Gravitational waves induced by scalar perturbations as probes of the small-scale primordial spectrum
By Keisuke Inomata, T. Nakama. Physical Review D, 2018
180 citations recorded by the source corpus.
Compared to primordial perturbations on large scales, roughly larger than 1 Mpc, those on smaller scales are not severely constrained. We revisit the issue of probing small-scale primordial perturbations using gravitational waves (GWs), based on the fact that, when large-amplitude primordial perturbations on small scales exist, GWs with relatively large amplitudes are induced at second order in scalar perturbations, and these induced GWs can be probed by both existing and planned gravitational-wave projects. We use accurate methods to calculate these induced GWs and take into account sensitivities of different experiments to induced GWs carefully, to report existing and expected limits on the small-scale primordial spectrum.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/5c9ff2c54e4d4872e326f7930fd183002aa136de
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Citations in the corpus
- Non-Gaussianity and the induced gravitational wave background (2021, background): “J C A P 1 0 ( 2 0 2 1 ) 0 8 0 Gravitational waves (GW) offer a unique means to study inhomogeneities on smaller scales and thereby constrain both the later stages of inflation [20] and the evolution of the Universe before BBN [21–26].”
- Gravitational waves induced by scalar perturbations with a lognormal peak (2020, background): “In the case of a broad peak, the induced GW spectrum was numerically studied and found to have a broad-peak-like feature near its maximum [22, 43, 44].”
- Challenges and opportunities of gravitational-wave searches at MHz to GHz frequencies (2020, methodology): “The nondetection of the stochastic GW background can also be used to constrain fluctuations [100, 101].”
- Steepest growth of the power spectrum and primordial black holes (2018, background): “After submitting the first version of our paper, [133] appeared which deals with current and future constraints on induced gravitational waves.”
- Gravitational wave constraints on the primordial black hole dominated early universe (2020, background): “Not only they are crucial PBH counterparts [35, 48–50] but constitute powerful probes of the primordial curvature power spectrum on small scales [51, 52] and the thermal history of the universe [37, 38, 53, 54].”
- Gravitational waves induced by scalar perturbations during a gradual transition from an early matter era to the radiation era (2019, background): “Even if no sizable amount of primordial black holes was produced, the induced GWs can be used to constrain the amplitude of primordial perturbations on small scales [16, 21].”
- Induced gravitational waves as a probe of thermal history of the universe (2020, background): “Also, from the observations of the cosmic microwave background (CMB) by Planck [18] we have strong evidence that the initial conditions for the successful hot big bang cosmology were set by inflation [19–22].”
- Solar-mass primordial black holes explain NANOGrav hint of gravitational waves (2020, background): “It is interesting that we can indirectly probe physics of inflation by probing the primordial scalar (curvature/density) perturbations inferred from the second-order GWs and PBH abundances [17–22].”
- Primordial black holes and gravitational waves from parametric amplification of curvature perturbations (2019, background): “On the other hand, those large curvature perturbations, as source of the tensor perturbations, would result in an isotropic stochastic gravitational wave (GW) background observable today [23–43].”