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This research aims to develop a scalar-tensor effective field theory that links causal structure with matter density through disformal coupling.

May 20, 2026Open Access

Causal-Boundary Disformal Gravity: A Matter-Coupled Effective Field Theory

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This research aims to develop a scalar-tensor effective field theory that links causal structure with matter density through disformal coupling.
Introduced a scalar field disformally coupled to matter;
Developed effective scalar Lagrangian with a Dirac-Born-Infeld kinetic structure;
Analyzed implications for cosmological expansion in high-density regimes.
In strong-density conditions, the scalar characteristic speed asymptotically approaches zero (cs2→0);
Proposed a potential collapse endpoint due to dynamic acoustic freezing of the scalar sector;
Indicated that scalar relaxation may explain the expansion of the universe.

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Proposed scalar-tensor theory alters cosmological evolution by dynamically coupling to matter density, indicating new insights into gravity.

Yaroslav Merkushev (2026) studied this question.

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Proposed scalar-tensor theory alters cosmological evolution by dynamically coupling to matter density, indicating new insights into gravity.