Low-redshift tests of Newtonian cosmologies with a time-varying gravitational constant

Hanımeli, Ekim Taylan; Tutusaus, Isaac; Lamine, Brahim; Blanchard, Alain

doi:10.48550/arxiv.1906.11219

2019

DOI: 10.48550/arxiv.1906.11219

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Low-redshift tests of Newtonian cosmologies with a time-varying gravitational constant

Ekim Taylan Hanımeli,

Isaac Tutusaus,

Brahim Lamine

et al.

Abstract: In this work we investigate cosmologies with a time-varying gravitational constant, G(t), as an alternative to having a cosmological constant. Since, it is known in the literature that, in general relativity, having a variable gravitational constant breaks the conservation of energy unless further dynamical components are added, we consider a Newtonian approach, in which the energy conservation is ensured. We investigate whether these cosmologies are able to reproduce the cosmological acceleration without a co… Show more

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“…Cosmology without having General Relativity (GR) can be formulated from Newton's theory [2][3][4][5][6][7][8]. The Friedmann equation that describes the expansion of the Universe has a form of kinetic part ȧ2 and a potential-like part V (a) [9], where a is the scale factor of the universe.…”

Section: Introductionmentioning

confidence: 99%

Noether Symmetry in Newtonian Dynamics and Cosmology

Guendelman,

Zamlung,

Benisty

2020

Preprint

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Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.

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“…Cosmology without having General Relativity (GR) can be formulated from Newton's theory [2][3][4][5][6][7][8]. The Friedmann equation that describes the expansion of the Universe has a form of kinetic part ȧ2 and a potential-like part V (a) [9], where a is the scale factor of the universe.…”

Section: Introductionmentioning

confidence: 99%

Noether Symmetry in Newtonian Dynamics and Cosmology

Guendelman,

Zamlung,

Benisty

2020

Preprint

Get access via publisher Add to dashboard Cite

Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.

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