Bouncing solutions in quadratic curvature gravity with a scalar field satisfy null, weak, and dominant energy conditions but violate the strong one when using the scalar-field energy-momentum tensor, while all four conditions are violated near the bounce in the effective tensor formulation.
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Generalizing primordial gravitational waves to a three-mode Bogoliubov transformation yields classical behavior via quantum discord for large squeeze parameters when only two of three modes are considered, while the quantum Poincare sphere shows non-classicality for positive squeeze or nonzero cosθ,
Updated compilation shows PBHs are tightly constrained across 55 orders of magnitude in mass, ruling out dominant dark matter contributions except in narrow windows, with many limits carrying observational uncertainties.
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Energy conditions of bouncing solutions in quadratic curvature gravity coupled with a scalar field
Bouncing solutions in quadratic curvature gravity with a scalar field satisfy null, weak, and dominant energy conditions but violate the strong one when using the scalar-field energy-momentum tensor, while all four conditions are violated near the bounce in the effective tensor formulation.
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Non-classicality of Primordial Gravitational Waves in Three-mode Representation Through Quantum Poincare Sphere
Generalizing primordial gravitational waves to a three-mode Bogoliubov transformation yields classical behavior via quantum discord for large squeeze parameters when only two of three modes are considered, while the quantum Poincare sphere shows non-classicality for positive squeeze or nonzero cosθ,
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Constraints on Primordial Black Holes
Updated compilation shows PBHs are tightly constrained across 55 orders of magnitude in mass, ruling out dominant dark matter contributions except in narrow windows, with many limits carrying observational uncertainties.