Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Quantum Numbers

Quantum Numbers

It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.

The Quantum-Mechanical Model of an Atom

The Quantum-Mechanical Model of an Atom

Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra. Schrödinger...

Subatomic Particles

Subatomic Particles

Dalton was only partially correct about the particles that make up matter. All matter is composed of atoms, and atoms are composed of three smaller subatomic particles: protons, neutrons, and electrons. These three particles account for the mass and the charge of an atom.

Interference and Decay

Interference and Decay

Forgetting is a complex cognitive phenomenon influenced by several factors, among which interference and decay are particularly prominent. These processes explain why individuals often struggle to retrieve specific information from memory, leading to lapses in recall that can be observed in everyday situations.
Interference occurs when competing memories hinder the retrieval of particular information. It can be classified into two types: proactive and retroactive interference. Proactive...

Atomic Nuclei: Nuclear Relaxation Processes

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis. This...

The de Broglie Wavelength

The de Broglie Wavelength

In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Therapeutic Drug Monitoring of Levetiracetam in Different Trimesters of Pregnant Women with Epilepsy in a Tertiary Care Center: A Prospective Study.

Neurology India·2024

Same author

Isolated pulmonary hydatid cyst.

BMJ case reports·2023

Same author

Correlation of fine needle aspiration cytology with histopathology in patients undergoing thyroid surgery.

Otolaryngologia polska = The Polish otolaryngology·2021

Same author

Failure of Flow Diverter Therapy: Predictors and Management Strategies.

Neurosurgery·2019

Same author

Acute Left M1 Stroke With Critical Left Internal Carotid Artery Stenosis: Video Case.

Neurosurgery·2019

Same author

The Continued Role and Value of Imaging for Acute Ischemic Stroke.

Neurosurgery·2019

Search research articles

Related Experiment Video

Updated: Jul 4, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Quantum bounce and cosmic recall.

Alejandro Corichi¹, Parampreet Singh

¹Instituto de Matemáticas, Unidad Morelia, Universidad Nacional Autónoma de México, UNAM-Campus Morelia, A. Postal 61-3, Morelia, Michoacán 58090, Mexico.

Physical Review Letters

|June 4, 2008

Summary

Loop quantum cosmology suggests a quantum bounce replaces the Big Bang. This study shows the universe largely remembers its previous state after the bounce, refuting cosmic amnesia theories.

Area of Science:

Cosmology
Quantum Gravity
Theoretical Physics

Background:

Loop quantum cosmology (LQC) proposes a quantum bounce as an alternative to the Big Bang singularity.
A key question is whether the universe retains information from its preceding phase after the quantum bounce.

Purpose of the Study:

To investigate whether the universe experiences "cosmic amnesia" or retains memory of its prior state after a quantum bounce.
To analyze the preservation of properties and semiclassicality through the bounce in an exactly solvable model.

Main Methods:

Utilized an exactly solvable model within loop quantum cosmology.
Analyzed the evolution of a semiclassical state through the quantum bounce.

Main Results:

More Related Videos

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Published on: September 8, 2023

Related Experiment Videos

Last Updated: Jul 4, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Published on: September 8, 2023

Demonstrated that a semiclassical state on one side of the bounce strongly constrains fluctuations on the other side.
Quantified the change in relative fluctuation across the bounce to be less than 10⁻⁵⁶ for a 1 megaparsec universe, decreasing for larger universes.

Conclusions:

The universe largely retains its properties and semiclassical nature after the quantum bounce, contradicting theories of cosmic amnesia.
The findings suggest a high degree of "cosmic recall" across the bounce in simple cosmological models.