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Related Concept Videos

Classical Mechanics01:12

Classical Mechanics

Classical mechanics provides a mathematical description of the motion of bodies under the influence of forces. A key principle within this field is the work-energy theorem, which establishes a bridge between the net work done on an object and its kinetic energy.The work-energy theorem states that the net work done on a particle by all the forces acting on it equals the change in its kinetic energy.In simple terms, the work-energy theorem is a method to analyze the effects of forces on an...
Schwarzschild Radius and Event Horizon01:21

Schwarzschild Radius and Event Horizon

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 velocity with the...
Newton's First Law: Introduction01:17

Newton's First Law: Introduction

Motion draws our attention. Motion itself can be beautiful, causing us to marvel at the forces needed to create spectacular sights, such as that of a dolphin jumping out of the water, the flight of a bird, or the orbit of a satellite. The study of motion is kinematics, but kinematics only describes the way objects move—their velocity and acceleration. Dynamics considers the forces that affect the motion of moving objects and systems. Newton's laws of motion are the foundation of dynamics. These...
The Wave Nature of Light02:12

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.
Kepler's First Law of Planetary Motion01:10

Kepler's First Law of Planetary Motion

In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. He formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe.
Polish astronomer Nikolaus Copernicus put forth a theory that stated a heliocentric model for the solar system. According to this heliocentric theory, all the planets, including Earth, orbit the Sun in circular orbits.
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The Scope of Physics

Physics is concerned with the interactions of energy, matter, space, and time, in order to discover the underlying mechanisms that underpin all phenomena. The word "physics" comes from the Greek word "phúsis", which means nature. Physics seeks to comprehend the natural world around us at its most fundamental level. It emphasizes the use of quantitative laws to do this, which could be valuable in other fields that want to push the performance boundaries of present technologies.
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Related Experiment Video

Updated: Jul 12, 2026

Bringing the Visible Universe into Focus with Robo-AO
10:35

Bringing the Visible Universe into Focus with Robo-AO

Published on: February 12, 2013

Windows on a new cosmology.

G Lake

    Science (New York, N.Y.)
    |May 18, 1984
    PubMed
    Summary

    New theories unifying fundamental forces may resolve Big Bang cosmology's fine-tuning problems. These models introduce inherent matter-antimatter asymmetry and alter early universe dynamics, potentially explaining observed homogeneity and the universe's longevity.

    Area of Science:

    • Cosmology
    • Particle Physics
    • Theoretical Physics

    Background:

    • Standard Big Bang cosmology necessitates fine-tuned initial conditions.
    • These include matter-antimatter asymmetry, precise expansion rate, and large-scale homogeneity.
    • These conditions are currently imposed as initial data.

    Purpose of the Study:

    • To explore how unified interaction theories can address fine-tuning problems in cosmology.
    • To investigate the potential for inherent matter-antimatter asymmetry in physical laws.
    • To examine the impact of new theories on the early universe's dynamic history.

    Main Methods:

    • Theoretical analysis of unified strong and electroweak interaction theories.
    • Investigating the implications of these theories for cosmological initial conditions.

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    Longitudinal Intravital Imaging Through Clear Silicone Windows

    Published on: January 5, 2022

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    Last Updated: Jul 12, 2026

    Bringing the Visible Universe into Focus with Robo-AO
    10:35

    Bringing the Visible Universe into Focus with Robo-AO

    Published on: February 12, 2013

    Longitudinal Intravital Imaging Through Clear Silicone Windows
    07:44

    Longitudinal Intravital Imaging Through Clear Silicone Windows

    Published on: January 5, 2022

  • Modeling the early universe's evolution under new physical laws.

    • Main Results:

    • Unified theories may introduce inherent matter-antimatter asymmetry.
    • These theories can alter the early dynamic history of the universe.
    • Potential to remove the need for special initial conditions in Big Bang cosmology.

    Conclusions:

    • New unified theories offer a compelling alternative to fine-tuning in Big Bang cosmology.
    • These models provide a framework for understanding the universe's observed properties through fundamental physics.
    • Further research into unified interactions is crucial for a complete cosmological model.