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

Schwarzschild Radius and Event Horizon01:21

Schwarzschild Radius and Event Horizon

2.2K
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...
2.2K
Detection of Black Holes01:10

Detection of Black Holes

1.7K
Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
1.7K
Gravitational Potential Energy for Extended Objects01:07

Gravitational Potential Energy for Extended Objects

1.7K
Consider a system comprising several point masses. The coordinates of the center of mass for this system can be expressed as the summation of the product of each mass and its position vector divided by the total mass:
1.7K
Singularity Functions for Shear01:26

Singularity Functions for Shear

546
In structural analysis, singularity functions are crucial in simplifying the representation of shear forces in beams under discontinuous loading. These functions describe discontinuous variations in shear force across a beam with varying loads by using a single mathematical expression, regardless of the complexity of the loading conditions. The singularity functions are derived from creating a free-body diagram of the beam and then making conceptual cuts at specific points to examine the shear...
546
Singularity Functions for Bending Moment01:18

Singularity Functions for Bending Moment

709
Singularity functions simplify the representation of bending moments in beams subjected to discontinuous loading, allowing the use of a single mathematical expression. For a supported beam AB, with uniform loading from its midpoint M to the right side end B, the approach involves conceptual 'cuts' at specific points to determine the bending moment in each segment. By cutting the beam at a point between A and M, the bending moment for the segment before reaching midpoint M is represented using a...
709
Deflection of a Beam01:19

Deflection of a Beam

970
Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
Singularity functions, described in an earlier lesson, are powerful mathematical tools that represent discontinuities within a function commonly encountered in structural loading...
970

You might also read

Related Articles

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

Sort by
Same author

Perfect Quantum Cosmological Bounce.

Physical review letters·2016
Same author

Cosmology from group field theory formalism for quantum gravity.

Physical review letters·2013
Same author

Naturalness of CP violation in the standard model.

Physical review letters·2009
See all related articles

Related Experiment Video

Updated: May 4, 2026

Setting Limits on Supersymmetry Using Simplified Models
07:46

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 16, 2013

8.2K

Black Hole Singularity Resolution in Unimodular Gravity from Unitarity.

Steffen Gielen1, Lucía Menéndez-Pidal2

  • 1University of Sheffield, School of Mathematical and Physical Sciences, Hicks Building, Hounsfield Road, Sheffield S3 7RH, United Kingdom.

Physical Review Letters
|March 28, 2025
PubMed
Summary

Quantum gravity resolves black hole singularities and horizons, replacing them with a nonsingular quantum region. Unitarity in unimodular gravity

More Related Videos

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp
09:58

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp

Published on: February 3, 2014

7.8K
Demonstration of a Hyperlens-integrated Microscope and Super-resolution Imaging
10:01

Demonstration of a Hyperlens-integrated Microscope and Super-resolution Imaging

Published on: September 8, 2017

7.4K

Related Experiment Videos

Last Updated: May 4, 2026

Setting Limits on Supersymmetry Using Simplified Models
07:46

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 16, 2013

8.2K
Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp
09:58

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp

Published on: February 3, 2014

7.8K
Demonstration of a Hyperlens-integrated Microscope and Super-resolution Imaging
10:01

Demonstration of a Hyperlens-integrated Microscope and Super-resolution Imaging

Published on: September 8, 2017

7.4K

Area of Science:

  • Theoretical physics
  • Quantum gravity
  • Cosmology

Background:

  • Classical black hole models feature singularities and horizons.
  • Unimodular gravity introduces a cosmological constant of motion.
  • Quantum effects are crucial for understanding black hole interiors.

Purpose of the Study:

  • Investigate the quantum dynamics of interior planar anti-de Sitter black holes.
  • Explore the implications of unitarity in unimodular gravity for black hole structure.
  • Determine if quantum effects can resolve classical singularities.

Main Methods:

  • Studied quantum dynamics in the context of unimodular gravity.
  • Applied the requirement of unitarity in a specific time coordinate.
  • Analyzed the behavior of spacetime in highly quantum regions.

Main Results:

  • Classical singularities and horizons are replaced by a nonsingular quantum region.
  • Semiclassical spacetime evolution is valid only in an intermediate region.
  • Unitarity in unimodular time necessitates singularity resolution for all black holes.

Conclusions:

  • Quantum dynamics, under unitarity in unimodular gravity, resolves black hole singularities.
  • The findings have implications for general black hole physics beyond the specific model studied.
  • A unified quantum description replaces classical notions of singularity and horizon.