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

Pulse amplitude and quality

Pulse amplitude and quality

Pulse amplitude is a crucial indicator of cardiac health because it provides valuable insights into the strength of left ventricular contractions and the overall uniformity of blood circulation within the vasculature. The strength of the pulse is directly related to the force with which the heart contracts and the volume of blood being pumped.
A weak or absent pulse may indicate reduced cardiac output or poor left ventricular contraction, which can be signs of cardiovascular dysfunction or...

Scatter Plot

Scatter Plot

The most common and easiest way to display the relationship between two variables, x and y, is a scatter plot. A scatter plot shows the direction of a relationship between the variables. A clear direction happens when there is either:

The Wave Nature of Light

The Wave Nature of Light

The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.

$Interference and Diffraction$ 02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.

Colloids

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...

Anatomy of Chloroplasts

Anatomy of Chloroplasts

Green algae and plants, including green stems and unripe fruit, harbor chloroplasts—the vital organelles where photosynthesis takes place. In plants, the highest density of chloroplasts is found in the mesophyll cells of leaves.

You might also read

Related Articles

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

Sort by

Same author

A practical approach to Cardiopulmonary Exercise Testing: from functional evaluation to adapted exercise prescription.

European journal of preventive cardiology·2026

Same author

Exercise training for cardiovascular prevention in patients with cancer.

European heart journal·2026

Same author

Inspiratory muscle training as part of multimodal prehabilitation improves maximal inspiratory pressure in elderly surgical patients: an exploratory secondary analysis of a randomised controlled trial.

BMC geriatrics·2026

Same author

Performance patterns and records in the world aquatics masters championships: Where do the most frequently represented nations among the top-ten masters swimmers come from?

PloS one·2026

Same author

Cardiorespiratory Exercise Intensity Prescription in Cardiovascular Rehabilitation: Do Updated Guideline Recommendations Reflect Real Individual Effort Responses?

European journal of preventive cardiology·2026

Same author

How AI is reshaping discovery in maths and physics.

Nature·2026

Search research articles

Related Experiment Video

Updated: Feb 5, 2026

Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Traintracks through Calabi-Yau Manifolds: Scattering Amplitudes beyond Elliptic Polylogarithms.

Jacob L Bourjaily¹, Yang-Hui He^2,3,4, Andrew J McLeod¹

¹Niels Bohr International Academy and Discovery Center, Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100, Copenhagen Ø, Denmark.

Physical Review Letters

|September 1, 2018

Summary

We introduce Feynman integrals crucial for quantum field theory calculations. These integrals, linked to Calabi-Yau manifolds, are essential for representing amplitudes in theories like maximally supersymmetric Yang-Mills.

More Related Videos

Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering

Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering

Published on: December 21, 2017

Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Published on: April 25, 2019

Related Experiment Videos

Last Updated: Feb 5, 2026

Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering

Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering

Published on: December 21, 2017

Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Published on: April 25, 2019

Area of Science:

Theoretical Physics
High Energy Physics
String Theory

Background:

Feynman integrals are fundamental in quantum field theory for calculating scattering amplitudes.
Elliptically fibered varieties and Calabi-Yau manifolds are advanced geometric objects with connections to theoretical physics.

Purpose of the Study:

To describe a new family of finite, four-dimensional, L-loop Feynman integrals.
To connect these integrals to specific geometric structures, namely Calabi-Yau manifolds.

Main Methods:

Integration of weight-(L+1) hyperlogarithms over (L-1)-dimensional elliptically fibered varieties.
Explicit identification of the K3 manifold at three loops.
Providing evidence for a Calabi-Yau threefold at four loops.

Main Results:

A family of L-loop Feynman integrals is characterized.
The geometric interpretation involves Calabi-Yau manifolds, specifically K3 at three loops and a Calabi-Yau threefold at four loops.
These integrals are demonstrated to be necessary for amplitude representation in various theories.

Conclusions:

The study establishes a novel class of Feynman integrals with deep connections to algebraic geometry.
These findings are relevant for understanding amplitudes in diverse quantum field theories, including maximally supersymmetric Yang-Mills theory.