Video Experimental Relacionado

Updated: Dec 20, 2025

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

Published on: July 30, 2020

Un censo de bariones en el Universo de ráfagas de radio rápidas localizadas

J-P Macquart¹, J X Prochaska^2,3, M McQuinn⁴

¹International Centre for Radio Astronomy Research, Curtin Institute of Radio Astronomy, Curtin University, Perth, Western Australia, Australia. J.Macquart@curtin.edu.au.

|May 29, 2020

Resumen

Los investigadores midieron el contenido bariónico del Universo utilizando ráfagas de radio rápidas (FRB). Este nuevo método cuenta con precisión los bariones ionizados, proporcionando una densidad cósmica consistente con otras mediciones cosmológicas.

Área de la Ciencia:

Cosmología
La astrofísica
El fondo cósmico de microondas

Sus antecedentes:

La mayor parte de la materia bariónica del Universo es difusa y difícil de detectar.
Los métodos anteriores como la espectroscopia de cuásares y los estudios de emisión de rayos X tienen limitaciones en la sensibilidad y el alcance.
Las técnicas existentes luchan para medir con precisión los bariones "invisibles" a través de volúmenes cósmicos.

Objetivo del estudio:

Para medir independientemente la densidad cósmica de bariones.
Desarrollar una nueva técnica para detectar la materia bariónica difusa.
Para tener en cuenta todos los bariones ionizados utilizando dispersión rápida de ráfagas de radio.

Principales métodos:

Utilizó la medida de dispersión de ráfagas rápidas de radio localizadas (FRB).
Determinó la densidad de la columna de electrones a lo largo de las líneas de visión de FRB.
Muestras de FRB existentes aumentadas con nuevas localizaciones en galaxias anfitrionas con desplazamientos al rojo conocidos.

Principales resultados:

Se obtiene una densidad cósmica de bariones de [Fórmula: ver texto].
Logró una medición consistente con el fondo cósmico de microondas y los valores de nucleosíntesis del Big Bang.
Se completó una muestra de FRB lo suficientemente grande como para tener en cuenta las variaciones de dispersión.

Conclusiones:

La dispersión rápida de ráfagas de radio ofrece un método confiable para medir la densidad cósmica de bariones.
Esta medición independiente corrobora los modelos cosmológicos existentes.
El estudio caracterizó con éxito la distribución de los bariones ionizados en el Universo.

Más Videos Relacionados

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

$Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene$ 08:44

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene

Published on: August 22, 2017

Videos de Conceptos Relacionados

Atomic Nuclei: Larmor Precession Frequency

Atomic Nuclei: Larmor Precession Frequency

The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...

Atomic Nuclei: Nuclear Spin State Population Distribution

Atomic Nuclei: Nuclear Spin State Population Distribution

Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.

Atomic Radii and Effective Nuclear Charge

Atomic Radii and Effective Nuclear Charge

The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.

Detection of Black Holes

Detection of Black Holes

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...

Fast Fourier Transform

Fast Fourier Transform

The Fast Fourier Transform (FFT) is a computational algorithm designed to compute the Discrete Fourier Transform (DFT) efficiently. By breaking down the calculations into smaller, manageable sections, the FFT significantly reduces the computational complexity involved. Direct computation of an N-point DFT requires N2 complex multiplications, whereas the FFT algorithm needs only (N/2)log⁡2N multiplications, offering a much faster performance.
The computational efficiency of the FFT becomes...

Distribution of Molecular Speeds

Distribution of Molecular Speeds

The motion of molecules in a gas is random in magnitude and direction for individual molecules, but a gas of many molecules has a predictable distribution of molecular speeds. This predictable distribution of molecular speeds is known as the Maxwell-Boltzmann distribution. The distribution of molecular speeds in liquids is comparable to that of gases but not identical and can help to understand the phenomenon of the boiling and vapor pressure of a liquid. Consider that a molecule requires a...