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Category: cosmology – Page 35

Research suggests dark matter may not exist, and the universe’s age is approximately 27 billion years, according to a recent study on Earth.com

The universe has always held mysteries that spark our curiosity. As we currently understand it, the fabric of the universe comprises three primary components: ‘normal matter,’ ‘dark energy,’ and ‘dark matter.’ However, new research is turning this established model on its head.

Enter Rajendra Gupta, a seasoned physics professor who isn’t afraid to question the status quo. With years of research under his belt, Gupta is shaking up our understanding of the universe.

Gupta, based at the University of Ottawa, conducted a study that suggests we might not need dark matter or dark energy to explain the workings of the universe. This bold claim is turning heads in the scientific community.

Continue reading “Dark matter does not exist and the universe is 27 billion years old, study claims” | >

Although our universe may seem stable, having existed for a whopping 13.7 billion years, several experiments suggest that it is at risk—walking on the edge of a very dangerous cliff. And it’s all down to the instability of a single fundamental particle: the Higgs boson.

In new research by me and my colleagues, just accepted for publication in Physical Letters B, we show that some models of the early universe, those which involve objects called light primordial black holes, are unlikely to be right because they would have triggered the Higgs boson to end the cosmos by now.

The Higgs boson is responsible for the mass and interactions of all the particles we know of. That’s because particle masses are a consequence of elementary particles interacting with a field, dubbed the Higgs field. Because the Higgs boson exists, we know that the field exists.

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The universe has always held mysteries that spark our curiosity. As we currently understand it, the fabric of the universe comprises three primary components: ‘normal matter,’ ‘dark energy,’ and ‘dark matter.’ However, new research is turning this established model on its head.

Enter Rajendra Gupta, a seasoned physics professor who isn’t afraid to question the status quo. With years of research under his belt, Gupta is shaking up our understanding of the universe.

Gupta, based at the University of Ottawa, conducted a study that suggests we might not need dark matter or dark energy to explain the workings of the universe. This bold claim is turning heads in the scientific community.

Read more | >

Despite its intensity, the gravitational collapse of certain massive stars does not produce an abundance of heavy elements.

About half of the elements heavier than iron are made by the r, or rapid, process. A nucleus captures neutrons so quickly that radioactive decay is forestalled until the neutron-heavy nucleus finally emits electrons and neutrinos and settles at a new, higher atomic number. Besides normal supernovae and neutron-star mergers, the r process is also suspected to occur in so-called collapsars. These are rapidly rotating massive stars that collapse without producing a regular supernova once they exhaust their fuel. However, simulations by Coleman Dean and Rodrigo Fernández of the University of Alberta, Canada, have now undermined that r-process conjecture [1].

A collapsar’s progenitor is massive enough that it forms a black hole. To shed its prodigious angular momentum, it also forms a thick, unstable accretion disk. During the collapse, nuclei in the stellar envelope break apart, and their protons combine with electrons in the envelope to produce neutrons and neutrinos in large numbers. These neutrons could turn the disk into a favorable, if fleeting, site for the r process to forge and disperse heavy elements—provided that this neutron-rich matter can be ejected.

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Using the James Webb Space Telescope, astronomers have for the first time observed a galaxy in the early universe growing from the inside out, a mere 700 million years after the Big Bang.

This galaxy, significantly smaller yet more mature than expected, demonstrates unique growth patterns with its dense core and rapidly forming star outskirts.

Astronomers have employed the NASA /ESA James Webb Space Telescope (JWST) to observe the ‘inside-out’ growth of a galaxy in the early universe, a mere 700 million years after the Big Bang.

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Some scientists believe black holes might be wormholes, offering shortcuts through space and time

A team of physicists from Sofia University in Bulgaria has proposed a fascinating theory that wormholes, hypothetical tunnels linking different parts of the universe, could be hiding in plain sight. These wormholes may resemble black holes so closely that current technology cannot distinguish between the two, according to a new study reported by New Scientist.

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Now in Quantum: by Antonio deMarti iOlius, Patricio Fuentes, Román Orús, Pedro M. Crespo, and Josu Etxezarreta Martinez https://doi.org/10.22331/q-2024-10-10-1498

Antonio deMarti iOlius1, Patricio Fuentes2, Román Orús3,4,5, Pedro M. Crespo1, and Josu Etxezarreta Martinez1

1Department of Basic Sciences, Tecnun — University of Navarra, 20,018 San Sebastian, Spain. 2 Photonic Inc., Vancouver, British Columbia, Canada. 3 Multiverse Computing, Pio Baroja 37, 20008 San Sebastián, Spain 4 Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 San Sebastián, Spain 5 IKERBASQUE, Basque Foundation for Science, Plaza Euskadi 5, 48009 Bilbao, Spain.

Get full text pdfRead on arXiv VanityComment on Fermat’s library.

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