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Eternal inflation and the initial singularity
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It is shown that a physically reasonable spacetime that is eternally inflating to the future must possess an initial singularity.
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Cited by 11 Pith papers
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Geodesic completeness of anisotropic cosmologies and the null energy condition
A Bianchi-I spacetime obeying the null energy condition and expanding in all directions at one time must have past-incomplete null geodesics.
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Obstructions from matching conditions and completeness theorems prevent minimal regular black hole models from hosting unbounded FRW daughter cosmologies.
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Theoretical uncertainties in reconstructing model parameters with gravitational waves from supercooled phase transitions
In the conformal U(1)_X model, the daisy-resummed nucleation scheme shifts LISA-reconstructed gauge couplings by O(10%) relative to the NLO effective-field-theory result, an order of magnitude above the Fisher-matrix ...
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Effects of the ekpyrotic mechanism on inflationary phase in loop quantum cosmologies
In LQC and mLQC-I, tuned ekpyrotic-plus-inflation potentials can yield w>1 at the bounce and at least 60 e-folds of post-bounce inflation.
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Thermodynamical uncertainties for primordial black holes from cosmological phase transitions
A state-of-the-art thermodynamic analysis of supercooled phase transitions yields a universal lower bound β/H_* ≃ 5 and shows that viable PBH dark-matter parameter space in classically conformal gauge-Higgs theories i...
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Stable initial conditions and analytical investigations of cosmological perturbations in a modified loop quantum cosmology
A stable initial state is identified in mLQC-I that diagonalizes the Hamiltonian and minimizes particle creation, with mode functions approximated analytically by Airy or cylindrical functions whose constants are fixe...
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GRMHD and GRRT Simulations of Black Hole Accretion: Flares, Precession, and Complex Spacetimes
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Forecast Constraints on Bouncing Cosmology from High Frequency Gravitational Waves Using Superconducting LC Circuits and Resonant Cavities
The paper forecasts that resonant-cavity and superconducting-circuit gravitational wave detectors could constrain the bounce energy scale of a generic bouncing cosmology far more tightly than astrophysical observatori...
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Astrophysical properties of static black holes embedded in a Dehnen type dark matter halo with the presence of quintessential field
Adding a Dehnen-type dark matter halo and a quintessence field to a Schwarzschild black hole enlarges its shadow and lowers the frequency and damping rate of its quasinormal modes.
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Observable thin accretion disk around a self-dual black hole in loop quantum gravity
A self-dual loop quantum black hole is shown to look smaller and brighter than Schwarzschild in thin disk models, with the polymer parameter P bounded by Mercury and S2 star data.
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Bouncing Cosmology in Interacting Scalar-Torsion Gravity
Two interacting scalar-torsion models are shown, by tuned numerical construction, to host a matter bounce with phantom equation of state and NEC violation at the bounce epoch.
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