More on emergent dark energy from unparticles

Artymowski, Michał; Ben-Dayan, Ido; Kumar, Utkarsh

doi:10.1103/physrevd.106.083502

Cited by 5 publications

(6 citation statements)

References 31 publications

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“…Recently [49][50][51], we have suggested that Dark Energy is due to a Banks-Zaks theory slightly removed from its conformal fixed point, and at finite temperature. The theory acts as a perfect fluid.…”

Section: Jcap12(2023)047mentioning

confidence: 99%

“…Therefore, it is rather unique compared to other DE models in the literature. In [50,51] we have analyzed the predictions of the model and showed that it is stable. The most notable predictions with respect to ΛCDM are that there is a contribution to N eff -number of relativistic degrees of freedom at decoupling, and a deviation from w DE = −1 -the equation of state of DE, that may be measured in the future.…”

Section: Jcap12(2023)047mentioning

confidence: 99%

“…We first consider the Planck 2018 primary CMB TT, TE, and EE power spectrum data, as it is one of the main drivers of the tension. We have analyzed the Pantheon data only in [51]. The constraints on cosmological parameters at 1-σ CL are tabulated in table 2.…”

Section: Primary Planck 2018mentioning

confidence: 99%

“…The change in power spectra of both CMB temperature anisotropy and matter drives the change of values of H 0 and S 8 . From the unparticles' temperature today we can derive the amount of extra radiation added in the early universe due to unparticles [51], with ∆N eff = 0.216 at decoupling. We plot the resulting 1D distribution for the relevant parameters H 0 , S 8 and Ω m in figure 11.…”

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confidence: 99%

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Emergent Unparticles Dark Energy can restore cosmological concordance

Ben-Dayan,

Kumar

2023

J. Cosmol. Astropart. Phys.

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Addressing the discrepancy between the late and early time measurements of the Hubble parameter, H 0, and the so-called S 8 parameter has been a challenge in precision cosmology. Several models are present to address these tensions, but very few of them can do so simultaneously. In the past, we have suggested Banks-Zaks/Unparticles as an emergent Dark Energy model, and claimed that it can ameliorate the Hubble tension. In this work, we test this claim, and perform a likelihood analysis of the model and its parameters given current data, and compare it to ΛCDM. The model offers a possible resolution of Hubble tension and softens the Large Scale Structure (LSS) tension without employing a scalar field or modifying the gravitational sector. Our analysis shows a higher value of H 0 ∼ 70 – 73 km/sec/Mpc and a slightly lower value of S 8 for certain combinations of data sets. Consideration of Planck CMB data combined with the Pantheon sample and SH0ES priors lowers the H 0 and S 8 tension to 0.96σ and 0.94σ respectively with best-fit Δχ 2 ≈ -11 restoring cosmological concordance. Significant improvement in the likelihood persists for other combinations of data sets as well. Evidence for the model is given by inferring one of its parameters to be x 0 ≃ -4.46. The improvement in the fit is driven by the inclusion of the SH0ES prior. In its absence most of the improvement is due to larger error bars in the Emergent Unparticles Dark Energy model.

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Section: Jcap12(2023)047mentioning

confidence: 99%

Section: Jcap12(2023)047mentioning

confidence: 99%

Section: Primary Planck 2018mentioning

confidence: 99%

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confidence: 99%

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Emergent Unparticles Dark Energy can restore cosmological concordance

Ben-Dayan,

Kumar

2023

J. Cosmol. Astropart. Phys.

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“…In 2007, Georgi [1] proposed the existence of a hidden conformal symmetry sector beyond the Standard Model (SM) of particle physics, termed unparticle. Since then, the effects of unparticles have been explored in many subjects, including collider physics [2][3][4][5][6], neutrino physics [7,8], cosmology and astrophysics [9,10], quantum electrodynamics [11,12], dark energy [13][14][15][16], etc. The recent nonrelativistic extension of unparticle physics has led to a new concept of unnucleus [17] and provided an interpretation of neutral charm mesons near threshold [18].…”

Section: Introductionmentioning

confidence: 99%

Exotic spin-dependent interactions through unparticle exchange

Wu,

Zhang,

Yan

2024

J. High Energ. Phys.

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The potential discovery of unparticles could have far-reaching implications for particle physics and cosmology. For over a decade, high-energy physicists have extensively studied the effects of unparticles. In this study, we derive six types of nonrelativistic potentials between fermions induced by unparticle exchange in coordinate space. We consider all possible combinations of scalar, pseudo-scalar, vector, and axial-vector couplings to explore the full range of possibilities. Previous studies have only examined scalar-scalar (SS), pseudoscalar-pseudoscalar (PP), vector-vector (VV), and axial-axial-vector (AA) type interactions, which are all parity even. We propose SP and VA interactions to extend our understanding of unparticle physics, noting that parity conservation is not always guaranteed in modern physics. We explore the possibilities of detecting unparticles through the long-range interactions they may mediate with ordinary matter. Dedicated experiments using precision measurement methods can be employed to search for such interactions. We discuss the properties of these potentials and estimate constraints on their coupling constants based on existing experimental data. Our findings indicate that for some particular values of the scaling dimension $$ {d}_{\mathcal{U}} $$ d U , the coupling between scalar or vector unparticles and fermions is constrained by several orders of magnitude more tightly than the previous limits. The underlying reason for this improvement is analyzed. Limits are also set on the newly proposed SP and VA interactions for continuous $$ {d}_{\mathcal{U}} $$ d U values, allowing the exploration of the $$ {d}_{\mathcal{U}} $$ d U dependence of the constraints. It turns out that the bounds exhibit an exponential decay trend with the increasing $$ {d}_{\mathcal{U}} $$ d U .

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