Related Experiment Video
Updated: Jul 4, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Does the planck mass run on the cosmological-horizon scale?
Georg Robbers1, Niayesh Afshordi, Michael Doran
1Institut für Theoretische Physik, Philosophenweg 16, 69120 Heidelberg, Germany. robbers@thphys.uni-heidelberg.de <robbers@thphys.uni-heidelberg.de>
Abstract:
Einstein's theory of general relativity contains a universal value of the Planck mass. However, one may envisage that in alternative theories of gravity the effective value of the Planck mass (or Newton's constant), which quantifies the coupling of matter to metric perturbations, can run on the cosmological-horizon scale. In this Letter, we study the consequences of a glitch in the Planck mass from subhorizon to superhorizon scales. We show that current cosmological observations severely constrain this glitch to less than 1.2%.
Related Concept Videos
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 velocity with the...
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 motion,...
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...
The Principle of Superposition and the Gravitational Field
The de Broglie Wavelength
The Uncertainty Principle

