Related Experiment Video
Updated: May 3, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
Topology and dark energy: testing gravity in voids
Douglas Spolyar1, Martin Sahlén2, Joe Silk3
1Institut d'Astrophysique de Paris, 98 bis boulevard Arago, 75014 Paris, France.
Modified gravity theories propose a massive graviton, introducing a scalar field that alters dark energy. This could resolve cosmological tensions and create observable effects in cosmic voids.
Area of Science:
- Cosmology
- Theoretical Physics
- Gravitational Physics
Background:
- Modified gravity theories are explored as alternatives to dark matter and dark energy.
- A massive graviton introduces a scalar field, potentially explaining dark energy's properties.
Purpose of the Study:
- To investigate a massive graviton model with Galileon symmetry for dark energy.
- To analyze the impact of this scalar field on the dark energy equation of state.
- To explore potential observational consequences, such as gravitational slip and topological defects.
Main Methods:
- Theoretical modeling of modified gravity with a massive graviton and a Galileon-type scalar field.
- Analysis of the scalar field's influence on the dark energy equation of state.
- Investigation of phenomena in cosmic voids, including gravitational slip and domain wall formation.
Main Results:
- The scalar field leads to a density and scale-dependent dark energy equation of state.
- This model may alleviate tensions between Type Ia supernovae and Planck data.
- Significant alterations in cosmic voids include a detectable gravitational slip and topological defects.
Conclusions:
- A massive graviton with Galileon symmetry offers a viable framework for modified dark energy.
- Observable signatures like gravitational slip in voids could distinguish this model.
- The theory predicts a complex vacuum structure leading to domain walls.
More Related Videos
06:57Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
Published on: July 17, 2020
11:03An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
Related Concept Videos
Detection of Black Holes
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
Schwarzschild Radius and Event Horizon
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape...
Space-Time Curvature and the General Theory of Relativity
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of...
Gravitation Between Spherically Symmetric Masses
Gravity between Spherical Bodies
This assumption can be proved easily by showing that the expression for gravitational potential energy between a hollow sphere of mass (M) and a point mass (m) is the same as it would be for a pair of extended...
The Principle of Superposition and the Gravitational Field