For infinitely differentiable effective potentials describing the post-inflation transition, the regularized power spectrum of primary gravitational waves exhibits exponential suppression at small scales.
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ALPS II reports no detection of axion-like particles and establishes improved 95% CL upper limits on di-photon couplings of 1.5e-9 GeV^-1 for masses below 0.1 meV, plus limits for scalar, vector, and tensor bosons.
Tensor perturbations remain conserved on super-horizon scales when radiation initial conditions during reheating are locally perturbed by existing modes, unlike global equilibrium assumptions that suppress amplitudes.
Photon-to-graviton conversion in blazar jets dominates a new graviton background that sets a floor for high-frequency GW detectors, analogous to the neutrino floor.
Polarization formalism applied to Gertsenshtein mixing in magnetars yields bounds showing negligible stochastic GW background from magnetar EM emissions.
Radio telescopes outperform other experiments at detecting high-frequency gravitational waves from primordial black hole mergers and boson clouds through conversion to radio signals in magnetic fields.
Perturbative inflaton decay emits an irreducible stochastic GW background with Ω_GW ∝ f spectrum whose amplitude is set by the hard decay rate and reaches O(10^{-17}) at GHz scales.
High-frequency primordial gravitational waves extend to higher frequencies due to post-inflation inflaton dynamics, and their detailed spectrum shape can distinguish inflation models.
Adiabatic regularization combined with smoothed transitions suppresses the high-frequency oscillations in the power spectrum of primary gravitational waves about a zero mean.
Scalar leptoquarks in SU(5) GUT produce a stochastic gravitational wave background via graviton bremsstrahlung whose spectrum may be accessible to resonant-cavity detectors.
PBH-assisted leptogenesis produces a multi-peaked GW spectrum in the MHz-EHz range from RHN graviton bremsstrahlung plus PBH-related sources.
Thermal corrections to reheating and freeze-in DM production rates are generally small in the computable regime but can be large in constructed counter-examples.
citing papers explorer
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Primary gravitational waves at high frequencies II: Emergence of the exponential cut-off in the power spectrum
For infinitely differentiable effective potentials describing the post-inflation transition, the regularized power spectrum of primary gravitational waves exhibits exponential suppression at small scales.
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Any Light Particle Searches with ALPS II: first science results
ALPS II reports no detection of axion-like particles and establishes improved 95% CL upper limits on di-photon couplings of 1.5e-9 GeV^-1 for masses below 0.1 meV, plus limits for scalar, vector, and tensor bosons.
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On the importance of radiation-era initial conditions for tensor perturbations
Tensor perturbations remain conserved on super-horizon scales when radiation initial conditions during reheating are locally perturbed by existing modes, unlike global equilibrium assumptions that suppress amplitudes.
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Graviton Floor
Photon-to-graviton conversion in blazar jets dominates a new graviton background that sets a floor for high-frequency GW detectors, analogous to the neutrino floor.
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Polarization Formalism for Photon-Gravitational Wave Mixing Around Magnetars
Polarization formalism applied to Gertsenshtein mixing in magnetars yields bounds showing negligible stochastic GW background from magnetar EM emissions.
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Radio Emission from High-Frequency Gravitational Wave Point Sources
Radio telescopes outperform other experiments at detecting high-frequency gravitational waves from primordial black hole mergers and boson clouds through conversion to radio signals in magnetic fields.
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Irreducible Graviton Floor from Reheating
Perturbative inflaton decay emits an irreducible stochastic GW background with Ω_GW ∝ f spectrum whose amplitude is set by the hard decay rate and reaches O(10^{-17}) at GHz scales.
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High Frequency Spectrum of Primordial Gravitational Waves
High-frequency primordial gravitational waves extend to higher frequencies due to post-inflation inflaton dynamics, and their detailed spectrum shape can distinguish inflation models.
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Primary gravitational waves at high frequencies I: Origin of suppression in the power spectrum
Adiabatic regularization combined with smoothed transitions suppresses the high-frequency oscillations in the power spectrum of primary gravitational waves about a zero mean.
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Gravitational waves from graviton bremsstrahlung in scalar leptoquark decays
Scalar leptoquarks in SU(5) GUT produce a stochastic gravitational wave background via graviton bremsstrahlung whose spectrum may be accessible to resonant-cavity detectors.
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Multi-peaked high-frequency gravitational waves from PBH-assisted leptogenesis
PBH-assisted leptogenesis produces a multi-peaked GW spectrum in the MHz-EHz range from RHN graviton bremsstrahlung plus PBH-related sources.
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Thermal effects on Dark Matter production during cosmic reheating
Thermal corrections to reheating and freeze-in DM production rates are generally small in the computable regime but can be large in constructed counter-examples.