Tracking the Local Group Dynamics by Extended Gravity

Benisty, David; Capozziello, Salvatore

doi:10.48550/arxiv.2301.06614

Cited by 2 publications

(2 citation statements)

References 85 publications

(98 reference statements)

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“…The last equation is an important result for the following reason: we obtained a Yukawa gravitational potential purely in the framework of GR when taking into account the presence of dark energy which naturally induces mass to the graviton. By contrast, Yukawa-like corrections to the gravitational potential in the weak field limit are typically obtained in extended theories of gravity, such as f (R) models of gravity [49,50]. It is interesting to point out that in many extended theories of gravity in the Yukawa-like potential we have a contribution of a massless graviton as in General Relativity along with massive scalar field that couples gravitationally to matter.…”

Section: Jcap08(2024)012mentioning

confidence: 99%

Graviton mass due to dark energy as a superconducting medium-theoretical and phenomenological aspects

Inan,

Ali,

Jusufi

et al. 2024

J. Cosmol. Astropart. Phys.

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It is well known that the cosmological constant term in the Einstein field equations can be interpreted as a stress tensor for dark energy. This stress tensor is formally analogous to an elastic constitutive equation in continuum mechanics. As a result, the cosmological constant leads to a “shear modulus” and “bulk modulus” affecting all gravitational fields in the universe. The form of the constitutive equation is also analogous to the London constitutive equation for a superconductor. Treating dark energy as a type of superconducting medium for gravitational waves leads to a Yukawa-like gravitational potential and a massive graviton within standard General Relativity. We discuss a number of resulting phenomenological aspects such as a screening length scale that can also be used to describe the effects generally attributed to dark matter. In addition, we find a gravitational wave plasma frequency, index of refraction, and impedance. The expansion of the universe is interpreted as a Meissner-like effect as dark energy causes an outward “expulsion” of space-time similar to a superconductor expelling a magnetic field. The fundamental cause of these effects is interpreted as a type of spontaneous symmetry breaking of a scalar field. There is an associated chemical potential, critical temperature, and an Unruh-Hawking effect associated with the formulation.

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Section: Jcap08(2024)012mentioning

confidence: 99%

Graviton mass due to dark energy as a superconducting medium-theoretical and phenomenological aspects

Inan,

Ali,

Jusufi

et al. 2024

J. Cosmol. Astropart. Phys.

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“…Of course tests of DE are not limited to cosmological scales. Various tests of DE on astrophysical, astronomical, and even local scales, have been considered over the past decades, see refs [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. for examples in this sense.3 Distant galaxies are also useful as a test of cosmological models through their ages, which of course cannot exceed the age of the Universe: see for instance refs [32][33][34][35][36][37][38].…”

mentioning

confidence: 99%

Negative cosmological constant in the dark energy sector: tests from JWST photometric and spectroscopic observations of high-redshift galaxies

Menci,

Adil,

Mukhopadhyay

et al. 2024

J. Cosmol. Astropart. Phys.

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Early observations with the James Webb Space Telescope (JWST) have revealed the existence of an unexpectedly large abundance of extremely massive galaxies at redshifts z ≳ 5: these are in tension with the predictions not only of the standard ΛCDM cosmology, but also with those of a wide class of dynamical dark energy (DE) models, and are generally in better agreement with models characterized by a phantom behaviour. Here we consider a model, inspired by string theory and the ubiquity of anti-de Sitter vacua therein, featuring an evolving DE component with positive energy density on top of a negative cosmological constant, argued in an earlier exploratory analysis to potentially be able to explain the JWST observations. We perform a robust comparison of this model against JWST data, considering both photometric observations from the CEERS program, and spectroscopic observations from the FRESCO survey. We show that the model is able to accommodate the JWST observations, with a consistency probability of up to 98%, even in the presence of an evolving component with a quintessence-like behaviour (easier to accommodate theoretically compared to phantom DE), while remaining consistent with standard low-redshift probes. Our results showcase the potential of measurements of high-redshift galaxy abundances in tests of fundamental physics, and their complementarity with standard cosmological probes.

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Tracking the Local Group Dynamics by Extended Gravity

Cited by 2 publications

References 85 publications

Graviton mass due to dark energy as a superconducting medium-theoretical and phenomenological aspects

Graviton mass due to dark energy as a superconducting medium-theoretical and phenomenological aspects

Negative cosmological constant in the dark energy sector: tests from JWST photometric and spectroscopic observations of high-redshift galaxies

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