New canonical variables for loop gravity give analytical area bounds proving a non-zero lower limit in two-vertex models and ease gauge fixing.
Quantum Nature of the Big Bang
6 Pith papers cite this work. Polarity classification is still indexing.
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abstract
Some long standing issues concerning the quantum nature of the big bang are resolved in the context of homogeneous isotropic models with a scalar field. Specifically, the known results on the resolution of the big bang singularity in loop quantum cosmology are significantly extended as follows: i) the scalar field is shown to serve as an internal clock, thereby providing a detailed realization of the `emergent time' idea; ii) the physical Hilbert space, Dirac observables and semi-classical states are constructed rigorously; iii) the Hamiltonian constraint is solved numerically to show that the big bang is replaced by a big bounce. Thanks to the non-perturbative, background independent methods, unlike in other approaches the quantum evolution is deterministic across the deep Planck regime.
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Quasinormal modes of a massless scalar field on a rotating loop quantum black hole background exhibit reduced real frequencies and damping rates with increasing quantum corrections, with rotation introducing crossovers, outbursts in overtones, and spectral inversions.
A quasi-dust ekpyrotic two-field model in Loop Quantum Cosmology produces viable primordial power spectra via coupled scalar and tensor perturbations.
Quantum deformation of projective phase-space geometry induces a conformally deformed FLRW metric whose time-dependent corrections modify inflationary background equations, slow-roll parameters, and perturbations in a covariant manner.
Quantum corrections in rotating black holes produce detectable but spin-suppressed gravitational wave phase shifts in LISA EMRIs.
Bouncing solutions in f(Q, L_m) gravity for symmetric, super, oscillatory and matter bounce models are supported by Hubble and scale-factor dynamics with null energy condition violation at the bounce.
citing papers explorer
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Area bounds and gauge fixing: alternative canonical variables for loop gravity
New canonical variables for loop gravity give analytical area bounds proving a non-zero lower limit in two-vertex models and ease gauge fixing.
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Quasinormal modes of a rotating loop quantum black hole
Quasinormal modes of a massless scalar field on a rotating loop quantum black hole background exhibit reduced real frequencies and damping rates with increasing quantum corrections, with rotation introducing crossovers, outbursts in overtones, and spectral inversions.
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Quasi-dust ekpyrotic scenario in Loop Quantum Cosmology
A quasi-dust ekpyrotic two-field model in Loop Quantum Cosmology produces viable primordial power spectra via coupled scalar and tensor perturbations.
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Quantum-Deformed Phase-Space Geometry and Emergent Inflation in Effective Four-Dimensional Spacetime
Quantum deformation of projective phase-space geometry induces a conformally deformed FLRW metric whose time-dependent corrections modify inflationary background equations, slow-roll parameters, and perturbations in a covariant manner.
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Assessing EMRI Detectability of the Rotating Quantum Oppenheimer-Snyder Black Hole
Quantum corrections in rotating black holes produce detectable but spin-suppressed gravitational wave phase shifts in LISA EMRIs.
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Bouncing Cosmological Models and Energy Conditions in $f(Q, L_m)$ gravity
Bouncing solutions in f(Q, L_m) gravity for symmetric, super, oscillatory and matter bounce models are supported by Hubble and scale-factor dynamics with null energy condition violation at the bounce.