Objects, including spacecraft, could pierce through the universe using several black holes as a ‘shortcut’, a new study suggests.
The new theory posited by French physicist Pascal Koiran marks a break from earlier research in the field of black hole studies. Previously, it was thought that a so-called ‘wormhole’ composed of two black holes would be prone to instantly collapse, thus making it impossible for an object to successfully travel all the way from one side and out the other. However, by employing different metrics, the French scientist’s new model has arrived at a very different conclusion: “We show that the particle reaches the wormhole throat for a finite value t′1 of the time marker t′.” In essence, that means an object, for instance, a spacecraft, could pass through this wormhole portal intact and reach some far-away region of the universe, taking far less time than would be needed if traveling conventionally.
The study in its entirety will see the light of day in the upcoming issue of the Journal of Modern Physics D, though an abstract has been available since early October.
Yet, there are too many ifs as to whether this purely theoretical model has any bearing on the way the universe actually works. For starters, to create such a time-and-space tunnel you would need a regular black hole and a so-called white hole, which is essentially a black hole in reverse. While black holes never let anything out, their ‘twins’ never let anything in. So, according to Albert Einstein’s theory of general relativity and Nathan Rosen’s additions to it, if you were to connect the two, they would make up a bridge across time and space. However, if the laws postulated by another branch of physics, thermodynamics, are anything to go by, such a construct would be highly unstable. Perhaps more importantly, the very existence of white holes has yet to be proven beyond a reasonable doubt. At present, they remain a pure theorization, thus putting any talk of space-and-time portals on rather shaky ground.
Greece will soon prohibit unvaccinated residents from entering a litany of public spaces, the country’s prime minister has announced, claiming its current Covid outbreak is largely fueled by those who haven’t received the jab.
Starting next week, the unvaccinated will be barred from entry to restaurants, cafes, theaters, bars, gyms and museums, among other indoor public places, PM Kyriakos Mitsotakis said on Thursday, noting that a negative Covid-19 test will no longer be accepted as an alternative to proof of vaccination.
“This is indeed a pandemic of the unvaccinated,” he said as he announced the move in a televised address, adding “Greece is mourning unnecessary losses because it simply does not have the vaccination rates of other European countries.”
The new rules are set to take effect on Monday, and will require Greeks to present vaccine certificates to businesses and other indoor establishments to be allowed inside. Those attending religious services mark a rare exception, however, as they will only be asked to present a negative test in order to enter a church or other place of worship.
In a bid to encourage booster vaccinations among the elderly – a population much more vulnerable to Covid-19 – citizens over the age of 60 will be made to renew their certificate after a period of seven months.
While officials had hoped to hit a full vaccination figure of 70% for Greece’s population of 11 million by autumn, the number currently stands at about 62%, according to Reuters. As its weekly case counts continue to soar to record highs, the country reported 7,317 new Covid-19 infections and 63 deaths on Thursday, bringing the totals to more than 860,000 cases and some 17,000 fatalities since the pandemic kicked off in late 2019.
The new restrictions in Greece mirror similar policies implemented elsewhere in Europe, with Austria, Germany, Italy, France, the Czech Republic and Slovakia each imposing limits on public life for the unvaccinated. Though the Austrian government recently imposed a full lockdown for millions of residents who have not received the shot, some officials in that country are pushing for even harsher policies, including a national stay-at-home order on the jabbed and non-jabbed alike.
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The Islamic State terrorist group is tearing a path across Afghanistan, establishing itself in “nearly all” of its provinces while increasing attacks more than five-fold in the past year, the UN’s envoy to the country has warned.
Addressing the UN Security Council on Wednesday, the body’s special representative for Afghanistan Deborah Lyons spoke of a major Islamic State (IS, formerly ISIS) surge through the war-torn country, claiming the jihadist group has now expanded nationwide.
“Once limited to a few provinces and the capital, ISKP now seems to be present in nearly all provinces, and increasingly active,” Lyons said, referring to the group’s Afghanistan-based ‘Khorasan’ faction. She added that so far in 2021, IS has carried out 334 attacks, up from just 60 last year.
The envoy’s comments came just hours after an Islamic State bombing erupted in a Shiite Muslim neighborhood of the Afghan capital, killing one and wounding six others, according to Reuters.
Since taking over as the government following a chaotic US withdrawal and the outright collapse of the American-backed administration in Kabul last summer, the Taliban has struggled to keep the terrorist group at bay, Lyons said. Though she noted that the Taliban insists it is “waging a concerted campaign” against IS and is making “genuine efforts to present itself as a government,” she said its response “appears to rely heavily on extrajudicial detentions and killings.”
Despite the rise in IS attacks in recent months, however, Lyons said the overall security situation in Afghanistan has improved since the end of the US war, which stretched on for two decades.
In addition to the terrorism issue, the UN representative also cited broader concerns for the country in the coming months, warning of a looming “humanitarian catastrophe” driven by a litany of causes, including foreign sanctions – which she said have “paralyzed” the local banking system – as well as growing levels of food shortages due to famine and a failing economy, among other factors.
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