Technologies

If The Universe Is A Hologram, We May Soon Gaze Into A Black Hole

A mind-bending theory called holographic duality could lead us into the universe’s deepest, darkest voids.

If you fell into a black hole, your journey might look something like this.

First, you’d stare into the rich, red event horizon of the abyss. Beyond this barrier, light cannot escape. As you get closer, your body would stretch out like chewing gum until it spaghettifies into the void. If you’re still conscious at this point, you’d peer out the entrance and watch a warped universe grow smaller by the second. That wouldn’t be your universe anymore. The black hole would be.

In all probability, though, you’d quickly be ripped to shreds.

Because of this absolutely horrifying disaster, we’ll likely never receive firsthand evidence of what lies within these cosmic mysteries. But in a paper published this month in the journal PRX Quantum, scientists are working toward the next best thing. They developed computing algorithms to help solve a mind-bending theory in physics called «holographic duality.»

In a nutshell, holographic duality suggests that the three-dimensional universe, like space inside black holes, is mathematically strung to the two-dimensional universe, like particle planes and magnetic fields. It basically presents the fabric of spacetime as a 3D hologram «projected» by 2D webs.

I know what you’re thinking. No, this wouldn’t be like the Star Trek holodeck. Unlike classic sci-fi holograms projected by light from a screen, holographic duality is bound by pure mathematics.

«It has not been proven formally, under the point of view of rigorous mathematics, but we know many examples where this duality actually works,» says lead author Enrico Rinaldi, a research scientist at the University of Michigan, based in Tokyo and hosted by the Riken Center for Quantum Computing and the Theoretical Quantum Physics Laboratory.

If holographic duality truly dictates the universe, scientists wouldn’t have to go inside a black hole to take a picture of it. Instead, they could study easy-to-handle 2D space around the beast, then extrapolate the 3D architecture lurking inside. «It is often the case that things difficult to compute on one side are easy to compute on the other side,» Rinaldi says. «That is why this duality is very important and useful.»

He compares the idea to having a dictionary where you can look up a word on one page and find its meaning on another. We just need some sort of index to bridge the 2D space-words with their 3D space-definitions — aka, the mathematical connection. And that’s precisely what Rinaldi’s algorithms are poised to do.

However, before we can use them to unlock the inside of a black hole, there are several, pretty trippy, steps to take. «The duality, as it is right now, applies to a specific spacetime, which is different from the spacetime of our universe,» Rinaldi says.

In other words, holographic duality is confined to a sort of alternate, theoretical world that scientists use as a sandbox.

A spacetime playground

1916 was a big year for physics. Albert Einstein had published the first of many papers that would forever alter the field: a holy grail chronicle of general relativity. Since then, the theory has earned a reputation for being unbreakable. I could go on forever about its spectacular consequences, but here’s the important part for holographic duality.

Suppose you have a trampoline and drop a soccer ball into it. The flat surface will morph inward, depending on where the ball settles. Now, add a tiny marble to the scene. It’ll fall along the trampoline’s curve and nestle next to the soccer ball.

In this analogy, the marble is you, the soccer ball is Earth and the trampoline is the intangible fabric of space and time — spacetime. According to general relativity, gravity is this «curve» we fall along until we’re planted on the ground.

In our universe — which, per experts, is known as the «de Sitter» universe — spacetime’s curvature is positive. That’s a problem. A positive model isn’t great for math equations, Rinaldi explains, especially when it comes to ultra high-dimensional ones. But there’s an easy fix. Scientists simply calculate stuff in a theoretical universe with negative curvature: the anti de Sitter universe. Then they translate their results back to our realm.

Fast-forward to the late 1960s. String theory is born.

Allowing for simplification, string theory says if you break down atoms, the building blocks of our universe, into elementary particles, then pulverize those into even smaller specks, and so on, you’ll eventually get to infinitesimal vibrating «strings.»

Presumably, these strings make up all we know: particles, fields, spacetime. If string theory is true, even you and I are made up of the wiggling bits. That’s why this concept is such a big deal. It might well be the closest we’ve gotten to a theory of everything. On the flip side, however, some physicists consider string theory a dead end because we still haven’t found concrete evidence for its premises.

But regardless, string theory requires unfathomable 11-dimension equations — as you might’ve guessed, that means it’s rooted in the anti de Sitter universe. And per Rinaldi, holographic duality relies on string theory. Thus, it’s also rooted in the anti de Sitter universe.

«Black holes we can investigate right now, with this duality, are not the same black holes that we imagine being out there,» Rinaldi says. «These black holes are a sort of mathematical playground that we can use to formulate this duality and test it.»

Simply put: In this mathematically ideal universe, Rinaldi is observing theoretical black holes to understand holographic duality. It’s like playing a game in tutorial mode before the real level starts. Our universe.

Getting to that level, though, is the crux of this whole procedure. «If we can do it for anti de Sitter,» Rinaldi says, «then we should be doing it for de Sitter.»

«The final goal is still to be able to describe gravity and black holes in our universe.»

The road into a black hole

OK, here’s where it all comes together.

First, a quick recap: Holographic duality can show us what’s inside a black hole because it suggests the 2D universe is connected to the 3D universe via mathematics. We just have to construct an index to bridge the two dimensions. But holographic duality is based on string theory. So, first, we have to make the index’s blueprints in our sandbox universe — the theoretical, anti de Sitter universe.

How do we make the blueprints? Well, Rinaldi says, start with the easier side. That’s the 2D half. But even though this side hurts less to think about, it isn’t that simple; we still need strong numerical methods to analyze it. «That’s what we’re doing,» Rinaldi says. «The numerical part.»

Think of the universe as a blanket knitted by strings that have a bunch of points. Rinaldi’s algorithms use quantum computing and deep learning to help calculate where these points are on the blanket and how they’re attached to each other. The goal is to sort of draw out the «strings» of string theory, then put them all together, like cosmic connect-the-dots.

However, the researchers are still in the proof-of-principle stage. They solved a few prototype points with their method, but these points don’t really represent anything. In the future, though, Rinaldi says the method can scale up to study complex points really present on anti de Sitter strings, including those relevant to anti de Sitter black holes.

Then, we’ll be on our way to making the anti de Sitter 2D-to-3D index that’ll reveal the insides of these theoretical black holes.

Then, if the index is precise enough, it can be translated to our true-to-the-bone, observable universe.

Then… we can use the final index to learn about the threatening insides of real, de Sitter black holes from the comfort of our homes and tucked away from terror.

A new theory of everything?

When you think about the steps Rinaldi and tons of other researchers are taking to realize the insides of a black hole — study prototype theoretical universe strings, scale up to learn about the full theoretical universe’s geometry, zero in on theoretical black holes, take all of that and filter the real universe through it, and probably more we can’t even comprehend — a jarring question might be… why?

Why does this all matter?

«We think we are very close to explaining the information paradox of black holes,» Rinaldi says. «If information goes inside a black hole, general relativity says, OK, whatever goes in is gone forever.»

But quantum mechanics, the other founding principle of our universe, says you cannot lose information. It says information is always maintained. Perhaps it can change, transform or adapt, but it cannot go away. So what’s happening to the information plunging into these massive space-borne voids?

«Stephen Hawking came up with this idea of the evaporation of a black hole and said ‘Look, actually there is stuff coming out of a black hole, it’s just slowly coming out’,» Rinaldi says.

But even those bits coming out don’t look like what went in. Stuff still seems lost in the process. «This is a very, very big problem in physics,» Rinaldi says. «And people are using the duality to understand that paradox.» If we can understand what’s inside, then maybe we can prove so-called lost information is actually, well, inside.

«Maybe it’s not lost, it’s just in a different configuration. It’s not particles anymore; it’s not spacetime anymore; it’s something else.»

Technologies

An AWS Outage Broke the Internet While You Were Sleeping

Reddit, Roblox and Ring are just a tiny fraction of the 1,000-plus sites and services that were affected when Amazon Web Services went down, causing a major internet blackout.

The internet kicked off the week the way that many of us often feel like doing: by refusing to go to work. An outage at Amazon Web Services rendered huge portions of the internet unavailable on Monday morning, with sites and services including Snapchat, Fortnite, Venmo, the PlayStation Network and, predictably, Amazon, unavailable for a short period of time.

The outage began shortly after midnight PT, and took Amazon around 3.5 hours to fully resolve. Social networks and streaming services were among the 1,000-plus companies affected, and critical services such as online banking were also taken down. You’ll likely find most sites and services functioning as usual this morning, but some knock-on effects will probably be seen throughout the day.

AWS, a cloud services provider owned by Amazon, props up huge portions of the internet. So when it went down, it took many of the services we know and love with it. As with the Fastly and Crowdstrike outages over the past few years, the AWS outage shows just how much of the internet relies on the same infrastructure — and how quickly our access to the sites and services we rely on can be revoked when something goes wrong. The reliance on a small number of big companies to underpin the web is akin to putting all of our eggs in a tiny handful of baskets.

When it works, it’s great, but only one small thing needs to go wrong for the internet to come to its knees in a matter of minutes.

How widespread was the AWS outage?

Just after midnight PT on October 20, AWS first registered an issue on its service status page, saying it was «investigating increased error rates and latencies for multiple AWS services in the US-EAST-1 Region.» Around 2 a.m. PT, it said it had identified a potential root cause of the issue, and within half an hour, it had started applying mitigations that were resulting in significant signs of recovery.

«The underlying DNS issue has been fully mitigated, and most AWS Service operations are succeeding normally now,» AWS said at 3.35 a.m. PT. The company didn’t respond to request for further comment beyond pointing us back to the AWS health dashboard.

Around the time that AWS says it first began noticing error rates, Downdetector saw reports begin to spike across many online services, including banks, airlines and phone carriers. As AWS resolved the issue, some of these reports saw a drop off, whereas others have yet to return to normal. (Disclosure: Downdetector is owned by the same parent company as CNET, Ziff Davis.)

Around 4 a.m. PT, Reddit was still down, while services including Ring, Verizon and YouTube were still seeing a significant number of reported issues. Reddit finally came back online around 4.30 a.m. PT, according to its status page, which was then verified by us.

In total, Downdetector saw over 6.5 million reports, with 1.4 million coming from the US, 800,000 from the UK and the rest largely spread across Australia, Japan, the Netherlands, Germany and France. Over 1,000 companies in total have been affected, Downdetector added.

«This kind of outage, where a foundational internet service brings down a large swathe of online services, only happens a handful of times in a year,» Daniel Ramirez, Downdetector by Ookla’s director of product told CNET. «They probably are becoming slightly more frequent as companies are encouraged to completely rely on cloud services and their data architectures are designed to make the most out of a particular cloud platform.»

What caused the AWS Outage?

AWS hasn’t shared full details about what caused the internet to fall off a cliff this morning. The likelihood is that now it’s deployed a fix, its next step will be to investigate what went wrong.

So far it’s attributed the outage to a «DNS issue.» DNS stands for the Domain Name System and refers to the service that translates human-readable internet addresses (for example, CNET.com) into machine-readable IP addresses that connects browsers with websites.

When a DNS error occurs, the translation process cannot take place, interrupting the connection. DNS errors are common are common internet roadblocks, but usually happen on small scale, affecting individual sites or services. But because the use of AWS is so widespread, a DNS error can have equally widespread results.

According to Amazon, the issue is geographically rooted in its US-EAST-1 region, which refers to an area of North Virginia where many of its data centers are based. It’s a significant location for Amazon, as well as many other internet companies, and it props up services spanning the US and Europe.

«The lesson here is resilience,» said Luke Kehoe, industry analyst at Ookla. «Many organizations still concentrate critical workloads in a single cloud region. Distributing critical apps and data across multiple regions and availability zones can materially reduce the blast radius of future incidents.»

Was the AWS Outage caused by a cyberattack?

DNS issues can be caused by malicious actors, but there’s no evidence at this stage to say that this is the case for the AWS outage.

Technical faults can, however, pave the way for hackers to look for and exploit vulnerabilities when companies’ backs are turned and defenses are down, according to Marijus Briedis, CTO at NordVPN. «This is a cybersecurity issue as much as a technical one,» he said in a statement. «True online security isn’t only about keeping hackers out, it’s also about ensuring you can stay connected and protected when systems fail.»

In the hours ahead, people should look out for scammers hoping to take advantage of people’s awareness of the outage, added Briedis. You should be extra wary of phishing attacks and emails telling you to change your password to protect your account.

Technologies

A New Bill Aims to Ban Both Adult Content Online and VPN Use. Could It Work?

Michigan representatives just proposed a bill to ban many types of internet content, as well as VPNs that could be used to circumvent it. Here’s what we know.

On Sept. 11, Michigan representatives proposed an internet content ban bill unlike any of the others we’ve seen: This particularly far-reaching legislation would ban not only many types of online content, but also the ability to legally use any VPN.

The bill, called the Anticorruption of Public Morals Act and advanced by six Republican representatives, would ban a wide variety of adult content online, ranging from ASMR and adult manga to AI content and any depiction of transgender people. It also seeks to ban all use of VPNs, foreign or US-produced.

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VPNs (virtual private networks) are suites of software often used as workarounds to avoid similar bans that have passed in states like Texas, Louisiana and Mississippi, as well as the UK. They can be purchased with subscriptions or downloaded, and are built into some browsers and Wi-Fi routers as well.

But Michigan’s bill would charge internet service providers with detecting and blocking VPN use, as well as banning the sale of VPNs in the state. Associated fines would be up to $500,000.

What the ban could mean for VPNs

Unlike some laws banning access to adult content, this Michigan bill is comprehensive. It applies to all residents of Michigan, adults or children, targets an extensive range of content and includes language that could ban not only VPNs but any method of bypassing internet filters or restrictions.

That could spell trouble for VPN owners and other internet users who leverage these tools to improve their privacy, protect their identities online, prevent ISPs from gathering data about them or increase their device safety when browsing on public Wi-Fi.

Read more: CNET Survey: 47% of Americans Use VPNs for Privacy. That Number Could Rise. Here’s Why

Bills like these could have unintended side effects. John Perrino, senior policy and advocacy expert at the nonprofit Internet Society, mentioned to CNET that adult content laws like this could interfere with what kind of music people can stream, the sexual health forums and articles they can access and even important news involving sexual topics that they may want to read. «Additionally, state age verification laws are difficult for smaller services to comply with, hurting competition and an open internet,» John added.

The Anticorruption of Public Morals Act has not passed the Michigan House of Representatives committee nor been voted on by the Michigan Senate, and it’s not clear how much support the bill currently has beyond the six Republican representatives who have proposed it. As we’ve seen with state legislation in the past, sometimes bills like these can serve as templates for other representatives who may want to propose similar laws in their own states.

Could VPNs still get around bans like these?

That’s a complex question that this bill doesn’t really address. When I asked NordVPN how easy it would be track VPN use, privacy advocate Laura Tyrylyte explained, «From a technical standpoint, ISPs can attempt to distinguish VPN traffic using deep packet inspection, or they can block known VPN IP addresses. However, deploying them effectively requires big investments and ongoing maintenance, making large-scale VPN blocking both costly and complex.»

Also, VPNs have ways around deep packet inspection and other methods. CNET senior editor Moe Long mentioned obfuscation like NordWhisper, a counter to DPI that attempts to make VPN traffic look like normal web traffic so it’s harder to detect.

There are also no-log features offered by many VPNs to guarantee they don’t keep a record of your activity, and no-log audits from third parties like Deloitte that, well, try to guarantee the guarantee. There are even server tricks VPNs can use like RAM-only servers that automatically erase data each time they’re rebooted or shut down.

If you’re seriously concerned about your data privacy, you can look for features like these in a VPN and see if they are right for you. Changes like these, even on the state level, are one reason we pay close attention to how specific VPNs work during our testing, and make sure to recommend the right VPNs for the job, from speedy browsing to privacy while traveling.

Correction, Oct. 9: An earlier version of this story incorrectly stated how RAM-only servers work. RAM-only servers run on volatile memory and are wiped of data when they are rebooted or shut down.

Technologies

AWS Outage Explained: Why Half the Internet Went Down While You Were Sleeping

Reddit, Roblox and Ring are just a tiny fraction of the hundreds of sites and services that were impacted when Amazon Web Services went down.

The internet kicked off the week the way that many of us often feel like doing: by refusing to go to work. An outage at Amazon Web Services (AWS) rendered huge portions of the internet unavailable on Monday morning, with sites and services including Snapchat, Fortnite, Venmo, the PlayStation Network and, predictably, Amazon, unavailable for a short period of time.

AWS is a cloud services provider owned by Amazon that props up huge portions of the internet. As with the Fastly and Crowdstrike outages over the past few years, the AWS outage shows just how much of the internet relies on the same infrastructure — and how quickly our access to the sites and services we rely on can be revoked when something goes wrong.

Around 4 a.m. PT, Reddit was still down, while services including Verizon and YouTube were still seeing a significant number of reported issues.