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Detection of Black Holes01:10

Detection of Black Holes

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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...
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The Wave Nature of Light02:12

The Wave Nature of Light

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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. 
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Schwarzschild Radius and Event Horizon01:21

Schwarzschild Radius and Event Horizon

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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...
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Momentum And Radiation Pressure01:20

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An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because electromagnetic waves contain and transport momentum. The force accounts for the wave's radiation pressure exerted on the object. Maxwell's prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures with a torsion balance. The measuring instrument had mirrors suspended from a fiber kept inside a glass container.
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What is Matter?01:13

What is Matter?

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The substance of the universe—from a grain of sand to a star—is called matter. Scientists define matter as anything that occupies space and has mass. An object’s mass and its weight are related concepts, but not quite the same. An object’s mass is the amount of matter contained in the object and is the same whether that object is on Earth or in the zero-gravity environment of outer space. An object’s weight, on the other hand, is its mass as affected by the pull of...
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Collisions in Multiple Dimensions: Introduction01:05

Collisions in Multiple Dimensions: Introduction

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It is far more common for collisions to occur in two dimensions; that is, the initial velocity vectors are neither parallel nor antiparallel to each other. Let's see what complications arise from this. The first idea is that momentum is a vector. Like all vectors, it can be expressed as a sum of perpendicular components (usually, though not always, an x-component and a y-component, and a z-component if necessary). Thus, when the statement of conservation of momentum is written for a...
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Related Experiment Video

Updated: Jun 27, 2025

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

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Dark Matter and Mirror World.

Rabindra N Mohapatra1

  • 1Maryland Center for Fundamental Physics, Department of Physics, University of Maryland, College Park, MD 20742, USA.

Entropy (Basel, Switzerland)
|April 26, 2024
PubMed
Summary
This summary is machine-generated.

Dark matter may exist in a parallel mirror universe. This model explains dark matter abundance and requires the mirror world to be colder than ours, setting an upper limit on the universe's inflation reheat temperature.

Keywords:
asymmetric inflationhelium dominated mirror sectormatter–dark matter coincidencemirror world

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Last Updated: Jun 27, 2025

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Area of Science:

  • Cosmology
  • Particle Physics
  • Astrophysics

Background:

  • Astronomical evidence suggests dark matter, yet laboratory searches yield no results.
  • Speculation proposes dark matter resides in a parallel universe interacting gravitationally.

Purpose of the Study:

  • To explore a mirror world model for dark matter.
  • To investigate the implications of mirror symmetry for cosmology.
  • To explain the matter-dark matter coincidence problem.

Main Methods:

  • Postulating a mirror world with identical forces and matter.
  • Analyzing mirror model requirements for Big Bang nucleosynthesis.
  • Deriving constraints from mirror world coldness and matter-dark matter coincidence.

Main Results:

  • The mirror world model provides a candidate for dark matter.
  • Consistency implies an upper bound of ~10^6.5 GeV on inflation reheat temperature.
  • Mirror world likely consists of Helium, not Hydrogen, contrasting with the visible universe.

Conclusions:

  • The mirror world hypothesis offers a potential solution to the dark matter puzzle.
  • The model connects dark matter properties to early universe conditions.
  • Further research into mirror matter interactions and cosmological implications is warranted.