Dogs are animals of integrity. We have much to learn from them.
Category: Communication
This came in from our neighbour, Dordie!
You will love it!
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This dog catching a fish while his owner is away.. Dogs are the best..
It was originally posted on ‘X’ by but then I found it on YouTube. However the text that was shown on X read:
Buitengebieden,
Welcome to the positive side of X. I’m Sander from the Netherlands. All copyrights belong to their respective owners! DM for credits/removal/submission!
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Wonderful! Thanks Dordie!
We pass from 2023 into 2024.
So here we are, 2024, and the year when I become 80! However, I still have eleven months before that happens. Like an amazing number of people, I do not really think long about this New Year but there are plenty that do.
Here is an article that explains much more. It is from The Conversation.
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Rosalyn R. LaPier, University of Montana
On the day of winter solstice, many Native American communities will hold religious ceremonies or community events.
The winter solstice is the day of the year when the Northern Hemisphere has the fewest hours of sunlight and the Southern Hemisphere has the most. For indigenous peoples, it has been a time to honor their ancient sun deity. They passed their knowledge down to successive generations through complex stories and ritual practices.
As a scholar of the environmental and Native American religion, I believe, there is much to learn from ancient religious practices.
For decades, scholars have studied the astronomical observations that ancient indigenous people made and sought to understand their meaning.
One such place was at Cahokia, near the Mississippi River in what is now Illinois across from St. Louis.
In Cahokia, indigenous people built numerous temple pyramids or mounds, similar to the structures built by the Aztecs in Mexico, over a thousand years ago. Among their constructions, what most stands out is an intriguing structure made up of wooden posts arranged in a circle, known today as “Woodhenge.”
To understand the purpose of Woodhenge, scientists watched the sun rise from this structure on winter solstice. What they found was telling: The sun aligned with both Woodhenge and the top of a temple mound – a temple built on top of a pyramid with a flat top – in the distance. They also found that the sun aligns with a different temple mound on summer solstice.
Archaeological evidence suggests that the people of Cahokia venerated the sun as a deity. Scholars believe that ancient indigenous societies observed the solar system carefully and wove that knowledge into their architecture.
Scientists have speculated that the Cahokia held rituals to honor the sun as a giver of life and for the new agricultural year.
Zuni Pueblo is a contemporary example of indigenous people with an agricultural society in western New Mexico. They grow corn, beans, squash, sunflowers and more. Each year they hold annual harvest festivals and numerous religious ceremonies, including at the winter solstice.
At the time of the winter solstice they hold a multiday celebration, known as the Shalako festival. The days for the celebration are selected by the religious leaders. The Zuni are intensely private, and most events are not for public viewing.
But what is shared with the public is near the end of the ceremony, when six Zuni men dress up and embody the spirit of giant bird deities. These men carry the Zuni prayers for rain “to all the corners of the earth.” The Zuni deities are believed to provide “blessings” and “balance” for the coming seasons and agricultural year.
As religion scholar Tisa Wenger writes, “The Zuni believe their ceremonies are necessary not just for the well-being of the tribe but for “the entire world.”
Not all indigenous peoples ritualized the winter solstice with a ceremony. But that doesn’t mean they didn’t find other ways to celebrate.
The Blackfeet tribe in Montana, where I am a member, historically kept a calendar of astronomical events. They marked the time of the winter solstice and the “return” of the sun or “Naatosi” on its annual journey. They also faced their tipis – or portable conical tents – east toward the rising sun.
They rarely held large religious gatherings in the winter. Instead the Blackfeet viewed the time of the winter solstice as a time for games and community dances. As a child, my grandmother enjoyed attending community dances at the time of the winter solstice. She remembered that each community held their own gatherings, with unique drumming, singing and dance styles.
Later, in my own research, I learned that the Blackfeet moved their dances and ceremonies during the early reservation years from times on their religious calendar to times acceptable to the U.S. government. The dances held at the time of the solstice were moved to Christmas Day or to New Year’s Eve.
Today, my family still spends the darkest days of winter playing card games and attending the local community dances, much like my grandmother did.
Although some winter solstice traditions have changed over time, they are still a reminder of indigenous peoples understanding of the intricate workings of the solar system. Or as the Zuni Pueblo’s rituals for all peoples of the earth demonstrate – of an ancient understanding of the interconnectedness of the world.
(This article is republished from The Conversation under a Creative Commons license. Read the original article.)
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Jean and I wish you all a Very Happy 2024. Please be safe and careful, and be happy!
A woman who knew no bounds when it came to rescuing three large dogs.
This is such a beautiful account of Veronica Shea taking action, and personal risks, to provide, firstly trust, and then love for Princess George, Grace and Steve, as they were named. The story was published on The Dodo.
Please read for yourself.
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Woman Visits Mountain Every Day To Convince Huge Dogs To Let Her Rescue Them
Published on the 26th October, 2023
In 2020, Veronica Shea was out hiking with her dog in the Angeles National Forest in California, when she spotted something strange moving ahead of them.
“We whip around the curve, and I look over and there was this huge black thing,” Shea told The Dodo. “He went up the side of a cliff.”
Shea followed the furry animal and came face to face with three malnourished dogs alone in the wilderness. Realizing the dogs had been abandoned, she knew she had to help them. Every day for several weeks, Shea trudged up the mountain to feed the dogs and work on gaining their trust.
Slowly, the dogs got used to her and even began eating out of her hand. But Shea had no idea how to get them off the mountain. If she trapped one dog, would the others flee? She knew she couldn’t do it alone.
When she asked for help, a whole team of rescuers stepped forward. Together, they carried equipment up the mountain and put together a makeshift cage. The rescuers carefully lured the dogs inside and carried them down the mountain.
The three dogs —mastiffs named Princess George, Grace and Steve, who are believed to be siblings — were safe now. But they still had a long journey ahead.
The rescuers approached Cheri Wulff Lucas, a well known dog behaviorist and trainer in California, to see if she could help the nervous dogs learn to trust again.
“They weren’t adoptable the way they came,” Lucas told The Dodo. “They couldn’t be touched. They couldn’t be leashed. They were just terrified.”
Princess George, Grace and Steve responded well to Lucas’ training. Still, they continued to have a “very strong startle reflex,” said Lucas. This made it difficult to find them the perfect home.
“It was going to take a very special home for them to go into because they’re not the kind of dogs that are going to go to the dog park,” Lucas said. “Even walking them on city streets would be a lot for them. And if they do spook, they weigh 125 pounds, so [they would be] very hard to contain.”
But Lucas knew the dogs were safe on her own property.
“I’m out in the middle of nowhere,” Lucas said. “There’s no traffic around here. You can’t even see another home from here. So if they did get out, they would just come back here to me.”
While Lucas never planned on keeping the dogs herself, that’s exactly what she ended up doing. This turned out to be the best decision for everyone. Princess George, Grace, and Steve continued to live in a safe and supportive environment. And Lucas discovered that the dogs could help her with her work as a trainer.
“If I get dogs that needs socialization — to be more familiar and less reactive with other dogs — I use my pack to help rehabilitate them,” Lucas said. “And all three of them are highly social with dogs. They know how to smell properly, how to not overpower the dog that needs the socialization. They’re just flawless. And that’s not something I taught them — they came that way.”
The threesome were particularly helpful when Lucas started working with another dog named Andi, who was rescued from a hoarding case.
“She had lived in a pen for seven years without human touch or being leashed or anything and she was terrified,” Lucas said. “They just came in and really made her feel comfortable. It was really sweet to see. They brought her around in a way that I never could as a human.”
Lucas ended up adopting Andi as well, bringing her personal pack of dogs to 12.
Princess George, Grace and Steve have been living with Lucas now for over three years, and they’re completely different dogs now.
“They’re incredibly playful,” Lucas said. “If you came to my house and did not know their backstory, you would think they were like any other dog.”
Lucas describes George as a “couch potato” who loves hanging around the house and socializing with the other dogs. Steve is the one who likes to play endless games of “chase” out in the yard. Grace remains a bit timid, but she shares a very close relationship with Steve.
“They’re pets — they’re really pets now,” she said. “They’re not cases for me anymore.”
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Lucas sums it up perfectly in that last sentence; “They’re pets – they’re really pets now,“
Lucas reminds me of Jean for when we first met, in December 2007, Jean had more than twenty dogs at home, all rescues, and led to me publishing my first book in 2009: Learning from Dogs.
Another good article from The Conversation.
I make no apologies for returning to the subject of scams and fakes. Because the advances in the equipment we have for viewing the internet are growing appreciably, and quickly.
We should include scams in this topic. Just a couple of days ago I had a text on my cell-phone that purported to have come from the United States Post Office, the USPS, and at first I was taken in. Luckily I left it for a while and then discovered it was a scam.
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By
Sam Wineburg, Stanford University and Michael Caulfield, University of Washington
Someone tracking the conflict raging in the Middle East could have seen the following two videos on social media. The first shows a little boy hovering over his father’s dead body, whimpering in Arabic, “Don’t leave me.” The second purports to show a pregnant woman with her stomach slashed open and claims to document the testimony of a paramedic who handled victims’ bodies after Hamas’ attack in Israel on Oct. 7, 2023.
Even though these videos come from different sides of the Israel-Hamas war, what they share far exceeds what separates them. Because both videos, though real, have nothing to do with the events they claim to represent. The clip of the boy is from Syria in 2016; the one of the woman is from Mexico in 2018.
Recent headlines warn of sophisticated, AI-driven deepfakes. But it is low-tech cheap fakes like these that fuel the latest round of disinformation. Cheap fakes are the Swiss army knife in the propagandist’s tool belt. Changing a date, altering a location or even repurposing a clip from a video game and passing it off as battlefield combat require little know-how yet effectively sow confusion.
The Israel-Hamas war has unleashed a flood of fake videos on social media.
The good news is that you can avoid being taken in by these ruses – not by examining the evidence closely, which is liable to mislead you, but by waiting until trusted sources verify what you’re looking at. This is often hard to do, however.
Most people are ill-equipped to detect this kind of trickery. Research that we review in our new book, “Verified: How to Think Straight, Get Duped Less, and Make Better Decisions about What to Believe Online,” shows that almost everyone falls for it.
In the largest survey of its kind, 3,446 high school students evaluated a video on social media that purported to show election fraud in the 2016 Democratic primary. Students could view the whole video, part of it or leave the footage to search the internet for information about it. Typing a few keywords into their browsers would have led students to articles from Snopes and the BBC debunking the video. Only three students – less than one-tenth of 1% – located the true source of the video, which had, in fact, been shot in Russia.
Why were students so consistently duped? The problem, we’ve found, is that many people, young and old alike, think they can look at something online and tell what it is. You don’t realize how easily your eyes can be deceived – especially by footage that triggers your emotions.
When an incendiary video dodges your prefrontal cortex and lands in your solar plexus, the first impulse is to share your outrage with others. What’s a better course of action? You might assume that it is to ask whether the clip is true or false. But a different question – rather, a set of related questions – is a better starting place.
These questions require no advanced knowledge of video forensics. They require you only to be honest with yourself. Your inability to answer these questions should be enough to make you realize that, no, you don’t really know what you’re looking at.
Social media reports of “late-breaking news” are not likely to be reporting at all, but they are often pushed by rage merchants wrapping an interpretation around a YouTube video accompanied by lightning bolt emojis and strings of exclamation points. Reliable reporters need time to establish what happened. Rage merchants don’t. The con artist and the propagandist feed on the impatient. Your greatest information literacy superpower is learning to wait.
If there are legs to the video, rest assured you’re not the only one viewing it. There are many people, some of whom have mastered advanced techniques of video analysis, who are likely already analyzing it and trying to get to the bottom of it.
You won’t have to wait long to learn what they’ve found.
Sam Wineburg, Professor of Education and (by courtesy) History, Stanford University and Michael Caulfield, Research Scientist, Center for an Informed Public, University of Washington
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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I hope you found this of interest. We live in many ways in a really strange world; I am talking about the digital world, of course.
A YouTube video presented to you all.
I came across this collection of videos, all short, that have been combined into a single YouTube video.
Here is the text that came with that video.
Many know that dogs are wonderful pets that quickly turn into family. These inspiring dog stories highlight the impact a dog rescue, recovery, or reunion can make in the lives of everyday Americans. From a veteran’s emotional reunion with his beloved dog to a dog surviving a bullet wound, here are great stories of dogs and the people who love them.
Very Local
Just ten minutes long it is nevertheless a fabulous account of our closest animal friend.
“The Future of Democracy” is, for me, incredibly interesting.
I haven’t a clue as to how long I have been listening to the annual Reith Lecture on BBC Radio 4. It has been many years.
As Wikipedia explains:
The Reith Lectures is a series of annual BBC radio lectures given by leading figures of the day. They are commissioned by the BBC and broadcast on Radio 4 and the World Service. The lectures were inaugurated in 1948 to mark the historic contribution made to public service broadcasting by Lord Reith, the corporation’s first director-general.
Reith maintained that broadcasting should be a public service that aimed to enrich the intellectual and cultural life of the nation. It is in this spirit that the BBC each year invites a leading figure to deliver the lectures. The aim is to advance public understanding and debate about issues of contemporary interest.
Wikipedia
As the BBC explains on the BBC Sounds website:
Released On: 29 Nov 2023
Available for over a year
This year’s BBC Reith Lecturer is Ben Ansell, Professor of Comparative Democratic Institutions at Nuffield College, Oxford University.
He will deliver four lectures called “Our Democratic Future,” asking how we can build a politics that works for all of us with systems which are robust to the challenges of the twenty first century, from climate change to artificial intelligence. In this first lecture, recorded at New Broadcasting House in London in front of an audience, Professor Ansell asks whether we are in a ‘democratic recession’, where longstanding democracies are at risk of breakdown and authoritarianism is resurgent. And he examines how resilient democracies are to the challenges of artificial intelligence, social media and if they can effectively address core challenges from climate change to inequality.
The Reith Lectures are presented by Anita Anand and produced by Jim Frank. The Editor is China Collins. Reith Co-ordinator is Brenda Brown. The series is mixed by Rod Farquhar and Neil Churchill.
Here is the link to that first lecture: https://www.bbc.co.uk/sounds/play/m001sty4
Ben Ansell’s website is here, from which I have taken this:
Welcome to my website. I am Professor of Comparative Democratic Institutions at Nuffield College, University of Oxford. My work focuses on a variety of issues in political economy, including both comparative politics and international relations.
I am also co-editor (with David Samuels) of Comparative Political Studies.
My 2010 book, From the Ballot to the Blackboard, published by Cambridge University Press, is available here. My 2014 book (with David Samuels), Inequality and Democratization: An Elite-Competition Approach, published by Cambridge University Press, is available here.
This site contains a variety of working papers, syllabi, my biography, and other information about my academic work. My CV is available here.
Some fantastic photographs of owls!
This is a change of subject for today’s Picture Parade.
I have been for some time complimenting my son on his brilliant photographs. I have been admiring them on Instagram but, of course, one cannot copy them from there. So Alex sent me the following by email.
Plus, Alex has rightly copyrighted these photographs and also states that his Instagram profile is @Alex_handover_photography. There are more of Alex’s photographs to admire over on Instagram.
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These are fabulous and just endorses the care and attention that Alex puts into his photography.
Hannah Ritchie raises a very important question.
I was born in London before the end of World War II and to a great extent my upbringing was in the times of yesterday. But the world has moved on in many, many ways. It is too easy to say that we live in very strange times.
Thus it was enlightening to come across this talk, under the TED Talks banner, quite recently. I have great pleasure in sharing it with you. Plus, Hannah’s website is here. (From which I have taken the following words!)
(P.S. The YouTube video is just over thirteen minutes long. It automatically runs into the next video so you will have to stop it yourself.)
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The word “sustainability” gets thrown around a lot these days. But what does it actually mean for humanity to be sustainable? Environmental data scientist Hannah Ritchie digs into the numbers behind human progress across centuries, unpacking why the conventional understanding of sustainability is misleading and showing how we can be the first generation of humans to actually achieve it.
Hannah Ritchie is deputy editor and research lead at Our World in Data, an online publication making data and research on the world’s largest problems accessible and understandable for non-experts. She is a senior researcher at the University of Oxford, where she studies how environmental issues intersect with others like poverty, global health and education. She has also done extensive research into the question of how to feed everyone in the world a nutritious diet without wrecking the planet. Her work has appeared in The New York Times, The Washington Post, Vox, Wired, BBC, Al Jazeera, The Economist and New Scientist.
In 2022, Ritchie was named Scotland’s Youth Climate Champion. She is also an honorary fellow at the University of Edinburgh and Edinburgh Centre for Carbon Innovation, and a fellow at the Energy for Growth Hub, focused on ending global energy poverty. Her forthcoming book, The First Generation, makes an evidence-based case for why we have a meaningful chance to solve global environmental problems for the first time in human history.
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It is a very inspiring talk; please watch it!
Well it was new to me!
But first of all I should pass on a Very Happy Thanksgiving to you all. I apologise for forgetting to write this yesterday when I was preparing this post.
I came across the Dog Training Academy site the other day and found it full of tips. I trust that with the link in place in this post I can republish articles that are found on it.
For example, on July 14th, 2023 Laura Brown published a post on the philosophy of dog training. Here is the article.
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Developing a Effective Dog Training Philosophy: Techniques and Strategies
Dog training philosophy refers to the underlying principles and beliefs that guide how dog owners train and interact with their furry companions. Different dog owners have different philosophies when it comes to training their dogs, and each approach can have a significant impact on the dog’s behavior and well-being.
In this article, we’ll explore the different dog training philosophies and the benefits and drawbacks of each approach.
Positive reinforcement is a popular dog training philosophy that involves rewarding desired behaviors with treats, praise, or other positive stimuli. The idea is to encourage dogs to repeat behaviors that lead to positive outcomes while discouraging behaviors that lead to negative outcomes.
Positive reinforcement is a humane and effective way to train dogs. It builds trust and strengthens the bond between the owner and the dog. It’s also an enjoyable and rewarding experience for both the dog and the owner.
One potential drawback of positive reinforcement is that it can be time-consuming. Owners must be patient and consistent in rewarding desired behaviors, and it may take longer for some dogs to learn new behaviors than others.
Punishment-based training is a dog training philosophy that involves punishing undesirable behaviors with negative stimuli, such as physical correction or verbal scolding. The idea is to discourage dogs from repeating behaviors that lead to negative outcomes while encouraging behaviors that lead to positive outcomes.
Punishment-based training can be effective in stopping unwanted behaviors quickly. However, it can also have negative consequences for the dog’s emotional well-being. Dogs that are punished frequently may become fearful or aggressive, and their trust in their owners may be damaged.
Moreover, punishment-based training can result in a negative relationship between the owner and the dog. Dogs may learn to fear their owners, which can lead to a breakdown in communication and a lack of trust.
Dominance-based training is a dog training philosophy that is based on the belief that dogs are pack animals that instinctively seek to establish a social hierarchy. The idea is to assert dominance over the dog and establish the owner as the pack leader.
Dominance-based training can be effective in certain situations, such as when dealing with aggressive dogs. However, it can also be harmful to the dog’s emotional well-being. Dogs that are subjected to dominance-based training may become fearful, anxious, or aggressive, and their trust in their owners may be damaged.
Moreover, the concept of dominance in dog behavior has been debunked by many dog behaviorists and trainers. While dogs do live in social groups and establish hierarchies, the idea that dogs constantly seek to establish dominance over their owners is not supported by scientific evidence.
Relationship-based training is a dog training philosophy that is based on the belief that dogs are social animals that thrive on positive interactions with their owners. The idea is to build a strong, positive relationship between the owner and the dog, which will lead to a well-behaved and happy dog.
Relationship-based training is a humane and effective way to train dogs. It emphasizes positive reinforcement and building a strong bond between the owner and the dog. It also encourages owners to understand their dog’s behavior and to communicate effectively with their furry companion.
One potential drawback of relationship-based training is that it can be time-consuming. It requires a significant amount of effort and dedication on the part of the owner to build a strong relationship with their dog. Moreover, some dogs may require more time and effort to establish a strong bond with their owner.
Balanced training is a dog training philosophy that combines elements of positive reinforcement, punishment-based training, and dominance-based training. The idea is to use a variety of training methods to achieve the desired behavior in the dog.
Balanced training can be effective in certain situations, such as when dealing with complex behavior issues. However, it can also be confusing and overwhelming for dogs. They may not understand what behavior is being rewarded or punished, and their trust in their owner may be compromised.
Moreover, balanced training can lead to a lack of consistency in the training approach, which can confuse the dog and make it difficult for them to learn new behaviors.
In conclusion, there are different dog training philosophies, and each approach can have a significant impact on the dog’s behavior and well-being. Positive reinforcement and relationship-based training are generally considered to be the most humane and effective ways to train dogs. Punishment-based and dominance-based training can have negative consequences for the dog’s emotional well-being and may damage the relationship between the owner and the dog.
Balanced training can be effective in certain situations, but it requires a significant amount of skill and knowledge to implement properly. Moreover, it can be confusing and overwhelming for dogs, and their trust in their owner may be compromised.
As a dog owner, it’s essential to understand the different dog training philosophies and choose the approach that best suits your dog’s needs and personality. It’s also essential to seek the advice of a professional dog trainer or behaviorist if you’re experiencing issues with your dog’s behavior. A trained professional can help you identify the underlying causes of your dog’s behavior and develop a training plan that will address those issues effectively.
In the end, the goal of dog training should be to build a strong, positive relationship between the owner and the dog. When dogs are well-trained, happy, and healthy, they make wonderful companions and enrich our lives in countless ways. By choosing the right dog training philosophy and approach, you can help your furry friend become the best possible version of themselves.
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As I said at the beginning, I hope republishing this text is alright. Because I think it is a very good article from a very useful website.
I am reproducing a recent article published by The Conversation.
It is a reflection of the latest research undertaken by NASA, it is beyond fascinating!
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Ryan Keeley, 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.
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.
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.
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.
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.
Ryan Keeley, Postdoctoral Scholar in Physics, University of California, Merced
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Ryan Keeley explains it above. Hopefully most of you who read this understand the physics involved. Ryan has a website here.
As I said at the start it is beyond fascinating! In the truest sense, out of this world!
Learning from Dogs 
