Model comparison tests of modified gravity from the Eöt-Wash experiment

Krishak, Aditi; Desai, S.

doi:10.1088/1475-7516/2020/07/006

Cited by 25 publications

(22 citation statements)

References 68 publications

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“…A comparison and contrast of these methods can be found in [43][44][45][46][47][48][49][50]. In our previous works, we have applied all these techniques to a large number of model selection problems in Astrophysics and Cosmology [40,[51][52][53][54][55][56][57][58][59]. In this work, we shall only use the Bayesian method for model comparison, as this is the most robust among the various techniques and does not involve any assumptions [46].…”

Section: Bayesian Model Comparisonmentioning

confidence: 99%

Search for Lorentz Invariance Violation from stacked Gamma-Ray Burst spectral lag data

Agrawal,

Singirikonda,

Desai

2021

Preprint

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A number of works have found evidence for a turn-over in the spectral lag data for individual Gamma-Ray Bursts (GRBs), caused by an energy-dependent speed of light, which could be a possible manifestation of Lorentz invariance violation (LIV). Here, we stack spectral lag data from a total of 37 GRBs (with a total of 91 measurements), to verify if the combined data is consistent with a unified model consisting of intrinsic astrophysical emission, along with another contribution due to LIV. We then carry out Bayesian model comparison to ascertain if this combined spectral lag data shows a preference for an energy-dependent speed of light, as compared to an intrinsic astrophysical emission mechanism. We do not find a decisive evidence for such an energy-dependent speed of light for two different models of LIV. Furthermore, none of the models considered provide a good fit to the stacked spectral lag data.

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Section: Bayesian Model Comparisonmentioning

confidence: 99%

Search for Lorentz Invariance Violation from stacked Gamma-Ray Burst spectral lag data

Agrawal,

Singirikonda,

Desai

2021

Preprint

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“…The vacuum energy remains approximately constant over large distances, but exhibits granularity on scales of order l Λ 0.1 mm [16,28,29]. It is therefore intriguing that tentative evidence for small oscillations in the gravitational force, with approximately this wavelength, has already been observed [30,31].…”

Section: The Vacuum Energy Revisitedmentioning

confidence: 99%

Why space could be quantised on a different scale to matter

Lake

2021

SciPost Phys. Proc.

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The scale of quantum mechanical effects in matter is set by Planck’s constant, \hbarℏ. This represents the quantisation scale for material objects. In this article, we present a simple argument why the quantisation scale for space, and hence for gravity, may not be equal to \hbarℏ. Indeed, assuming a single quantisation scale for both matter and geometry leads to the `worst prediction in physics’, namely, the huge difference between the observed and predicted vacuum energies. Conversely, assuming a different quantum of action for geometry, \beta \ll \hbarβ≪ℏ, allows us to recover the observed density of the Universe. Thus, by measuring its present-day expansion, we may in principle determine, empirically, the scale at which the geometric degrees of freedom should be quantised.

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“…A constant source frame intrinsic lag was posited. Information theoretical criteria such as AIC and BIC [36] were used to test for the significance of a putative LIV signature compared to the null hypothesis of only intrinsic spectral lag. No such evidence was found and a 95% c.l.…”

Section: Introductionmentioning

confidence: 99%

Search for Lorentz Invariance Violation using Bayesian model comparison applied to Xiao et al. GRB spectral lag catalog

Desai¹,

Agrawal²,

Singirikonda³

2022

Preprint

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We use the spectral lag catalog of 46 short GRBs obtained by Xiao et al [1] between two fixed energy intervals in the source frame, to carry out an independent search for Lorentz Invariance violation (LIV). For this purpose, we use a power-law model as a function of energy for the intrinsic astrophysical induced spectral lags. The expansion history of the universe needed for the evaluation of LIV was obtained in a non-parametric method using cosmic chronometers. We use Bayesian model comparison to determine if the aforementioned spectral lags show evidence for LIV as compared to only astrophysically induced lags. We do any find any evidence for LIV, and obtain 95% c.l. lower limits for the energy scale of LIV to be 4 × 10 15 GeV and 6.8 × 10 9 GeV for the linear and quadratic LIV models respectively.

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Model comparison tests of modified gravity from the Eöt-Wash experiment

Cited by 25 publications

References 68 publications

Search for Lorentz Invariance Violation from stacked Gamma-Ray Burst spectral lag data

Search for Lorentz Invariance Violation from stacked Gamma-Ray Burst spectral lag data

Why space could be quantised on a different scale to matter

Search for Lorentz Invariance Violation using Bayesian model comparison applied to Xiao et al. GRB spectral lag catalog

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