Constraints on <i>f</i>(<i>T</i>) cosmology with Pantheon+

Briffa, Rebecca; Escamilla-Rivera, Celia; Said, Jackson Levi; Mifsud, Jurgen

doi:10.1093/mnras/stad1384

Cited by 20 publications

(3 citation statements)

References 76 publications

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“…Similarly to effective field theory methods, one can use observations to constrain the value of these four parameters, without specifying any particular model or initial conditions and thus test possible deviations from ΛCDM. Given a specific background evolution, which can also be obtained merely by the observations [74][75][76][77][78][79], and the value of the matter density today [15], one can fully determine the evolution of large-scale structure in the Universe. The physical meaning of these timedependent functions is as follows:…”

Section: Alpha Parametersmentioning

confidence: 99%

Cosmological perturbations in the teleparallel analog of Horndeski gravity

Ahmedov,

Dialektopoulos,

Levi Said

et al. 2023

J. Cosmol. Astropart. Phys.

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In this work we study the cosmological perturbations in Bahamonde-Dialektopoulos-Levi Said (BDLS) theory, i.e. the teleparallel analog of Horndeski gravity. In order to understand the evolution of structure in a cosmological model, it is necessary to study its cosmology not only in the background but also perturbatively. Both Horndeski and its teleparallel analog have been analyzed a lot in the literature, but in order to study them quantitatively, we need to know their cosmological perturbations. That is why, we study here the scalar-vector-tensor decomposition of the theory and we also express the so-called alpha parameters in terms of the arbitrary functions of the theory, that designate the deviation from the ΛCDM model. We have explored tensor, vector and scalar perturbation of the action up to second order, which drastically opens up new possibilities on searches in the parameter space of scalar-tensor theories in the context of observations.

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Section: Alpha Parametersmentioning

confidence: 99%

Cosmological perturbations in the teleparallel analog of Horndeski gravity

Ahmedov,

Dialektopoulos,

Levi Said

et al. 2023

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

“…Given the importance of the H 0 tension, it is crucial to investigate other cosmological models addressing this tension. These investigations are looking for the cosmologies that increase the H 0 value inferred from CMB data to resolve the tension (Solà et al 2017;Solà Peracaula et al 2019Freese & Winkler 2021;Sabla & Caldwell 2021;Bargiacchi et al 2023;Briffa et al 2023). These attempts may be helpful in solving or alleviating the mentioned problem, as well as other problems that suffer from the concordance model, namely, σ 8 tension and the fine-tuning and cosmic coincidence problems.…”

Section: Introductionmentioning

confidence: 99%

Oscillating Dark Energy in Light of the Latest Observations and Its Impact on the Hubble Tension

Rezaei

2024

ApJ

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In this paper, we have performed a comparative study of different types of oscillating dark energy (DE) models using the Metropolis algorithm of Markov Chain Monte Carlo. Eight different oscillating parameterizations are examined herein that have demonstrated considerable ability to fit the overall cosmological observations, including the Pantheon sample of Type Ia supernovae, baryon acoustic oscillations, cosmic chronometer Hubble data, and distance priors of the Planck cosmic microwave background. In order to compare the consistency of these models with observations, we have used both the Akaike and deviance information criteria. Although the values of the Akaike information criterion for different models indicate that there is no support for oscillating DE models, the deviance information criterion showed that there is significant support for some of these models. Our results showed that these models are capable of solving the cosmic coincidence problem and alleviating the Hubble tension. Comparing the H 0 values obtained for different oscillating scenarios with that of ΛCDM, we observed that our oscillating models led to H 0 ¯ = 69.78 , which is 0.29 greater than H 0,Λ and thus reduces the Hubble tension. Among all of the models, model 1, with H 0 = 70.00 ± 0.71, is the most capable of alleviating the H 0 tension. Furthermore, we examined our models assuming H 0 = 73.0 ± 1.4 from SHoES measurements. We find that adding this data point to our data combination led to a Δ H 0 ¯ = 0.95 increase in the H 0 value for different models.

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“…Yet, the unanswered questions remain, with the tensions in cosmology the most famous among them. Currently, the Hubble tensions stands at > 5σ [1,2] and the need for new approaches is clear [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Probing for Lorentz Invariance Violation in Pantheon Plus Dominated Cosmology

Staicova

2024

Universe

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The Hubble tension in cosmology is not showing signs of alleviation and thus, it is important to look for alternative approaches to it. One such example would be the eventual detection of a time delay between simultaneously emitted high-energy and low-energy photons in gamma-ray bursts (GRB). This would signal a possible Lorentz Invariance Violation (LIV) and in the case of non-zero quantum gravity time delay, it can be used to study cosmology as well. In this work, we use various astrophysical datasets (BAO, Pantheon Plus and the CMB distance priors), combined with two GRB time delay datasets with their respective models for the intrinsic time delay. Since the intrinsic time delay is considered the largest source of uncertainty in such studies, finding a better model is important. Our results yield as quantum gravity energy bound EQG≥1017 GeV and EQG≥1018 GeV respectively. The difference between standard approximation (constant intrinsic lag) and the extended (non-constant) approximations is minimal in most cases we conside. However, the biggest effect on the results comes from the prior on the parameter cH0rd, emphasizing once again that at current precision, cosmological datasets are the dominant factor in determining the cosmology. We estimate the energies at which cosmology gets significantly affected by the time delay dataset.

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Constraints on f(T) cosmology with Pantheon+

Cited by 20 publications

References 76 publications

Cosmological perturbations in the teleparallel analog of Horndeski gravity

Cosmological perturbations in the teleparallel analog of Horndeski gravity

Oscillating Dark Energy in Light of the Latest Observations and Its Impact on the Hubble Tension

Probing for Lorentz Invariance Violation in Pantheon Plus Dominated Cosmology

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