Combining cosmological and local bounds on bimetric theory

Caravano, Angelo; Lüben, Marvin; Weller, Jochen

doi:10.48550/arxiv.2101.08791

2021

DOI: 10.48550/arxiv.2101.08791

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Combining cosmological and local bounds on bimetric theory

Angelo Caravano,

Marvin Lüben,

Jochen Weller

Abstract: Ghost-free bimetric theory describes two nonlinearly interacting spin-2 fields, one massive and one massless, thus extending general relativity. We confront bimetric theory with observations of Supernovae type 1a, Baryon Acoustic Oscillations and the Cosmic Microwave Background in a statistical analysis, utilising the recently proposed physical parametrisation. This directly constrains the physical parameters of the theory, such as the mass of the spin-2 field and its coupling to matter. We find that all model… Show more

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“…The presence of the massless graviton allows gravitational wave observations to be satisfied without severely restricting the parameter space of the theory [7], as opposed to many other modified gravity models. Bimetric gravity is also compatible with cosmological observations like the cosmic microwave background (CMB), type Ia supernovae (SNIa), and baryon acoustic oscillations (BAO) [8][9][10][11][12][13][14][15] and it exhibits a screening mechanism that restores general relativity results on solar-system scales [16][17][18][19][20][21]. Among the interesting properties of the theory are:…”

Section: Introductionmentioning

confidence: 53%

Constraints on bimetric gravity from Big Bang nucleosynthesis

Högås

¹

,

Mörtsell

²

2021

J. Cosmol. Astropart. Phys.

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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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“…The presence of the massless graviton allows gravitational wave observations to be satisfied without severely restricting the parameter space of the theory [7], as opposed to many other modified gravity models. Bimetric gravity is also compatible with cosmological observations like the cosmic microwave background (CMB), type Ia supernovae (SNIa), and baryon acoustic oscillations (BAO) [8][9][10][11][12][13][14][15] and it exhibits a screening mechanism that restores general relativity results on solar-system scales [16][17][18][19][20][21]. Among the interesting properties of the theory are:…”

Section: Introductionmentioning

confidence: 53%

Constraints on bimetric gravity from Big Bang nucleosynthesis

Högås

¹

,

Mörtsell

²

2021

J. Cosmol. Astropart. Phys.

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.

show abstract

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