# Quantum Nature of Black Holes: Fast Scrambling versus Echoes

## TL;DR

This paper explores the connection between black holes' fast information scrambling and potential gravitational wave echoes, revealing they occur on the same timescale and discussing their holographic interpretation.

## Contribution

It demonstrates that fast scrambling and echoes happen on the same timescale in charged AdS/Schwarzschild black holes, linking two seemingly distinct phenomena.

## Key findings

- Fast scrambling and echoes share the same logarithmic timescale.
- Holographic interpretation of black hole echoes is discussed.
- Results apply to charged AdS/Schwarzschild black holes.

## Abstract

Two seemingly distinct notions regarding black holes have captured the imagination of theoretical physicists over the past decade: First, black holes are conjectured to be fast scramblers of information, a notion that is further supported through connections to quantum chaos and decay of mutual information via AdS/CFT holography. Second, black hole information paradox has motivated exotic quantum structure near horizons of black holes (e.g., gravastars, fuzzballs, or firewalls) that may manifest themselves through delayed gravitational wave echoes in the aftermath of black hole formation or mergers, and are potentially observable by LIGO/Virgo observatories. By studying various limits of charged AdS/Schwarzschild black holes we show that, if properly defined, the two seemingly distinct phenomena happen on an identical timescale of log(Radius)/$(\pi \times {\rm Temperature})$. We further comment on the physical interpretation of this coincidence and the corresponding holographic interpretation of black hole echoes.