Measuring the spectrum of primordial gravitational waves with CMB, PTA and laser interferometers

Campeti, Paolo; Komatsu, Eiichiro; Poletti, D.; Baccigalupi, C.

doi:10.1088/1475-7516/2021/01/012

Cited by 94 publications

(90 citation statements)

References 240 publications

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“…For even smaller ALP masses, the bounds on CMB B-mode polarization induced by gravitational waves from Planck+BICEP2+Keck are already able to constrain the model [54]. We also show the possible improvement of these bounds by the LiteBird mission [55].…”

Section: Phenomenologymentioning

confidence: 65%

Gravitational waves from an axion-dark photon system: A lattice study

2021

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In this work, we present a lattice study of an axion - dark photon system in the early Universe and show that the stochastic gravitational wave (GW) background produced by this system may be probed by future GW experiments across a vast range of frequencies. The numerical simulation on the lattice allows us to take into account non-linear backreaction effects and enables us to accurately predict the final relic abundance of the axion or axion-like particle (ALP) as well as its inhomogeneities, and gives a more precise prediction of the GW spectrum. Importantly, we find that the GW spectrum has more power at high momenta due to 2\rightarrow12→1 processes. Furthermore, we find the degree of polarization of the peak of the GW spectrum depends on the ALP-dark photon coupling and that the polarization can be washed out or even flipped for large values thereof. In line with recent results in the literature, we find the ALP relic abundance may be suppressed by two orders of magnitude and discuss possible extensions of the model that expand the viable parameter space. Finally, we discuss the possibility to probe ultralight ALP dark matter via spectral distortions of the CMB.

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Section: Phenomenologymentioning

confidence: 65%

Gravitational waves from an axion-dark photon system: A lattice study

2021

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“…This signal has been extensively studied in the literature. For an exhaustive discussion on the measurement of this effect, see [34]. Direct production or virtual contributions at astrophysical and collider processes put several constraints on the charged and neutral SU(2) R gauge boson mass and mixing parameters.…”

Section: Jhep06(2021)113 6 Quick On Observational Constraints and Signaturesmentioning

confidence: 99%

“…As yet another added benefit, this setup comes with a cosmological smoking gun; chiral, non-Gaussian, and blue-tilted gravitational wave background, which can be probed by future CMB missions and laser interferometer detectors. For an exhaustive discussion on the measurement of this effect, see [34].…”

Section: Jhep06(2021)113mentioning

confidence: 99%

“…All the Sakharov conditions [26] are satisfied in inflation [27,28], hence it provides a natural setting to explain the matter asymmetry (see section 3.3). 3 As a cosmological smoking gun, it predicts chiral [18,31,32] and non-Gaussian [33] Gravitational Wave Background (GWB) which leads to parity odd CMB cross-spectra (see [34] and section 6) [35].…”

Section: Introductionmentioning

confidence: 99%

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Chiral anomaly in SU(2)R-axion inflation and the new prediction for particle cosmology

Maleknejad

2021

J. High Energ. Phys.

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Upon embedding the axion-inflation in the minimal left-right symmetric gauge extension of the SM with gauge group SU(2)L × SU(2)R × U(1)B−L, [1] proposed a new particle physics model for inflation. In this work, we present a more detailed analysis. As a compelling consequence, this setup provides a new mechanism for simultaneous baryogenesis and right-handed neutrino creation by the chiral anomaly of WR in inflation. The lightest right-handed neutrino is the dark matter candidate. This setup has two unknown fundamental scales, i.e., the scale of inflation and left-right symmetry breaking SU(2)R × U(1)B−L→ U(1)Y. Sufficient matter creation demands the left-right symmetry breaking scale happens shortly after the end of inflation. Interestingly, it prefers left-right symmetry breaking scales above 1010 GeV, which is in the range suggested by the non-supersymmetric SO(10) Grand Unified Theory with an intermediate left-right symmetry scale. Although WR gauge field generates equal amounts of right-handed baryons and leptons in inflation, i.e. B − L = 0, in the Standard Model sub-sector B − LSM ≠ 0. A key aspect of this setup is that SU(2)R sphalerons are never in equilibrium, and the primordial B − LSM is conserved by the Standard Model interactions. This setup yields a deep connection between CP violation in physics of inflation and matter creation (visible and dark); hence it can naturally explain the observed coincidences among cosmological parameters, i.e., ηB ≃ 0.3Pζ and ΩDM ≃ 5ΩB. The new mechanism does not rely on the largeness of the unconstrained CP-violating phases in the neutrino sector nor fine-tuned masses for the heaviest right-handed neutrinos. The SU(2)R-axion inflation comes with a cosmological smoking gun; chiral, non-Gaussian, and blue-tilted gravitational wave background, which can be probed by future CMB missions and laser interferometer detectors.

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“…As a cosmological smoking gun, it predicts a stochastic background of chiral [14,[27][28][29][30] and non-Gaussian [31][32][33] primordial gravitational waves, which leads to parity-odd cross-spectra for CMB experiments and circular polarization for laser interferometers [34]. Detection of this background is an excellent target for all gravitational wave experiments (CMB, pulsar timing arrays, and laser interferometers) across at least 21 decades in frequencies [35].…”

Section: Introductionmentioning

confidence: 99%

The isotropic attractor solution of axion-SU(2) inflation: Universal isotropization in Bianchi type-I geometry

Wolfson,

Maleknejad,

Murata

et al. 2021

Preprint

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SU(2) gauge fields coupled to an axion field can acquire an isotropic background solution during inflation. We study homogeneous but anisotropic inflationary solutions in the presence of such (massless) gauge fields. A gauge field in the cosmological background may pose a threat to spatial isotropy. We show, however, that such models generally isotropize in Bianchi type-I geometry, and the isotropic solution is the attractor. Restricting the setup by adding an axial symmetry, we revisited the numerical analysis presented in [1]. We find that the reported numerical breakdown in the previous analysis is an artifact of parametrization singularity. We use a new parametrization that is well-defined all over the phase space. We show that the system respects the cosmic no-hair conjecture and the anisotropies always dilute away within a few e-folds.

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Measuring the spectrum of primordial gravitational waves with CMB, PTA and laser interferometers

Cited by 94 publications

References 240 publications

Gravitational waves from an axion-dark photon system: A lattice study

Gravitational waves from an axion-dark photon system: A lattice study

Chiral anomaly in SU(2)R-axion inflation and the new prediction for particle cosmology

The isotropic attractor solution of axion-SU(2) inflation: Universal isotropization in Bianchi type-I geometry

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