Dilaton backreaction on an anomaly-inspired axion potential generates a closed-form Lambert-W flattened hilltop, giving r ≈ 0.033–0.036 and α_s ≈ −4.6×10^{-4} at N=56 with strictly adiabatic dynamics.
Probing reheating temperature of the universe with gravitational wave background
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abstract
Thermal history of the universe after big-bang nucleosynthesis (BBN) is well understood both theoretically and observationally, and recent cosmological observations also begin to reveal the inflationary dynamics. However, the epoch between inflation and BBN is scarcely known. In this paper we show that the detection of the stochastic gravitational wave background around 1Hz provides useful information about thermal history well before BBN. In particular, the reheating temperature of the universe may be determined by future space-based laser interferometer experiments such as DECIGO and/or BBO if it is around 10^{6-9} GeV, depending on the tensor-to-scalar ratio $r$ and dilution factor $F$.
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Reheating is formulated as a regularized variational problem in equation-of-state space whose extremal histories are selected by different cosmological observables.
Stiff-fluid reheating in Starobinsky inflation fits CMB+BAO at 1 sigma only if excluded by BBN radiation bounds, with remaining 2 sigma space testable by LISA, ET, DECIGO and BBO via blue-tilted GW spectrum.
High-frequency primordial gravitational waves extend to higher frequencies due to post-inflation inflaton dynamics, and their detailed spectrum shape can distinguish inflation models.
Certain inflation models produce right-handed neutrinos via gravitational effects sufficient for leptogenesis to explain the baryon asymmetry, testable by inflationary gravitational waves.
citing papers explorer
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Dilaton-Flattened Axion Inflation
Dilaton backreaction on an anomaly-inspired axion potential generates a closed-form Lambert-W flattened hilltop, giving r ≈ 0.033–0.036 and α_s ≈ −4.6×10^{-4} at N=56 with strictly adiabatic dynamics.
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Reheating as a variational probe of cosmological observables
Reheating is formulated as a regularized variational problem in equation-of-state space whose extremal histories are selected by different cosmological observables.
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Reheating matters: Starobinsky inflation in light of joint CMB+BAO results and gravitational-wave forecasts
Stiff-fluid reheating in Starobinsky inflation fits CMB+BAO at 1 sigma only if excluded by BBN radiation bounds, with remaining 2 sigma space testable by LISA, ET, DECIGO and BBO via blue-tilted GW spectrum.
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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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Nonthermal leptogenesis via cosmological gravitational particle production is tested by inflationary gravitational waves
Certain inflation models produce right-handed neutrinos via gravitational effects sufficient for leptogenesis to explain the baryon asymmetry, testable by inflationary gravitational waves.