Modave Lectures on Fuzzballs and Emission from the D1-D5 System

TL;DR

This paper introduces the fuzzball proposal and emission mechanisms in the D1-D5 system, comparing gravity and CFT perspectives, and clarifies how different emission processes are related.

Contribution

It provides an accessible overview of fuzzballs, detailed emission calculations, and unifies various emission phenomena within the D1-D5 system from gravity and CFT viewpoints.

Findings

Demonstrates equivalence of Hawking radiation, superradiance, and ergoregion emission in the D1-D5 system.

Provides detailed emission calculations for D1-D5-P black holes and fuzzballs.

Clarifies the relationship between different emission processes in gravity and CFT.

Abstract

These lecture notes present an introduction to the fuzzball proposal and emission from the D1-D5 system which is geared to an audience of graduate students and others with little background in the subject. The presentation begins with a discussion of the Penrose process and Hawking radiation. The fuzzball proposal is then introduced, and the two- and three-charge systems are reviewed. In the three-charge case details are not discussed. A detailed discussion of emission calculations for D1-D5-P black holes and for certain non-extremal fuzzballs from both the gravity and CFT perspectives is included. We explicitly demonstrate how seemingly different emission processes in gravity, namely, Hawking radiation and superradiance from D1-D5-P black holes, and ergoregion emission from certain non-extremal fuzzballs, are only different manifestations of the same phenomenon in the CFT.