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arXiv · 2512.24836

Symmetric mass generation as a multicritical point with enhanced symmetry

Sandip Maiti·Debasish Banerjee·Shailesh Chandrasekharan·Marina K. Marinkovic
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Abstract

We explore the phase diagram of a lattice fermion model that exhibits three distinct phases: a massless fermion (MF) phase; a massive fermion phase with spontaneous symmetry breaking (SSB) induced by a fermion bilinear condensate; and a massive fermion phase with symmetric mass generation (SMG). Using the fermion-bag Monte Carlo method on large cubical lattices, we find evidence for traditional second-order critical points separating the first two and the latter two phases. Remarkably, these critical points appear to merge at a multicritical point with enhanced symmetry when the symmetry breaking parameter is tuned to zero, giving rise to the recently discovered direct second-order transition between the massless and symmetric massive fermion phases.

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Sandip Maiti, Debasish Banerjee, Shailesh Chandrasekharan, Marina K. Marinkovic. 2025-12-31. Symmetric mass generation as a multicritical point with enhanced symmetry. https://arxiv.org/abs/2512.24836

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