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

Torsional Pendulum01:09

Torsional Pendulum

7.6K
A torsional pendulum involves the oscillation of a rigid body in which the restoring force is provided by the torsion in the string from which the rigid body is suspended. Ideally, the string should be massless; practically, its mass is much smaller than the rigid body's mass and is neglected.
As long as the rigid body's angular displacement is small, its oscillation can be modeled as a linear angular oscillation. The amplitude of the oscillation is an angle. The role of mass is played...
7.6K
Space-Time Curvature and the General Theory of Relativity01:17

Space-Time Curvature and the General Theory of Relativity

4.7K
In 1905, Albert Einstein published his special theory of relativity. According to this theory, no matter in the universe can attain a speed greater than the speed of light in a vacuum, which thus serves as the speed limit of the universe.
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of...
4.7K
Symmetry in Maxwell's Equations01:28

Symmetry in Maxwell's Equations

4.3K
Once the fields have been calculated using Maxwell's four equations, the Lorentz force equation gives the force that the fields exert on a charged particle moving with a certain velocity. The Lorentz force equation combines the force of the electric field and of the magnetic field on the moving charge. Maxwell's equations and the Lorentz force law together encompass all the laws of electricity and magnetism. The symmetry that Maxwell introduced into his mathematical framework may not be...
4.3K
Simple Pendulum01:10

Simple Pendulum

8.3K
A simple pendulum consists of a small diameter ball suspended from a string, which has negligible mass but is strong enough to not stretch. In our daily life, pendulums have many uses, such as in clocks, on a swing set, and on a sinker on a fishing line. 
The period of a simple pendulum depends on two factors: its length and the acceleration due to gravity. The period is completely independent of any other factors, such as mass or maximum displacement. For small displacements, a pendulum is...
8.3K
Modes of Standing Waves - I01:03

Modes of Standing Waves - I

4.2K
A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
4.2K
Torque Free Motion01:15

Torque Free Motion

890
The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...
890

You might also read

Related Articles

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

Sort by
Same author

Tensor modes from a primordial Hagedorn phase of string cosmology.

Physical review letters·2007
Same author

Producing a scale-invariant spectrum of perturbations in a Hagedorn phase of string cosmology.

Physical review letters·2006
See all related articles

Related Experiment Video

Updated: Mar 3, 2026

Setting Limits on Supersymmetry Using Simplified Models
07:46

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

9.0K

New Nonsupersymmetric Tachyon-Free Strings.

Zihni Kaan Baykara1, Houri-Christina Tarazi2,3, Cumrun Vafa1

  • 1Harvard University, Department of Physics, Cambridge, Massachusetts MA02138, USA.

Physical Review Letters
|March 1, 2026
PubMed
Summary

Researchers developed new nonsupersymmetric tachyon-free string theories. These theories, built using asymmetric orbifolds, are lower-dimensional versions of the O(16)×O(16) string, featuring unique properties like a single neutral scalar.

More Related Videos

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

10.4K
Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
04:51

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Published on: July 8, 2021

3.2K

Related Experiment Videos

Last Updated: Mar 3, 2026

Setting Limits on Supersymmetry Using Simplified Models
07:46

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

9.0K
Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

10.4K
Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
04:51

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Published on: July 8, 2021

3.2K

Area of Science:

  • String Theory
  • High Energy Physics
  • Theoretical Physics

Background:

  • Four decades of string theory research have yielded few nonsupersymmetric, tachyon-free string theories with a single neutral scalar at tree level.
  • Existing models often lack desired properties such as chiral matter or positive potentials.

Purpose of the Study:

  • To construct novel nonsupersymmetric tachyon-free string theories.
  • To create lower-dimensional counterparts to the O(16)×O(16) string.
  • To incorporate specific features like chiral matter and positive potentials.

Main Methods:

  • Utilizing asymmetric orbifolds for string theory construction.
  • Developing 4, 6, and 8-dimensional models.
  • Employing a quasicrystalline orbifold for the 4D construction.

Main Results:

  • Successfully constructed new nonsupersymmetric tachyon-free string theories.
  • Theories feature only one neutral scalar at tree level.
  • Models exhibit chiral matter and a positive leading order potential.
  • The 4D construction is based on a quasicrystalline orbifold.

Conclusions:

  • The developed asymmetric orbifold method provides a viable pathway to new string theories.
  • These new theories offer promising features for theoretical physics research.
  • The findings expand the landscape of known nonsupersymmetric string models.