Mediaspace scheduled maintenance: Aug 25, 2026 07:00 - 12:00 AM. During this time, videos will be temporarily unavailable. Check status updates.

Lecture

Gravitational Red-Shift and Escape Velocity

In courses (2)

PHYS-427: Relativity and cosmology I

Introduce the students to general relativity and its classical tests. ...

PHYS-428: Relativity and cosmology II

This course is the basic introduction to modern cosmology. It introduces students to the main concepts and formalism of cosmology, the observational status of Hot Big Bang theory and discusses major physical processes in the early Universe. ...

Description

This lecture covers the discovery of integrals of motion, equations of motion in spherically symmetric metric, escape velocity, and gravitational red-shift. It also delves into the analysis of radial motion, singularity, and the mechanism for black hole production.

Instructor

Victor Gorbenko

Official source

Ontological neighbourhood

Astronomy

Astrophysics: Physical cosmology, Stellar astronomy

Related concepts (32)

Circular motion

In physics, circular motion is a movement of an object along the circumference of a circle or rotation along a circular path. It can be uniform, with a constant angular rate of rotation and constant speed, or non-uniform with a changing rate of rotation. The rotation around a fixed axis of a three-dimensional body involves the circular motion of its parts. The equations of motion describe the movement of the center of mass of a body. In circular motion, the distance between the body and a fixed point on the surface remains the same.

Event horizon

In astrophysics, an event horizon is a boundary beyond which events cannot affect an observer. Wolfgang Rindler coined the term in the 1950s. In 1784, John Michell proposed that gravity can be strong enough in the vicinity of massive compact objects that even light cannot escape. At that time, the Newtonian theory of gravitation and the so-called corpuscular theory of light were dominant. In these theories, if the escape velocity of the gravitational influence of a massive object exceeds the speed of light, then light originating inside or from it can escape temporarily but will return.

Micro black hole

Micro black holes, also called mini black holes or quantum mechanical black holes, are hypothetical tiny (

Gravitational redshift

In physics and general relativity, gravitational redshift (known as Einstein shift in older literature) is the phenomenon that electromagnetic waves or photons travelling out of a gravitational well (seem to) lose energy. This loss of energy corresponds to a decrease in the wave frequency and increase in the wavelength, known more generally as a redshift. The opposite effect, in which photons (seem to) gain energy when travelling into a gravitational well, is known as a gravitational blueshift (a type of blueshift).

Gravitational wave

Gravitational waves are waves of the intensity of gravity that are generated by the accelerated masses of an orbital binary system, and propagate as waves outward from their source at the speed of light. They were first proposed by Oliver Heaviside in 1893 and then later by Henri Poincaré in 1905 as waves similar to electromagnetic waves but the gravitational equivalent. Gravitational waves were later predicted in 1916 by Albert Einstein on the basis of his general theory of relativity as ripples in spacetime.

Related lectures (35)

Holography in Classical Gravity

Explores hints of holography in classical black hole thermodynamics.

Gravitational Waves: Observations and Implications

Explores the detection of gravitational waves, focusing on the first observation of a binary black hole merger and its implications for astrophysics.

Primordial Black Holes and Gravitational Wave Observations

Explores Primordial Black Holes, their formation, gravitational wave signatures, constraints on abundance, and future detection prospects.

Gravitational Field Equations

Covers the formulation of gravitational field equations and the motion of particles in gravitational fields.

Astroparticle Physics: Neutron Stars and Cosmic Rays

Explores neutron stars, supernova explosions, and their role in cosmic ray production.