# A survey of spectral models of gravity coupled to matter

## TL;DR

This survey reviews the development of spectral models of gravity coupled with matter, highlighting the role of noncommutative geometry in unifying fundamental interactions and characterizing space-time at different energy scales.

## Contribution

It provides a comprehensive overview of the historical and theoretical progress in spectral models, emphasizing the uniqueness of the Spectral Standard Model and its extensions.

## Key findings

- Identification of noncommutative space underlying the Standard Model
- Demonstration of the uniqueness of the Spectral Standard Model at low energies
- Connection between noncommutative geometry and unification models like Pati-Salam

## Abstract

This is a survey of the historical development of the Spectral Standard Model and beyond, starting with the ground breaking paper of Alain Connes in 1988 where he observed that there is a link between Higgs fields and finite noncommutative spaces. We present the important contributions that helped in the search and identification of the noncommutative space that characterizes the fine structure of space-time. The nature and properties of the noncommutative space are arrived at by independent routes and show the uniqueness of the Spectral Standard Model at low energies and the Pati-Salam unification model at high energies.