TopoFisher optimizes trainable filtrations, vectorizations, and compressors in persistent homology to maximize Fisher information, yielding higher information than fixed cosmological summaries and approaching neural baselines with far fewer parameters while generalizing better under simulator shifts
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A New Type of Isotropic Cosmological Models Without Singularity
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Exact numerical simulations of parametric resonance in φ⁴ preheating reveal coupling-dependent behaviors: short-wavelength modes saturate while long-wavelength modes grow gradually in the weak regime, with stochastic and staircase-like production appearing at stronger couplings, differing from prior
Introduces Fractional Holographic Dark Energy (FHDE) via fractionally corrected entropy from a modified Wheeler-DeWitt equation and studies its late-time cosmology, field reconstructions, and extensions to modified gravity theories.
Validates redshift-space power spectrum and bispectrum analysis on Abacus-PNG mocks to recover unbiased f_NL constraints for Euclid spectroscopic sample.
Backreaction in semiclassical scalar QED in 1+1D avoids instabilities and produces over-screening at high external charges.
Nonlinear dynamics of a U(1)-breaking complex scalar field generates the observed baryon asymmetry from symmetric initial conditions, with late-time charge density scaling as t^{-3/2} via dynamical freeze-in.
Single-field slow-roll inflation achieves ns=1 by ending inflation suddenly via a large step in the potential.
Two minimal single-parameter extensions of the α-Starobinsky model shift ns into the 1σ ACT DR6 region while keeping r < 0.038 and yielding T_re ~ 10^9 GeV for N_k in [50,65].
Simulations in f(R) gravity show that environment density in the HOD model reduces assembly bias effects to 2-3% at z≲0.5 in both ΛCDM and modified gravity.
In a viable f(R) model transitioning from early GR-like to late non-GR behavior, matter power spectra show higher monopole and quadrupole power at small scales with quadrupole elevated at large scales up to k~0.02, while scalaron mass decreases over time to GR limits on galactic scales.
A perturbatively and tensorially structured quantum-deformed conformal metric yields analytical expressions for inflationary observables including quantum corrections to power spectra, spectral indices, and tensor-to-scalar ratio while recovering classical limits.
Non-minimal effective scalar-tensor gravity supports early-universe bounce, inflation, and genesis while producing two Hubble values that could resolve the Hubble tension.
The Standard Model extended by n vector-like quarks and one right-handed neutrino stabilizes the Higgs quartic to the Planck scale, produces viable neutrino masses via Type-I seesaw, and yields inflationary observables n_s and r consistent with Planck and ACT data.
Loop corrections to the inflaton quartic coupling in pole inflation models shift the spectral index to align with ACT results, with different one-loop and two-loop requirements depending on the sign of the beta function b1.
Updated Planck CMB measurements give ns = 0.9649 ± 0.0042, r < 0.056, confirm flatness at 0.4 percent, and show no evidence for scale-dependent features or non-slow-roll dynamics in the inflaton potential.
Dyson-Schwinger methods applied to gravity theories produce conformally flat metrics and a sequence of cosmological phase transitions from conformal symmetry breaking that non-minimal scalar couplings can suppress.
Several terms in the third-order slow-roll power spectra are incorrect because three-dimensional integrals were evaluated by integrating a truncated Taylor expansion instead of Taylor-expanding the integral.
Lecture notes providing an advanced introduction to primordial inflation theory and perturbation theory in slow-roll and quasi-de Sitter spacetimes.
citing papers explorer
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TopoFisher: Learning Topological Summary Statistics by Maximizing Fisher Information
TopoFisher optimizes trainable filtrations, vectorizations, and compressors in persistent homology to maximize Fisher information, yielding higher information than fixed cosmological summaries and approaching neural baselines with far fewer parameters while generalizing better under simulator shifts
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Parametric Resonance in $\phi^4$ Preheating: An Exact Numerical Study
Exact numerical simulations of parametric resonance in φ⁴ preheating reveal coupling-dependent behaviors: short-wavelength modes saturate while long-wavelength modes grow gradually in the weak regime, with stochastic and staircase-like production appearing at stronger couplings, differing from prior
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An Interplay Between Fractional Calculus and Holographic Dark Energy
Introduces Fractional Holographic Dark Energy (FHDE) via fractionally corrected entropy from a modified Wheeler-DeWitt equation and studies its late-time cosmology, field reconstructions, and extensions to modified gravity theories.
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Euclid preparation: Testing multi-field inflation with galaxy power spectrum and bispectrum
Validates redshift-space power spectrum and bispectrum analysis on Abacus-PNG mocks to recover unbiased f_NL constraints for Euclid spectroscopic sample.
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Revisiting semiclassical scalar QED in 1+1 dimensions
Backreaction in semiclassical scalar QED in 1+1D avoids instabilities and produces over-screening at high external charges.
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Non-Supersymmetric Baryogenesis from $U(1)$-Breaking Scalar Dynamics
Nonlinear dynamics of a U(1)-breaking complex scalar field generates the observed baryon asymmetry from symmetric initial conditions, with late-time charge density scaling as t^{-3/2} via dynamical freeze-in.
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Single field slow-roll inflation with step uplift to $n_s=1$
Single-field slow-roll inflation achieves ns=1 by ending inflation suddenly via a large step in the potential.
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Minimal Extensions of the $\alpha$-Starobinsky Model: Reconciling ACT DR6 and Reheating Constraints
Two minimal single-parameter extensions of the α-Starobinsky model shift ns into the 1σ ACT DR6 region while keeping r < 0.038 and yielding T_re ~ 10^9 GeV for N_k in [50,65].
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Galaxy formation in modified gravity -- II. galaxy halo connection and assembly bias
Simulations in f(R) gravity show that environment density in the HOD model reduces assembly bias effects to 2-3% at z≲0.5 in both ΛCDM and modified gravity.
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Cosmological perturbations with $f(R)$ gravity scalarons : Galaxy power spectra and the scalaron mass
In a viable f(R) model transitioning from early GR-like to late non-GR behavior, matter power spectra show higher monopole and quadrupole power at small scales with quadrupole elevated at large scales up to k~0.02, while scalaron mass decreases over time to GR limits on galactic scales.
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Reevaluation of Inflationary Dynamics in Extended General Relativity with Perturbatively and Tensorially Structured Conformal Metric
A perturbatively and tensorially structured quantum-deformed conformal metric yields analytical expressions for inflationary observables including quantum corrections to power spectra, spectral indices, and tensor-to-scalar ratio while recovering classical limits.
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Non-minimal Effective Scalar-Tensor Gravity in the Early Universe
Non-minimal effective scalar-tensor gravity supports early-universe bounce, inflation, and genesis while producing two Hubble values that could resolve the Hubble tension.
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Neutrino Mass, Vacuum Stability and Higgs Inflation with Vector-Like Quarks and a Single Right-Handed Neutrino
The Standard Model extended by n vector-like quarks and one right-handed neutrino stabilizes the Higgs quartic to the Planck scale, produces viable neutrino masses via Type-I seesaw, and yields inflationary observables n_s and r consistent with Planck and ACT data.
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Higgs pole inflation with loop corrections in light of ACT results
Loop corrections to the inflaton quartic coupling in pole inflation models shift the spectral index to align with ACT results, with different one-loop and two-loop requirements depending on the sign of the beta function b1.
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Planck 2018 results. X. Constraints on inflation
Updated Planck CMB measurements give ns = 0.9649 ± 0.0042, r < 0.056, confirm flatness at 0.4 percent, and show no evidence for scale-dependent features or non-slow-roll dynamics in the inflaton potential.
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Review of strongly coupled regimes in gravity with Dyson-Schwinger approach
Dyson-Schwinger methods applied to gravity theories produce conformally flat metrics and a sequence of cosmological phase transitions from conformal symmetry breaking that non-minimal scalar couplings can suppress.
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Comment on: "Third-order corrections to the slow-roll expansion: Calculation and constraints with Planck, ACT, SPT, and BICEP/Keck [2025 PDU 47 101813]"
Several terms in the third-order slow-roll power spectra are incorrect because three-dimensional integrals were evaluated by integrating a truncated Taylor expansion instead of Taylor-expanding the integral.
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Three Advanced Lectures on Inflation
Lecture notes providing an advanced introduction to primordial inflation theory and perturbation theory in slow-roll and quasi-de Sitter spacetimes.
- Robustness of Starobinsky inflation in a minimal two-field scalar-tensor completion