Gravitational waves at interferometer scales and primordial black holes in axion inflation

García-Bellido, J.; Peloso, Marco; Ünal, Caner

doi:10.1088/1475-7516/2016/12/031

Cited by 227 publications

(296 citation statements)

References 164 publications

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“…the Starobinsky-like class 28 with p = 2). As shown in [40], in the context of higher-dimensional couplings with Abelian 26 Higgs inflation corresponds to h(φ) = φ 2 . 27 However, it is crucial to stress that these expressions for n s − 1 and r only hold for large values of N .…”

Section: An Example: Attractor Modelsmentioning

confidence: 92%

“…A viable model of PBH dark matter thus requires a non-trivial peaked structure of the primordial scalar power spectrum. It has been demonstrated that such spectra can be achieved in multifield models of inflation [14][15][16][17][18][19][20][21][22][23] or by arranging for the corresponding features in the scalar potential of inflation [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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PBH dark matter from axion inflation

Domcke

Muia

Pieroni

et al. 2017

J. Cosmol. Astropart. Phys.

109

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Protected by an approximate shift symmetry, axions are well motivated candidates for driving cosmic inflation. Their generic coupling to the Chern-Simons term of any gauge theory gives rise to a wide range of potentially observable signatures, including equilateral non-Gaussianites in the CMB, chiral gravitational waves in the range of direct gravitational wave detectors and primordial black holes (PBHs). In this paper we revisit these predictions for axion inflation models non-minimally coupled to gravity.Contrary to the case of minimally coupled models which typically predict scale-invariant mass distributions for the generated PBHs at small scales, we demonstrate how broadly peaked PBH spectra naturally arises in this setup. For specific parameter values, all of dark matter can be accounted for by PBHs.Dedicated to the memory of Pierre Binétruy

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Section: An Example: Attractor Modelsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

PBH dark matter from axion inflation

Domcke

Muia

Pieroni

et al. 2017

J. Cosmol. Astropart. Phys.

109

View full text Add to dashboard Cite

show abstract

“…On the other hand, laser interferometer gravitational wave observatories are sensitive to the GWB today, and provide probes of much smaller scales: k CMB ∼ 10 −4 Mpc −1 vs. k interf ∼ 10 13 Mpc −1 [20]. In the case of single-field slow-roll inflation the tensor spectrum is expected to have a small red-tilt (n T = −r/8, where n T is the tilt of the tensor spectrum P h ∼ k n T ), in which case modern interferometers would not be sensitive enough to make a detection.…”

Section: Introductionmentioning

confidence: 99%

Finding the chiral gravitational wave background of an axion- SU(2) inflationary model using CMB observations and laser interferometers

et al. 2018

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A detection of B-mode polarization of the Cosmic Microwave Background (CMB) anisotropies would confirm the presence of a primordial gravitational wave background (GWB). In the inflation paradigm this would be an unprecedented probe of the energy scale of inflation as it is directly proportional to the power spectrum of the GWB. However, similar tensor perturbations can be produced by the matter fields present during inflation, breaking the simple relationship between energy scale and the tensor-to-scalar ratio r. It is therefore important to find ways of distinguishing between the generation mechanisms of the GWB. Without doing a full model selection, we analyse the detectability of a new axion-SU(2) gauge field model by calculating the signal-to-noise of future CMB and interferometer observations sensitive to the chirality of the tensor spectrum. We forecast the detectability of the resulting CMB temperature and B-mode (TB) or E-mode and B-mode (EB) cross-correlation by the LiteBIRD satellite, considering the effects of residual foregrounds, gravitational lensing, and assess the ability of such an experiment to jointly detect primordial TB and EB spectra and self-calibrate its polarimeter. We find that LiteBIRD will be able to detect the chiral signal for r * > 0.03 with r * denoting the tensor-to-scalar ratio at the peak scale, and that the maximum signal-to-noise for r * < 0.07 is ∼ 2. We go on to consider an advanced stage of a LISA-like mission, which is designed to be sensitive to the intensity and polarization of the GWB. We find that such experiments would complement CMB observations as they would be able to detect the chirality of the GWB with high significance on scales inaccessible to the CMB. We conclude that CMB two-point statistics are limited in their ability to distinguish this model from a conventional vacuum fluctuation model of GWB generation, due to the fundamental limits on their sensitivity to parity-violation. In order to test the predictions of such a model as compared to vacuum fluctuations it will be necessary to test deviations from the self-consistency relation, or use higher order statistics to leverage the non-Gaussianity of the model. On the other hand, in the case of a spectrum peaked at very small scales inaccessible to the CMB, a highly significant detection could be made using space-based laser interferometers.

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“…Other models of PBH production not considered here can be found in Refs. [27,[46][47][48][49][50]. For each model, we calculate the resulting SGW spectrum.…”

Section: Models Of Primordial Scalar Spectramentioning

confidence: 99%

Inflationary theory and pulsar timing investigations of primordial black holes and gravitational waves

2017

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The gravitational waves measured at LIGO are presumed here to come from merging primordial black holes. We ask how these primordial black holes could arise through inflationary models while not conflicting with current experiments. Among the approaches that work, we investigate the opportunity for corroboration through experimental probes of gravitational waves at pulsar timing arrays. We provide examples of theories that are already ruled out, theories that will soon be probed, and theories that will not be tested in the foreseeable future. The models that are most strongly constrained are those with a relatively broad primordial power spectrum.

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Gravitational waves at interferometer scales and primordial black holes in axion inflation

Cited by 227 publications

References 164 publications

PBH dark matter from axion inflation

PBH dark matter from axion inflation

Finding the chiral gravitational wave background of an axion- SU(2) inflationary model using CMB observations and laser interferometers

Inflationary theory and pulsar timing investigations of primordial black holes and gravitational waves

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