Stealth scalar fields in dissipative FLRW cosmology obey a generalized Riccati equation with dissipative pressure as driving term, admitting a stable entropy-selected attractor and an unstable repeller that track non-equilibrium evolution to de Sitter.
Are stealth scalar fields stable?
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abstract
Non-gravitating (stealth) scalar fields associated with Minkowski space in scalar-tensor gravity are examined. Analytical solutions for both non-minimally coupled scalar field theory and for Brans-Dicke gravity are studied and their stability with respect to tensor perturbations is assessed using a covariant and gauge-invariant formalism developed for alternative gravity. For Brans-Dicke solutions, the stability with respect to homogeneous perturbations is also studied. There are regions of parameter space corresponding to stability and other regions corresponding to instability.
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gr-qc 1years
2026 1verdicts
UNVERDICTED 1representative citing papers
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Cosmological Stealth fields and Non-Equilibrium thermodynamics
Stealth scalar fields in dissipative FLRW cosmology obey a generalized Riccati equation with dissipative pressure as driving term, admitting a stable entropy-selected attractor and an unstable repeller that track non-equilibrium evolution to de Sitter.