From Emergent Gravity to Dark Energy and Dark Matter - a podcast by Michael Haack

The observed deviations from the laws of gravity of Newton and Einstein
in galaxies and clusters can logically speaking be either due tothe presence of unseen dark matter particles or due to a change in
the way gravity works in these situations. Until recently there waslittle reason to doubt that general relativity correctly describes gravity
in all circumstances. In the past few year insights from black holephysics and string theory have lead to a new theoretical framework in
which the gravitational laws are derived from the quantum entanglementof the microscopic information that is underlying space-time.
An essential ingredient in the derivation is of the Einstein equationsis that the vacuum entanglement obeys an area law, a condition that
is known to hold in Anti-de Sitter space due to the work of Ryuand Takayanagi. We will argue that in de Sitter space due to the
positive dark energy, that the microscopic entanglement entropy alsocontains also a volume law contribution in addition to the area law.
This volume law contribution is related to the thermal properties ofde Sitter space and leads to a total entropy that precisely matches the
Bekenstein-Hawking formula for the cosmological horizon. We studythe effect of this extra contribution on the emergent laws of gravity,
and argue that it leads to a modification compared to Einstein gravity.We provide evidence for the fact this modification explains the
observed phenomena in galaxies and clusters currently attributed todark matter.

Further episodes of Sommerfeld Theory Colloquium (ASC)

Further podcasts by Michael Haack

Website of Michael Haack