* . *
  • About
  • Advertise
  • Privacy & Policy
  • Contact
Tuesday, July 1, 2025
Earth-News
  • Home
  • Business
  • Entertainment
    Nantucket Dance Festival opens July 8 – The Inquirer and Mirror

    Nantucket Dance Festival Launches with Thrilling Performances Beginning July 8

    A Secret Society, Ritualistic Killings, and a Century-Old Curse Netflix and YRF Entertainment’s ‘Mandala Murders’ Premieres July 25 – About Netflix

    A Secret Society, Ritualistic Killings, and a Century-Old Curse: Dive into the Chilling World of ‘Mandala Murders’ Premiering July 25

    Susquehanna Raises Penn Entertainment Inc. (PENN) Price Target. – Yahoo Finance

    Susquehanna Raises Price Target for Penn Entertainment Inc. (PENN)

    George Lopez is coming to Spokane – KXLY.com

    George Lopez is coming to Spokane – KXLY.com

    Netflix unveils Dallas immersive venue for fans of hit shows like ‘Squid Game,’ ‘Stranger Things’ – Houston Chronicle

    Step Inside Netflix’s New Dallas Immersive Experience Featuring Hits Like ‘Squid Game’ and ‘Stranger Things

    ‘Puttin’ on the Ritz’: Civic Players bring ‘Young Frankenstein’ to life – Yahoo

    Civic Players Deliver a Hilarious and Unforgettable Performance of ‘Young Frankenstein

  • General
  • Health
  • News

    Cracking the Code: Why China’s Economic Challenges Aren’t Shaking Markets, Unlike America’s” – Bloomberg

    Trump’s Narrow Window to Spread the Truth About Harris

    Trump’s Narrow Window to Spread the Truth About Harris

    Israel-Gaza war live updates: Hamas leader Ismail Haniyeh assassinated in Iran, group says

    Israel-Gaza war live updates: Hamas leader Ismail Haniyeh assassinated in Iran, group says

    PAP Boss to Niger Delta Youths, Stay Away from the Protest

    PAP Boss to Niger Delta Youths, Stay Away from the Protest

    Court Restricts Protests In Lagos To Freedom, Peace Park

    Court Restricts Protests In Lagos To Freedom, Peace Park

    Fans React to Jazz Jennings’ Inspiring Weight Loss Journey

    Fans React to Jazz Jennings’ Inspiring Weight Loss Journey

    Trending Tags

    • Trump Inauguration
    • United Stated
    • White House
    • Market Stories
    • Election Results
  • Science
  • Sports
  • Technology
    Owls inspire new revolutionary noise reduction technology – KTEN

    Owls inspire new revolutionary noise reduction technology – KTEN

    New center coming to Mizzou will focus on energy research and technology – Columbia Missourian

    Mizzou Launches Innovative New Center Dedicated to Energy Research and Technology

    Mirrors in space and underwater curtains: can technology buy us enough time to save the Arctic ice caps? – The Guardian

    Can Technology Like Space Mirrors and Underwater Curtains Buy Us Time to Save the Arctic Ice Caps?

    Naples restaurant owner prepares for hurricane season with new flood technology – Fox4Now.com

    Naples restaurant owner prepares for hurricane season with new flood technology – Fox4Now.com

    Emerging Memory and Storage Technology Market Analysis Report 2025-2034 | AI and HPC Boom Fuels Surging Demand for Fast, Low-Power Memory Devices – Yahoo Finance

    How AI and HPC Are Driving Explosive Growth in Fast, Low-Power Memory Technologies Through 2034

    Ostin Technology (OST): Volatility’s Warning or Contrarian Opportunity? – AInvest

    Ostin Technology (OST): Navigating Market Volatility – Red Flag or Hidden Opportunity?

    Trending Tags

    • Nintendo Switch
    • CES 2017
    • Playstation 4 Pro
    • Mark Zuckerberg
No Result
View All Result
  • Home
  • Business
  • Entertainment
    Nantucket Dance Festival opens July 8 – The Inquirer and Mirror

    Nantucket Dance Festival Launches with Thrilling Performances Beginning July 8

    A Secret Society, Ritualistic Killings, and a Century-Old Curse Netflix and YRF Entertainment’s ‘Mandala Murders’ Premieres July 25 – About Netflix

    A Secret Society, Ritualistic Killings, and a Century-Old Curse: Dive into the Chilling World of ‘Mandala Murders’ Premiering July 25

    Susquehanna Raises Penn Entertainment Inc. (PENN) Price Target. – Yahoo Finance

    Susquehanna Raises Price Target for Penn Entertainment Inc. (PENN)

    George Lopez is coming to Spokane – KXLY.com

    George Lopez is coming to Spokane – KXLY.com

    Netflix unveils Dallas immersive venue for fans of hit shows like ‘Squid Game,’ ‘Stranger Things’ – Houston Chronicle

    Step Inside Netflix’s New Dallas Immersive Experience Featuring Hits Like ‘Squid Game’ and ‘Stranger Things

    ‘Puttin’ on the Ritz’: Civic Players bring ‘Young Frankenstein’ to life – Yahoo

    Civic Players Deliver a Hilarious and Unforgettable Performance of ‘Young Frankenstein

  • General
  • Health
  • News

    Cracking the Code: Why China’s Economic Challenges Aren’t Shaking Markets, Unlike America’s” – Bloomberg

    Trump’s Narrow Window to Spread the Truth About Harris

    Trump’s Narrow Window to Spread the Truth About Harris

    Israel-Gaza war live updates: Hamas leader Ismail Haniyeh assassinated in Iran, group says

    Israel-Gaza war live updates: Hamas leader Ismail Haniyeh assassinated in Iran, group says

    PAP Boss to Niger Delta Youths, Stay Away from the Protest

    PAP Boss to Niger Delta Youths, Stay Away from the Protest

    Court Restricts Protests In Lagos To Freedom, Peace Park

    Court Restricts Protests In Lagos To Freedom, Peace Park

    Fans React to Jazz Jennings’ Inspiring Weight Loss Journey

    Fans React to Jazz Jennings’ Inspiring Weight Loss Journey

    Trending Tags

    • Trump Inauguration
    • United Stated
    • White House
    • Market Stories
    • Election Results
  • Science
  • Sports
  • Technology
    Owls inspire new revolutionary noise reduction technology – KTEN

    Owls inspire new revolutionary noise reduction technology – KTEN

    New center coming to Mizzou will focus on energy research and technology – Columbia Missourian

    Mizzou Launches Innovative New Center Dedicated to Energy Research and Technology

    Mirrors in space and underwater curtains: can technology buy us enough time to save the Arctic ice caps? – The Guardian

    Can Technology Like Space Mirrors and Underwater Curtains Buy Us Time to Save the Arctic Ice Caps?

    Naples restaurant owner prepares for hurricane season with new flood technology – Fox4Now.com

    Naples restaurant owner prepares for hurricane season with new flood technology – Fox4Now.com

    Emerging Memory and Storage Technology Market Analysis Report 2025-2034 | AI and HPC Boom Fuels Surging Demand for Fast, Low-Power Memory Devices – Yahoo Finance

    How AI and HPC Are Driving Explosive Growth in Fast, Low-Power Memory Technologies Through 2034

    Ostin Technology (OST): Volatility’s Warning or Contrarian Opportunity? – AInvest

    Ostin Technology (OST): Navigating Market Volatility – Red Flag or Hidden Opportunity?

    Trending Tags

    • Nintendo Switch
    • CES 2017
    • Playstation 4 Pro
    • Mark Zuckerberg
No Result
View All Result
Earth-News
No Result
View All Result
Home Science

The universe is expanding faster than theory predicts – physicists are searching for new ideas that might explain the mismatch

November 18, 2023
in Science
The universe is expanding faster than theory predicts – physicists are searching for new ideas that might explain the mismatch
Share on FacebookShare on Twitter

News

Science & Astronomy

swirls of various colors against the blackness of space

A field of distant galaxies captured by the James Webb Space Telescope.
(Image credit: NASA, ESA, CSA, and STScI)

This article was originally published at The Conversation. The publication contributed the article to Space.com’s Expert Voices: Op-Ed & Insights.

Ryan Keeley is a Postdoctoral Scholar in Physics, University of California, Merced.

Astronomers have known for decades that the universe is expanding. When they use telescopes to observe faraway galaxies, they see that these galaxies are moving away from Earth.

To astronomers, the wavelength of light a galaxy emits is longer the faster the galaxy is moving away from us. The farther away the galaxy is, the more its light has shifted toward the longer wavelengths on the red side of the spectrum – so the higher the “redshift.”

Because the speed of light is finite, fast, but not infinitely fast, seeing something far away means we’re looking at the thing how it looked in the past. With distant, high-redshift galaxies, we’re seeing the galaxy when the universe was in a younger state. So “high redshift” corresponds to the early times in the universe, and “low redshift” corresponds to the late times in the universe.

But as astronomers have studied these distances, they’ve learned that the universe is not just expanding – its rate of expansion is accelerating. And that expansion rate is even faster than the leading theory predicts it should be, leaving cosmologists like me puzzled and looking for new explanations.

Related: ‘Hubble trouble’ could deepen with new measurement of the universe’s expansion

Dark energy and a cosmological constant

Scientists call the source of this acceleration dark energy. We’re not quite sure what drives dark energy or how it works, but we think its behavior could be explained by a cosmological constant, which is a property of spacetime that contributes to the expansion of the universe.

Albert Einstein originally came up with this constant – he marked it with a lambda in his theory of general relativity. With a cosmological constant, as the universe expands, the energy density of the cosmological constant stays the same.

Imagine a box full of particles. If the volume of the box increases, the density of particles would decrease as they spread out to take up all the space in the box. Now imagine the same box, but as the volume increases, the density of the particles stays the same.

It doesn’t seem intuitive, right? That the energy density of the cosmological constant does not decrease as the universe expands is, of course, very weird, but this property helps explain the accelerating universe.

A standard model of cosmology

Right now, the leading theory, or standard model, of cosmology is called “Lambda CDM.’ Lambda denotes the cosmological constant describing dark energy, and CDM stands for cold dark matter. This model describes both the acceleration of the universe in its late stages as well as the expansion rate in its early days.

Specifically, the Lambda CDM explains observations of the cosmic microwave background, which is the afterglow of microwave radiation from when the universe was in a “hot, dense state” about 300,000 years after the Big Bang. Observations using the Planck satellite, which measures the cosmic microwave background, led scientists to create the Lambda CDM model.

Fitting the Lambda CDM model to the cosmic microwave background allows physicists to predict the value of the Hubble constant, which isn’t actually a constant but a measurement describing the universe’s current expansion rate.

But the Lambda CDM model isn’t perfect. The expansion rate scientists have calculated by measuring distances to galaxies, and the expansion rate as described in Lambda CDM using observations of the cosmic microwave background, don’t line up. Astrophysicists call that disagreement the Hubble tension.

an illustration demonstrating the expansion of the universe; on the left is a bright light indicating the Big Bang. a cone-shaped map of galaxies extends outward to the right, growing in diameter

The universe is expanding faster than predicted by popular models in cosmology.  (Image credit: NASA)

The Hubble tension

Over the past few years, I’ve been researching ways to explain this Hubble tension. The tension may be indicating that the Lambda CDM model is incomplete and physicists should modify their model, or it could indicate that it’s time for researchers to come up with new ideas about how the universe works. And new ideas are always the most exciting things for a physicist.

One way to explain the Hubble tension is to modify the Lambda CDM model by changing the expansion rate at low redshift, at late times in the universe. Modifying the model like this can help physicists predict what sort of physical phenomena might be causing the Hubble tension.

For instance, maybe dark energy is not a cosmological constant but instead the result of gravity working in new ways. If this is the case, dark energy would evolve as the universe expands – and the cosmic microwave background, which shows what the universe looked like only a few years after its creation, would have a different prediction for the Hubble constant.

But, my team’s latest research has found that physicists can’t explain the Hubble tension just by changing the expansion rate in the late universe – this whole class of solutions falls short.

Developing new models

To study what types of solutions could explain the Hubble tension, we developed statistical tools that enabled us to test the viability of the entire class of models that change the expansion rate in the late universe. These statistical tools are very flexible, and we used them to match or mimic different models that could potentially fit observations of the universe’s expansion rate and might offer a solution to the Hubble tension.

The models we tested include evolving dark energy models, where dark energy acts differently at different times in the universe. We also tested interacting dark energy-dark matter models, where dark energy interacts with dark matter, and modified gravity models, where gravity acts differently at different times in the universe.

But none of these could fully explain the Hubble tension. These results suggest that physicists should study the early universe to understand the source of the tension.

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Join our Space Forums to keep talking space on the latest missions, night sky and more! And if you have a news tip, correction or comment, let us know at: [email protected].

Breaking space news, the latest updates on rocket launches, skywatching events and more!

I do research in the fields of both astroparticle physics and cosmology, and I specifically focus on developing statistical tools to test LambdaCDM, a theory known as the standard model of cosmology. As a cosmologist, I use observations of astrophysical systems, like galaxies, to test our understanding of the fundamental laws of physics. As an astroparticle physicist, I work to identify the particle nature of dark matter and how it might interact with the standard model of particle physics. I’ve worked on developing tests of dark matter, dark energy, inflation, and modified gravity.

I am am a postdoctoral researcher at the University of California, Merced working with Anna Nierenberg. I also have an associate member status at the Center for the Gravitational-Wave Universe. I was a postdoctoral researcher studying cosmology at the Korea Astronomy Space Science Institute with Arman Shafieloo. Previously, I earned my PhD at UC Irvine working with Kevork Abazajian and also collaborating with Manoj Kaplinghat.

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : Space.com – https://www.space.com/universe-expanding-faster-than-theory-physicists-new-ideas

Tags: expandingscienceuniverse
Previous Post

Quantum chemistry experiment on ISS creates exotic 5th state of matter

Next Post

SpaceX launches 23 Starlink satellites on 1st of back-to-back missions this weekend

He’s searching for a human-made problem in areas largely untouched by humans. Answers are just emerging – CNN

He’s searching for a human-made problem in areas largely untouched by humans. Answers are just emerging – CNN

July 1, 2025
Asteroid 2024 YR4 might smash into the moon – Popular Science

Urgent Alert: Asteroid 2024 YR4 Headed Straight for the Moon!

July 1, 2025
These 9 towns were named the ‘quirkiest’ in New Jersey, according to World Atlas – Bergen Record

These 9 towns were named the ‘quirkiest’ in New Jersey, according to World Atlas – Bergen Record

July 1, 2025
Trump’s Tax Bill Won’t Help or Hurt the Economy. The Deficit Is Already Huge. – Barron’s

Trump’s Tax Bill Won’t Help or Hurt the Economy. The Deficit Is Already Huge. – Barron’s

July 1, 2025
Nantucket Dance Festival opens July 8 – The Inquirer and Mirror

Nantucket Dance Festival Launches with Thrilling Performances Beginning July 8

July 1, 2025
Who would be affected by health care cuts in Senate version of Trump’s budget bill – PBS

Who Will Be Hit Hardest by Health Care Cuts in the Senate’s Trump Budget Plan?

July 1, 2025
Senate passes Trump’s reconciliation bill with Vance casting tie-breaking vote – PBS

Senate Passes Trump’s Reconciliation Bill After Vance Casts Decisive Tie-Breaking Vote

July 1, 2025
Groundbreaking technology to help police tackle violence against women – The Independent

Revolutionary Technology Transforms the Fight Against Violence Toward Women

July 1, 2025
Apple Inc. (AAPL) Adds Tennis To Its List of Supported Sports Ahead of Wimbledon – Yahoo Finance

Apple Inc. (AAPL) Adds Tennis To Its List of Supported Sports Ahead of Wimbledon – Yahoo Finance

July 1, 2025
Nature’s headlamps: A unique light-focusing structure in Parasesarma de Man, 1895 mangrove crabs – ESA Journals

Nature’s headlamps: A unique light-focusing structure in Parasesarma de Man, 1895 mangrove crabs – ESA Journals

July 1, 2025

Categories

Archives

July 2025
MTWTFSS
 123456
78910111213
14151617181920
21222324252627
28293031 
« Jun    
Earth-News.info

The Earth News is an independent English-language daily published Website from all around the World News

Browse by Category

  • Business (20,132)
  • Ecology (701)
  • Economy (726)
  • Entertainment (21,615)
  • General (15,657)
  • Health (9,766)
  • Lifestyle (731)
  • News (22,149)
  • People (727)
  • Politics (733)
  • Science (15,944)
  • Sports (21,223)
  • Technology (15,710)
  • World (707)

Recent News

He’s searching for a human-made problem in areas largely untouched by humans. Answers are just emerging – CNN

He’s searching for a human-made problem in areas largely untouched by humans. Answers are just emerging – CNN

July 1, 2025
Asteroid 2024 YR4 might smash into the moon – Popular Science

Urgent Alert: Asteroid 2024 YR4 Headed Straight for the Moon!

July 1, 2025
  • About
  • Advertise
  • Privacy & Policy
  • Contact

© 2023 earth-news.info

No Result
View All Result

© 2023 earth-news.info

No Result
View All Result

© 2023 earth-news.info

Go to mobile version