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Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
Gauss's Law: Planar Symmetry01:27

Gauss's Law: Planar Symmetry

A planar symmetry of charge density is obtained when charges are uniformly spread over a large flat surface. In planar symmetry, all points in a plane parallel to the plane of charge are identical with respect to the charges. Suppose the plane of the charge distribution is the xy-plane, and the electric field at a space point P with coordinates (x, y, z) is to be determined. Since the charge density is the same at all (x, y) - coordinates in the z = 0 plane, by symmetry, the electric field at P...
Gauss's Law: Cylindrical Symmetry01:20

Gauss's Law: Cylindrical Symmetry

A charge distribution has cylindrical symmetry if the charge density depends only upon the distance from the axis of the cylinder and does not vary along the axis or with the direction about the axis. In other words, if a system varies if it is rotated around the axis or shifted along the axis, it does not have cylindrical symmetry. In real systems, we do not have infinite cylinders; however, if the cylindrical object is considerably longer than the radius from it that we are interested in,...
Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Space-Time Curvature and the General Theory of Relativity01:17

Space-Time Curvature and the General Theory of Relativity

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 motion,...
Gauss's Law: Spherical Symmetry01:26

Gauss's Law: Spherical Symmetry

A charge distribution has spherical symmetry if the density of charge depends only on the distance from a point in space and not on the direction. In other words, if the system is rotated, it doesn't look different. For instance, if a sphere of radius R is uniformly charged with charge density ρ0, then the distribution has spherical symmetry. On the other hand, if a sphere of radius R is charged so that the top half of the sphere has a uniform charge density ρ1 and the bottom half has a uniform...

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Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
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Una característica de fondo cósmico de microondas consistente con una textura cósmica.

M Cruz1, N Turok, P Vielva

  • 1Instituto de Física de Cantabria, Consejo Superior de Investigaciones Cientifícas Univ. de Cantabria, Avenida los Castros, 39005-Santander, Spain. cruz@ifca.unican.es

Science (New York, N.Y.)
|October 27, 2007
PubMed
Resumen
Este resumen es generado por máquina.

Una textura cósmica puede explicar el prominente punto frío en el Fondo Cósmico de Microondas (CMB). Este hallazgo, si se confirma, examina la física a energías extremadamente altas, más allá de los experimentos terrestres.

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Área de la Ciencia:

  • Cosmología Cosmología.
  • Física de altas energías Física de altas energías
  • La astrofísica es la astrofísica.

Sus antecedentes:

  • El Fondo Cósmico de Microondas (CMB, por sus siglas en inglés) ofrece información sobre el universo primitivo.
  • Las teorías predicen defectos topológicos como la textura cósmica formada en el universo temprano.
  • Estos defectos pueden crear variaciones de temperatura (puntos calientes y fríos) en el CMB.

Objetivo del estudio:

  • Para investigar el origen de una prominente mancha fría de radio de 5 grados en las imágenes de todo el cielo del CMB.
  • Para determinar si una textura cósmica podría ser responsable de esta anomalía observada.

Principales métodos:

  • Análisis estadístico bayesiano de los datos del CMB.
  • Modelado de los efectos de la textura cósmica en las fluctuaciones de temperatura del CMB.

Principales resultados:

  • La mancha fría observada es compatible con ser causada por una textura cósmica.
  • La escala de energía fundamental de ruptura de simetría está limitada a aproximadamente 8,7 x 1015 gigaelectronvoltios.

Conclusiones:

  • La detección de un defecto cósmico, si se confirma, proporciona evidencia para la física más allá del Modelo Estándar.
  • Este descubrimiento sondea escalas de energía que exceden con creces las alcanzadas por experimentos terrestres.