New physics in light of the $H_0$ tension: an alternative view

Vagnozzi, Sunny

doi:10.48550/arxiv.1907.07569

Cited by 80 publications

(90 citation statements)

References 153 publications

(216 reference statements)

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“…A large class of dark energy models which require an equation of state w < −1 is immediately ruled out. This is of enormous phenomenological importance since the recent Hubble tension is seemingly alleviated by dark energy models which have a phantom component [43,44] and our condition (11) would severely disfavor such Lagrangians.…”

Section: Cosmological Implicationsmentioning

confidence: 99%

The four-dimensional null energy condition as a swampland conjecture

Bernardo,

Brahma,

Dasgupta

et al. 2021

Preprint

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We analyze four-dimensional Friedmann-Lemaître-Robertson-Walker cosmologies in type IIB, arising from a M-theory dual, and find that the null energy condition (NEC) has to be obeyed by them (except for the negatively curved case) in order for the M-theory action to have a Wilsonian effective description. However, this does not imply that the M-theory metric has to obey the 11d NEC. Thus, we propose a new swampland conjecture -the 4d NEC is a consistency condition for any theory to have a completion within M-theory -with an explicit derivation of it for cosmological backgrounds from a top-down perspective. We briefly discuss the cosmological consequences of such a condition derived from M-theory.

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Section: Cosmological Implicationsmentioning

confidence: 99%

The four-dimensional null energy condition as a swampland conjecture

Bernardo,

Brahma,

Dasgupta

et al. 2021

Preprint

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“…The presence of stable sterile neutrino mass state with the mass 1.1 eV will make an impact on a value of the important cosmological parameter ∆N ef f , besides it is possible this can matter for the resolution of the issue concerning the H 0 tension. 33,34…”

Section: Discussionmentioning

confidence: 99%

“…The m 4 and practically m 6 mass values are unchanged, furthermore the m 4 value meets currently available constraints . 33,34 Thus, below we will use the following m 4 , m 5 , and m 6 mass values for sterile mass states:…”

Section: Basic Concepts Of the Phenomenological (3+1+2) Modelmentioning

confidence: 99%

Interpretation of the XENON1T excess in the model with decaying sterile neutrinos

Khruschov

2020

Preprint

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The phenomenological model with three active and three sterile neutrinos is used for interpretation of the observed XENON1T excess of electronic recoil events in the 1 -7 keV energy region. Assuming two sterile neutrinos with appropriate mass values decay while the third sterile neutrino is stable it is possible to explain the observed energy spectrum of electronic recoil events. Moreover using this approach three peaks in the 1 -7 keV energy region are predicted. Dark bosons have to mix to only a small extent with photons which can emit the energy in this region. The possible existence of the three massive sterile neutrinos may have perceptible influence on some phenomena in neutrino physics, astrophysics and cosmology.

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“…Despite the numerous attempts to solve this discrepancy, its mechanism remains still unclear. There are various proposals and different approaches for solving this problem in cosmology [23,24]. In particular, the H 0 tension is proposed as the result of factors such as the curvature, the neutrino masses, the effective number of neutrino species, and so on [25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Hubble tension bounds the GUP and EUP parameters

Aghababaei,

Moradpour,

Vagenas

2021

Preprint

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In recent years the discrepancy in the value of the Hubble parameter has been growing. Recently, there are works supporting the proposal that the uncertainty principles can solve the Hubble tension. Motivated by this proposal, we work with an isotropic and homogeneous FRW universe, obtain its Hamiltonian equations, and thus, the Hubble parameter through the first Friedmann equation. In the context of GUP and EUP models, the Hubble parameter is modified. Since the fingerprints of quantum gravity are imprinted on the CMB, we consider the GUP/EUP-modified Hubble parameter in the first Friedmann equation to be the one measured by the Planck collaboration which uses the CMB data. The unmodified Hubble parameter in the first Friedmann equation is considered to be the one measured by the HST group which uses the SNeIa data. Therefore, upper bounds for the dimensionless parameters of GUP and EUP are obtained.

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New physics in light of the $H_0$ tension: an alternative view

Cited by 80 publications

References 153 publications

The four-dimensional null energy condition as a swampland conjecture

The four-dimensional null energy condition as a swampland conjecture

Interpretation of the XENON1T excess in the model with decaying sterile neutrinos

Hubble tension bounds the GUP and EUP parameters

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