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

Space-Time Curvature and the General Theory of Relativity01:17

Space-Time Curvature and the General Theory of Relativity

3.3K
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...
3.3K
Schwarzschild Radius and Event Horizon01:21

Schwarzschild Radius and Event Horizon

2.3K
No object with a finite mass can travel faster than the speed of light in a vacuum. This fact has an interesting consequence in the domain of extremely high gravitational fields.
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape...
2.3K
First Law: Particles in Two-dimensional Equilibrium01:18

First Law: Particles in Two-dimensional Equilibrium

6.9K
Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
Newton's first law tells us about...
6.9K
Gravity between Spherical Bodies01:27

Gravity between Spherical Bodies

8.7K
Newton's law of gravitation describes the gravitational force between any two point masses. However, for extended spherical objects like the Earth, the Moon, and other planets, the law holds with an assumption that masses of spherical objects are concentrated at their respective centers.
This assumption can be proved easily by showing that the expression for gravitational potential energy between a hollow sphere of mass (M) and a point mass (m) is the same as it would be for a pair of extended...
8.7K
Gravitation Between Spherically Symmetric Masses01:14

Gravitation Between Spherically Symmetric Masses

1.0K
The gravitational potential energy between two spherically symmetric bodies can be calculated from the masses and the distance between the bodies, assuming that the center of mass is concentrated at the respective centers of the bodies.
1.0K
Principle of Equivalence01:18

Principle of Equivalence

2.3K
According to Albert Einstein (1897-1955), free-falling and feeling weightless are intrinsically linked. If a person were in free-fall under gravity, for example, diving towards the Earth from an airplane, they would feel completely weightless. Similarly, a person descending in a lift may feel partially weightless. Broadly speaking, it is assumed that an object in a uniform gravitational field and an object undergoing constant acceleration in the absence of gravity are under the same...
2.3K

You might also read

Related Articles

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

Sort by
Same authorSame journal

3D Supergravity in the Batalin-Vilkovisky Formalism.

Annales Henri Poincare·2026
Same author

BV equivalence with boundary.

Letters in mathematical physics·2023
Same author

General Relativity and the AKSZ Construction.

Communications in mathematical physics·2021
Same author

Environmental complexity of a port: Evidence from circulation of the water masses, and composition and contamination of bottom sediments.

Marine pollution bulletin·2017
Same author

Evaluation of the boundary condition influence on PAH concentrations in the water column during the sediment dredging of a port.

Marine pollution bulletin·2015
Same author

[The concept of projection and its application to the study of personality].

Archivio di psicologia, neurologia e psichiatria·2014

Related Experiment Video

Updated: Oct 14, 2025

Setting Limits on Supersymmetry Using Simplified Models
07:46

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

8.7K

Gravitational Constraints on a Lightlike Boundary.

G Canepa1, A S Cattaneo1, M Tecchiolli1

  • 1Institut für Mathematik, Universität Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland.

Annales Henri Poincare
|November 1, 2021
PubMed
Summary
This summary is machine-generated.

Researchers analyzed general relativity

More Related Videos

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
12:14

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

22.0K
Reduced-gravity Environment Hardware Demonstrations of a Prototype Miniaturized Flow Cytometer and Companion Microfluidic Mixing Technology
13:59

Reduced-gravity Environment Hardware Demonstrations of a Prototype Miniaturized Flow Cytometer and Companion Microfluidic Mixing Technology

Published on: November 13, 2014

13.9K

Related Experiment Videos

Last Updated: Oct 14, 2025

Setting Limits on Supersymmetry Using Simplified Models
07:46

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

8.7K
The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
12:14

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

22.0K
Reduced-gravity Environment Hardware Demonstrations of a Prototype Miniaturized Flow Cytometer and Companion Microfluidic Mixing Technology
13:59

Reduced-gravity Environment Hardware Demonstrations of a Prototype Miniaturized Flow Cytometer and Companion Microfluidic Mixing Technology

Published on: November 13, 2014

13.9K

Area of Science:

  • Theoretical Physics
  • Gravitational Physics

Background:

  • General relativity describes gravity as spacetime curvature.
  • Boundary structures are crucial for understanding spacetime at its limits.
  • Coframe formalism offers a powerful framework for analyzing relativistic theories.

Purpose of the Study:

  • To analyze the boundary structure of general relativity.
  • To investigate the implications of a lightlike boundary.
  • To characterize the reduced phase space and its degrees of freedom.

Main Methods:

  • Analysis of general relativity in the coframe formalism.
  • Investigation of degenerate Lorentzian metrics on the boundary.
  • Characterization of constraints on the symplectic space of boundary fields.
  • Computation of Poisson brackets for constraint identification.

Main Results:

  • A lightlike boundary leads to a degenerate induced Lorentzian metric.
  • The reduced phase space is described by constraints on boundary fields.
  • First- and second-class constraints were explicitly computed.
  • In 3+1 dimensions, the reduced phase space has two local degrees of freedom, unlike the non-degenerate case.

Conclusions:

  • The study provides a detailed analysis of general relativity at a lightlike boundary.
  • The findings reveal a reduction in local degrees of freedom in the degenerate case.
  • This work contributes to a deeper understanding of spacetime structure and gravitational dynamics.