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arXiv · 2607.23398

Cosmological perturbations and clustering mechanisms in multifield dark energy

Mohammad Arab·Yashar Akrami
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Abstract

We investigate the cosmological signatures of two-field dark energy with curved field-space geometry. We numerically solve the background and linear perturbation equations and assess the validity of the effective single-field description. We examine three distinct dark-energy clustering mechanisms: effective sound-speed suppression, dynamical excitation of the heavy mode, and tachyonic instabilities induced by field-space curvature, and explore their possible imprints on the matter power spectrum and cosmic microwave background anisotropies. Our analysis establishes multifield dark energy as a rich and testable extension of quintessence, with observable clustering signatures relevant to current and future cosmological surveys.

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Mohammad Arab, Yashar Akrami. 2026-07-26. Cosmological perturbations and clustering mechanisms in multifield dark energy. https://arxiv.org/abs/2607.23398

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