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According to Physicists and Philosophers, Time Might Not Exist – And That's OK – Revista Galileu – brytfmonline.com

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If time isn’t a fundamental property of the universe, it can still “emerge” from something more fundamental (Photo: Shutterstock)

Is there time? The answer to this question may seem obvious: of course it is! Just look at the calendar or the clock. But developments in physics suggest that the lack of time is an open possibility and we should take it seriously.

like him? And what does that mean? It will take some time to explain this, but do not worry: even if there is no time, our lives will continue as usual.

crisis in physics
Physics is in crisis. In the last century, we explained the universe with two very successful physical theories: general relativity and quantum mechanics.

Quantum mechanics describes how things work in the tiny realm of particles and particle interactions. General relativity describes the big picture of gravity and how objects move.

Both theories work very well on their own, but the two are believed to contradict each other. While the exact nature of the conflict is controversial, scholars generally agree that both theories should be replaced by a new, more general theory.

Physicists want to produce a theory of “quantum gravity” that replaces general relativity and quantum mechanics, while achieving the extraordinary success of both. Such a theory explains how the big picture of gravity works on a particle miniature scale.

Time in quantum gravity
It turns out that producing a theory of quantum gravity is very difficult. One attempt to overcome the conflict between the two theories is string theory. String theory replaces particles with strings that vibrate up to 11 dimensions.

However, string theory faces an additional difficulty. String theory provides a variety of models that describe a universe much like our own, and it doesn’t make clear predictions that can be tested with experiments to see which model is correct.

In the 1980s and 1990s, many physicists became dissatisfied with string theory and came up with a series of new mathematical methods for quantum gravity.

One of the most notable is toroidal quantum gravity, which suggests that the fabric of space and time consists of a network of very small discrete pieces, or “rings”.

One of the cool aspects of loop quantum gravity is that it seems to completely kill time.

Ring quantum gravity is not alone in eliminating time: many other approaches seem to remove time as a fundamental aspect of reality.

Appear time
So we know that we need a new physical theory to explain the universe, and that theory may not include time. Suppose such a theory is correct. Does this mean that time does not exist? It’s complex, and it depends on what we mean by being.

Physics theories do not include tables, chairs, or people, yet we accept that there are tables, chairs, and people. Because? Because we assume that such things exist at a higher level than described in physics.

For example, streams are said to “sprout” from the fundamental physics of particles orbiting the universe.

But while we have a pretty good idea of ​​how to make a table out of fundamental particles, we have no idea how to “make” time out of something more fundamental.

So unless we can come up with a good explanation of how time appears, it is not clear that we can simply assume that time exists. There may not be time at any level.

time and agency
Saying that time does not exist at any level is like saying that there are no tables. Trying to survive in a world without tables can be difficult, but managing a world without time seems disastrous.

Our whole life is built on time. We plan for the future in light of what we know about the past. We hold people morally responsible for their past actions, with a view to reprimanding them later.

We believe that we are agents (entities that can do things) in part because we can plan to act in a way that will bring about change in the future. But what is the point of working to bring about change in the future when, in a very real sense, there is no future to work for?

What is the point of punishing someone for a past action when there is no past and therefore no action apparently? Finding out that there is no time can stop the whole world. We would have no reason to get out of bed.

work as usual

There is a way out of the confusion. While physics can eliminate time, it seems to leave “causation” as it is: the idea that one thing can cause another.

Perhaps physics tells us, then, that causation, not time, is the essential feature of our universe.

If true, the agency can still survive. Because it is possible to completely reconstruct the feeling of agency from a causal perspective.

At least, that’s what Kristi Miller, Jonathan Talant, and I discuss in our new book. [Out of Time: A Philosophical Study of Timelessnes, sem edição em português]. We suggest that the discovery that time does not exist may not have a direct impact on our lives, even as it pushes physics into a new era.

* Sam Barron is an associate professor at the Australian Catholic University. This article was originally Published in English on The Conversation.

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Canada to donate up to 200,000 vaccine doses to combat mpox outbreaks in Africa

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The Canadian government says it will donate up to 200,000 vaccine doses to fight the mpox outbreak in Congo and other African countries.

It says the donated doses of Imvamune will come from Canada’s existing supply and will not affect the country’s preparedness for mpox cases in this country.

Minister of Health Mark Holland says the donation “will help to protect those in the most affected regions of Africa and will help prevent further spread of the virus.”

Dr. Madhukar Pai, Canada research chair in epidemiology and global health, says although the donation is welcome, it is a very small portion of the estimated 10 million vaccine doses needed to control the outbreak.

Vaccine donations from wealthier countries have only recently started arriving in Africa, almost a month after the World Health Organization declared the mpox outbreak a public health emergency of international concern.

A few days after the declaration in August, Global Affairs Canada announced a contribution of $1 million for mpox surveillance, diagnostic tools, research and community awareness in Africa.

On Thursday, the Africa Centres for Disease Control and Prevention said mpox is still on the rise and that testing rates are “insufficient” across the continent.

Jason Kindrachuk, Canada research chair in emerging viruses at the University of Manitoba, said donating vaccines, in addition to supporting surveillance and diagnostic tests, is “massively important.”

But Kindrachuk, who has worked on the ground in Congo during the epidemic, also said that the international response to the mpox outbreak is “better late than never (but) better never late.”

“It would have been fantastic for us globally to not be in this position by having provided doses a much, much longer time prior than when we are,” he said, noting that the outbreak of clade I mpox in Congo started in early 2023.

Clade II mpox, endemic in regions of West Africa, came to the world’s attention even earlier — in 2022 — as that strain of virus spread to other countries, including Canada.

Two doses are recommended for mpox vaccination, so the donation may only benefit 100,000 people, Pai said.

Pai questioned whether Canada is contributing enough, as the federal government hasn’t said what percentage of its mpox vaccine stockpile it is donating.

“Small donations are simply not going to help end this crisis. We need to show greater solidarity and support,” he said in an email.

“That is the biggest lesson from the COVID-19 pandemic — our collective safety is tied with that of other nations.”

This report by The Canadian Press was first published Sept. 13, 2024.

Canadian Press health coverage receives support through a partnership with the Canadian Medical Association. CP is solely responsible for this content.

The Canadian Press. All rights reserved.

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How many Nova Scotians are on the doctor wait-list? Number hit 160,000 in June

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HALIFAX – The Nova Scotia government says it could be months before it reveals how many people are on the wait-list for a family doctor.

The head of the province’s health authority told reporters Wednesday that the government won’t release updated data until the 160,000 people who were on the wait-list in June are contacted to verify whether they still need primary care.

Karen Oldfield said Nova Scotia Health is working on validating the primary care wait-list data before posting new numbers, and that work may take a matter of months. The most recent public wait-list figures are from June 1, when 160,234 people, or about 16 per cent of the population, were on it.

“It’s going to take time to make 160,000 calls,” Oldfield said. “We are not talking weeks, we are talking months.”

The interim CEO and president of Nova Scotia Health said people on the list are being asked where they live, whether they still need a family doctor, and to give an update on their health.

A spokesperson with the province’s Health Department says the government and its health authority are “working hard” to turn the wait-list registry into a useful tool, adding that the data will be shared once it is validated.

Nova Scotia’s NDP are calling on Premier Tim Houston to immediately release statistics on how many people are looking for a family doctor. On Tuesday, the NDP introduced a bill that would require the health minister to make the number public every month.

“It is unacceptable for the list to be more than three months out of date,” NDP Leader Claudia Chender said Tuesday.

Chender said releasing this data regularly is vital so Nova Scotians can track the government’s progress on its main 2021 campaign promise: fixing health care.

The number of people in need of a family doctor has more than doubled between the 2021 summer election campaign and June 2024. Since September 2021 about 300 doctors have been added to the provincial health system, the Health Department said.

“We’ll know if Tim Houston is keeping his 2021 election promise to fix health care when Nova Scotians are attached to primary care,” Chender said.

This report by The Canadian Press was first published Sept. 11, 2024.

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Newfoundland and Labrador monitoring rise in whooping cough cases: medical officer

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ST. JOHN’S, N.L. – Newfoundland and Labrador‘s chief medical officer is monitoring the rise of whooping cough infections across the province as cases of the highly contagious disease continue to grow across Canada.

Dr. Janice Fitzgerald says that so far this year, the province has recorded 230 confirmed cases of the vaccine-preventable respiratory tract infection, also known as pertussis.

Late last month, Quebec reported more than 11,000 cases during the same time period, while Ontario counted 470 cases, well above the five-year average of 98. In Quebec, the majority of patients are between the ages of 10 and 14.

Meanwhile, New Brunswick has declared a whooping cough outbreak across the province. A total of 141 cases were reported by last month, exceeding the five-year average of 34.

The disease can lead to severe complications among vulnerable populations including infants, who are at the highest risk of suffering from complications like pneumonia and seizures. Symptoms may start with a runny nose, mild fever and cough, then progress to severe coughing accompanied by a distinctive “whooping” sound during inhalation.

“The public, especially pregnant people and those in close contact with infants, are encouraged to be aware of symptoms related to pertussis and to ensure vaccinations are up to date,” Newfoundland and Labrador’s Health Department said in a statement.

Whooping cough can be treated with antibiotics, but vaccination is the most effective way to control the spread of the disease. As a result, the province has expanded immunization efforts this school year. While booster doses are already offered in Grade 9, the vaccine is now being offered to Grade 8 students as well.

Public health officials say whooping cough is a cyclical disease that increases every two to five or six years.

Meanwhile, New Brunswick’s acting chief medical officer of health expects the current case count to get worse before tapering off.

A rise in whooping cough cases has also been reported in the United States and elsewhere. The Pan American Health Organization issued an alert in July encouraging countries to ramp up their surveillance and vaccination coverage.

This report by The Canadian Press was first published Sept. 10, 2024.

The Canadian Press. All rights reserved.

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