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Detecting a Long-Lived False Vacuum with Quantum Quenches
Gianluca Lagnese1,2,3, Federica Maria Surace4, Sid Morampudi5
1<a href="https://ror.org/04zaypm56">Institute of Polar Sciences CNR</a>, Via Torino 155, 30172 Mestre-Venezia, Italy.
Physical Review Letters
|January 3, 2025
Summary
Researchers found a way to distinguish between true and false vacuum states using short-term physical phenomena. This method, applied to a quantum Ising model, analyzes magnetization changes after a quench to identify system stability.
Area of Science:
- Condensed Matter Physics
- Quantum Field Theory
- Cosmology
Background:
- Distinguishing between stable (true vacuum) and metastable (false vacuum) states is challenging due to potentially long lifetimes.
- Direct observation is often impractical for determining the stability of low-energy states in complex systems.
- Understanding vacuum stability is crucial for fundamental physics and cosmology.
Purpose of the Study:
- To demonstrate a method for diagnosing true versus false vacuum states on shorter timescales.
- To identify physical phenomena that can serve as effective diagnostics for vacuum stability.
- To explore the implications for understanding the potential metastable vacuum of our universe.
Main Methods:
- Studied the time evolution of magnetization following a quench in a tractable model system: the tilted quantum Ising model.
- Analyzed the magnitude spectrum of magnetization dynamics as a diagnostic tool.
- Investigated the behavior of transition bubbles and their lifetimes as a function of size.
Main Results:
- The magnitude spectrum of magnetization dynamics effectively diagnoses the difference between true and false vacuum states.
- Observed characteristic differences in the size dependence of bubble lifetimes, even below the critical size for decay.
- Confirmed that these signatures persist in a continuum field theory, suggesting generality.
Conclusions:
- Short-timescale physical phenomena, specifically magnetization dynamics, can reliably distinguish between stable and metastable vacuum states.
- The observed behavior is expected to be generic in similar systems.
- This diagnostic approach may offer insights into the stability of our universe's potential false vacuum long before any decay.
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