Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Entropy02:39

Entropy

30.5K
Salt particles that have dissolved in water never spontaneously come back together in solution to reform solid particles. Moreover, a gas that has expanded in a vacuum remains dispersed and never spontaneously reassembles. The unidirectional nature of these phenomena is the result of a thermodynamic state function called entropy (S). Entropy is the measure of the extent to which the energy is dispersed throughout a system, or in other words, it is proportional to the degree of disorder of a...
30.5K
Entropy and the Second Law of Thermodynamics01:20

Entropy and the Second Law of Thermodynamics

3.0K
The second law of thermodynamics can be stated quantitatively using the concept of entropy. Entropy is the measure of disorder of the system.
The relation  between entropy and disorder can be illustrated with the example of the phase change of ice to water. In ice, the molecules are located at specific sites giving a solid state, whereas, in a liquid form, these molecules are much freer to move. The molecular arrangement has therefore become more randomized. Although the change in average...
3.0K
The Second Law of Thermodynamics01:14

The Second Law of Thermodynamics

5.4K
In the quest to identify a property that may reliably predict the spontaneity of a process, a promising candidate has been identified: entropy. Scientists refer to the measure of randomness or disorder within a system as entropy. High entropy means high disorder and low energy. To better understand entropy, think of a student’s bedroom. If no energy or work were put into it, the room would quickly become messy. It would exist in a very disordered state, one of high entropy. Energy must be...
5.4K
Entropy Change in Reversible Processes01:10

Entropy Change in Reversible Processes

2.7K
In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
2.7K
Second Law of Thermodynamics02:49

Second Law of Thermodynamics

24.1K
In the quest to identify a property that may reliably predict the spontaneity of a process, a promising candidate has been identified: entropy. Processes that involve an increase in entropy of the system (ΔS > 0) are very often spontaneous; however, examples to the contrary are plentiful. By expanding consideration of entropy changes to include the surroundings, a significant conclusion regarding the relation between this property and spontaneity may be reached. In thermodynamic...
24.1K
Third Law of Thermodynamics02:38

Third Law of Thermodynamics

19.3K
A pure, perfectly crystalline solid possessing no kinetic energy (that is, at a temperature of absolute zero, 0 K) may be described by a single microstate, as its purity, perfect crystallinity,and complete lack of motion means there is but one possible location for each identical atom or molecule comprising the crystal (W = 1). According to the Boltzmann equation, the entropy of this system is zero.
19.3K

You might also read

Related Articles

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

Sort by
Same author

CD4 <sup><b>+</b></sup> cell depletion accelerates dendritic cell migration and enhances resident dendritic cell proliferation in tumor-draining lymph nodes.

Oncoimmunology·2026
Same author

Pharmacogenomic profiling of the efficacy of gemcitabine monotherapy in metastatic pancreatic cancer: Subgroup analysis of the GENESECT study.

British journal of clinical pharmacology·2026
Same author

The Geriatric Nutritional Risk Index and pulmonary function predict non-esophageal cancer-related mortality after esophagectomy.

Esophagus : official journal of the Japan Esophageal Society·2026
Same author

Etiology and Management of Intraoperative Free Flap Failure.

Head & neck·2026
Same author

Analgesic Efficacy of Combinational Continuous Suprainguinal Fascia Iliaca Block and Pericapsular Nerve Group Block: A Retrospective Observational Study.

Anesthesiology research and practice·2025
Same author

Information scrambling in bosonic Gaussian dynamics.

Physical review. E·2025
Same journal

Erratum: Spectroscopy and Ground-State Transfer of Ultracold Bosonic ^{39}K^{133}Cs Molecules [Phys. Rev. Lett. 135, 203401 (2025)].

Physical review letters·2026
Same journal

Erratum: Lifetime of the ^{2}F_{7/2} Level in Yb^{+} for Spontaneous Emission of Electric Octupole Radiation [Phys. Rev. Lett. 127, 213001 (2021)].

Physical review letters·2026
Same journal

Laser-Plasma Based Seeded Free Electron Laser in the High-Gain Regime.

Physical review letters·2026
Same journal

Parent Hamiltonians for Stabilizer Quantum Many-Body Scars.

Physical review letters·2026
Same journal

Properties of Heavy Cosmic Nuclei Phosphorus, Chlorine, Argon, Potassium, and Calcium: Results from the Alpha Magnetic Spectrometer.

Physical review letters·2026
Same journal

Role of Spin-Isospin Symmetries in Nuclear β-Decays.

Physical review letters·2026
See all related articles

Related Experiment Video

Updated: Aug 10, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

8.5K

Pseudoentropy in dS/CFT and Timelike Entanglement Entropy.

Kazuki Doi1, Jonathan Harper1, Ali Mollabashi1

  • 1Center for Gravitational Physics, Yukawa Institute for Theoretical Physics, Kyoto University, Kitashirakawa Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan.

Physical Review Letters
|February 10, 2023
PubMed
Summary
This summary is machine-generated.

Holographic entanglement entropy in dS/CFT and timelike entanglement entropy in CFTs are complex pseudoentropies. Their imaginary parts reveal the emergence of time in dS/CFT, offering new insights into quantum gravity and spacetime.

More Related Videos

Applications of EEG Neuroimaging Data: Event-related Potentials, Spectral Power, and Multiscale Entropy
11:15

Applications of EEG Neuroimaging Data: Event-related Potentials, Spectral Power, and Multiscale Entropy

Published on: June 27, 2013

33.8K
Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
09:42

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

Published on: January 16, 2016

9.1K

Related Experiment Videos

Last Updated: Aug 10, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

8.5K
Applications of EEG Neuroimaging Data: Event-related Potentials, Spectral Power, and Multiscale Entropy
11:15

Applications of EEG Neuroimaging Data: Event-related Potentials, Spectral Power, and Multiscale Entropy

Published on: June 27, 2013

33.8K
Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
09:42

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

Published on: January 16, 2016

9.1K

Area of Science:

  • Theoretical Physics
  • Quantum Gravity
  • String Theory

Background:

  • Entanglement entropy quantifies quantum correlations in a system.
  • Holographic entanglement entropy (HEE) relates boundary theory entropy to bulk geometry in AdS/CFT.
  • dS/CFT correspondence extends holographic principles to de Sitter spacetime.

Purpose of the Study:

  • To introduce and study timelike entanglement entropy in Conformal Field Theories (CFTs).
  • To investigate the nature of holographic entanglement entropy in dS/CFT.
  • To establish a connection between these two concepts and their implications for spacetime.

Main Methods:

  • Introducing timelike entanglement entropy for CFTs.
  • Calculating holographic entanglement entropy in dS/CFT.
  • Utilizing analytical continuation to relate different entanglement measures.
  • Interpreting the results within the framework of pseudoentropy.

Main Results:

  • Both holographic entanglement entropy in dS/CFT and timelike entanglement entropy in CFTs generally yield complex values.
  • These complex values are related through analytical continuation.
  • The study argues for understanding these measures as pseudoentropy.
  • The imaginary part of pseudoentropy is shown to imply the emergence of time in dS/CFT.

Conclusions:

  • Timelike entanglement entropy and holographic entanglement entropy in dS/CFT are unified under the concept of pseudoentropy.
  • The imaginary component of pseudoentropy provides a novel mechanism for the emergence of time in de Sitter spacetime.
  • This work offers a new perspective on the interplay between quantum information and spacetime geometry in holographic contexts.