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Related Experiment Video

Updated: Dec 24, 2025

Light-Induced In Situ Transmission Electron Microscopy for Observation of the Liquid-Soft Matter Interaction

Light-Induced In Situ Transmission Electron Microscopy for Observation of the Liquid-Soft Matter Interaction

Published on: July 26, 2022

Stock markets: A view from soft matter.

Antonio M Puertas¹, Miguel A Sánchez-Granero², Joaquim Clara-Rahola³

¹Departamento de Física Aplicada, Universidad de Almería, 04.120 Almería, Spain.

Physical Review. E

|April 16, 2020

Summary

Financial markets exhibit complex dynamics, not just simple Brownian motion. Stock price analysis reveals similarities to undercooled systems, suggesting intricate collective behaviors beyond ideal gas models.

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Area of Science:

Quantitative Finance
Statistical Mechanics
Soft Matter Physics

Background:

Existing literature shows attempts to model financial markets using statistical mechanics, but a comprehensive framework is lacking.
Understanding stock price behavior is crucial for financial market analysis and economic stability.

Purpose of the Study:

To apply many-particle system physics and soft matter concepts to analyze US and European stock market data.
To investigate the structure and dynamics of stock prices, comparing them to physical systems.

Main Methods:

Analysis of US and European stock price data, focusing on stable companies.
Correction for center-of-mass motion and non-uniform price distribution.
Utilized mean-squared price displacement (MSPD), price correlation functions, fluctuation distributions, and collective motion parameters.

Main Results:

Stock pair distribution near 1 suggests no direct interaction, akin to an ideal gas.
MSPD grows linearly, and velocity autocorrelation is zero, resembling isolated Brownian particles.
Intermediate scattering function shows stretched exponential decay, fluctuation distributions are non-Gaussian, and collective motions are significant, indicating complexity beyond ideal Brownian motion.

Conclusions:

Stock market dynamics are more complex than an ideal gas of Brownian particles, showing similarities to undercooled systems.
Physical system analogies, such as colloidal gels and ideal stars, help explain observed stock dynamics and structure.