system with many degrees of freedom. Massless gauge fluctuations appears commonly and naturally in strongly correlated systems.
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