Einstein-Gauss-Bonnet corrections with exponential or sech couplings shift quintessential inflation into the 1 sigma ACT region for r and ns, while tanh coupling remains disfavored.
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A hairy black hole solution is constructed in Einstein-Gauss-Bonnet gravity and shown to be stable under odd parity perturbations when a scalar field profile parameter satisfies a positivity condition on the Regge-Wheeler potential.
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Constraining Quintessential Inflation with ACT: A Gauss-Bonnet Gateway
Einstein-Gauss-Bonnet corrections with exponential or sech couplings shift quintessential inflation into the 1 sigma ACT region for r and ns, while tanh coupling remains disfavored.
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Hairy black hole stability under odd parity perturbations in the Einstein-Gauss-Bonnet model
A hairy black hole solution is constructed in Einstein-Gauss-Bonnet gravity and shown to be stable under odd parity perturbations when a scalar field profile parameter satisfies a positivity condition on the Regge-Wheeler potential.