Primordial black holes from no-scale supergravity

Nanopoulos, Dimitri V.; Spanos, Vassilis C.; Stamou, Ioanna D.

doi:10.1103/physrevd.102.083536

Cited by 42 publications

(51 citation statements)

References 73 publications

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“…In figure 2 we show the scalar power spectrum for the superpotentials W 1 and W 2 , given from Eqs. (11) and (12), with red and blue respectively. We can notice that we have an significant enhancement of power at around 10 13 M pc −1 .…”

Section: Evaluating Scalar Power Spectrummentioning

confidence: 99%

Primordial Black Holes And Gravitational Waves Based On No-Scale Supergravity

Stamou

2021

Preprint

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In this paper we present a class of models in order to explain the production of Primordial Black Holes (PBHs) and Gravitational Waves (GWs) in the Universe. These models are based on no-scale theory. By breaking the SU(2,1)/SU(2)×U(1) symmetry we fix one of the two chiral fields and we derive effective scalar potentials which are capable of generating PBHs and GWs. As it is known in the literature there is an important unification of the no-scale models, which leads to the Starobinsky effective scalar potential based on the coset SU(2,1)/SU(2)×U(1). We use this unification in order to additionally explain the generation of PBHs and GWs. Concretely, we modify well-known superpotentials, which reduce to Starobinsky-like effective scalar potentials. Thus, we derive scalar potentials which, on the one hand, explain the production of PBHs and GWs and, on the other hand, they conserve the transformation laws, which yield from the parametrization of the coset SU(2,1)/SU(2)×U(1) as well as the unification between the models which are yielded this coset. We numerically evaluate the scalar power spectra with the effective scalar potential based on this theory. Furthermore, we evaluate the fractional abundances of PBHs by comparing two methods the Press-Schechter approach and the peak theory, while focusing on explaining the dark matter in the Universe. By using the resulting scalar power spectrum we evaluate the amount of GWs. All models are in complete consistence with Planck constraints.

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Section: Evaluating Scalar Power Spectrummentioning

confidence: 99%

Primordial Black Holes And Gravitational Waves Based On No-Scale Supergravity

Stamou

2021

Preprint

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“…As a result, many theoretical studies have appeared in the literature [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29], which explain the production of PBH as a fraction of DM of the Universe. This PBH production during the radiation dominance epoch, can be associated to a significant enhancement of the scalar power spectrum.…”

Section: Introductionmentioning

confidence: 99%

“…This PBH production during the radiation dominance epoch, can be associated to a significant enhancement of the scalar power spectrum. Many of these models are based on single field inflation and especially on models with a near inflection point in the effective scalar potential [13][14][15][16][17][18][19][20][21][22]. The required enhancement factor of the power spectrum is calculated to be seven order of magnitudes [13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…Many of these models are based on single field inflation and especially on models with a near inflection point in the effective scalar potential [13][14][15][16][17][18][19][20][21][22]. The required enhancement factor of the power spectrum is calculated to be seven order of magnitudes [13][14][15][16][17][18][19][20][21][22]. A severe drawback of these models, is the high level of the necessary fine-tuning, in order to achieve such a big amplification of the power spectrum.…”

Section: Introductionmentioning

confidence: 99%

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Gravitational Waves and Primordial Black Holes from Supersymmetric Hybrid Inflation

Spanos,

Stamou

2021

Preprint

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We study the effect of supergravity corrections due to a linear and a bilinear term in the Kähler potential, in the context of a supersymmetric hybrid inflation model. By appropriate choice of the parameters associated to these terms, we are able to satisfy the main cosmological constraints for the spectral index n s and the tensorto-scalar ratio r. In addition, this model predicts primordial black hole abundance enough to account for the whole dark matter of the Universe and gravitational wave spectra within the reach of future detection experiments. The predictions of the model can be made compatible to the NANOGrav reported signal, at the cost of significantly lower primordial black hole abundance.

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“…The SUSY grand unification theory (GUT) model we study merges the realistic intersecting D6-brane model [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47] with the phenomenologically [48][49][50][51][52][53][54][55][56][57][58][59] and cosmologically [60][61][62][63][64][65][66][67][68][69] favorable No-Scale flipped SU (5). The union of these with extra vector-like matter, dubbed flippons [50], is referred to as the F -SU(5) D-brane model, which in aggregate reinforces deep theoretical constructions, furnishing a compelling natural GUT candidate for our universe.…”

Section: Introductionmentioning

confidence: 99%

Resolving the (g − 2)μ discrepancy with $$ \mathcal{F} $$–SU(5) intersecting D-branes

Lamborn

Maxin

et al. 2021

J. High Energ. Phys.

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A discrepancy between the measured anomalous magnetic moment of the muon (g − 2)μ and computed Standard Model value now stands at a combined 4.2σ following experiments at Brookhaven National Lab (BNL) and the Fermi National Accelerator Laboratory (FNAL). A solution to the disagreement is uncovered in flipped SU(5) with additional TeV-Scale vector-like 10 + $$ \overline{\mathbf{10}} $$ 10 ¯ multiplets and charged singlet derived from local F-Theory, collectively referred to as $$ \mathcal{F} $$ F –SU(5). Here we engage general No-Scale supersymmetry (SUSY) breaking in $$ \mathcal{F} $$ F –SU(5) D-brane model building to alleviate the (g −2)μ tension between the Standard Model and observations. A robust ∆aμ(SUSY) is realized via mixing of M5 and M1X at the secondary SU(5) × U(1)X unification scale in $$ \mathcal{F} $$ F –SU(5) emanating from SU(5) breaking and U(1)X flux effects. Calculations unveil ∆aμ(SUSY) = 19.0–22.3 × 10−10 for gluino masses of M($$ \overset{\sim }{g} $$ g ~ )= 2.25–2.56 TeV and higgsino dark matter, aptly residing within the BNL+FNAL 1σ mean. This (g − 2)μ favorable region of the model space also generates the correct light Higgs boson mass and branching ratios of companion rare decay processes, and is further consistent with all LHC Run 2 constraints. Finally, we also examine the heavy SUSY Higgs boson in light of recent LHC searches for an extended Higgs sector.

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Primordial black holes from no-scale supergravity

Cited by 42 publications

References 73 publications

Primordial Black Holes And Gravitational Waves Based On No-Scale Supergravity

Primordial Black Holes And Gravitational Waves Based On No-Scale Supergravity

Gravitational Waves and Primordial Black Holes from Supersymmetric Hybrid Inflation

Resolving the (g − 2)μ discrepancy with $$ \mathcal{F} $$–SU(5) intersecting D-branes

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