String theory: you love it or loathe it. To some it represents our best hope for a route to a "theory of everything"; others portray it as anything from a mathematically obtuse minefield to a quasi-religion that has precious little to do with science.
There might be a middle way. String theory's mathematical tools were designed to unlock the most profound secrets of the cosmos, but they could have a far less esoteric purpose: to tease out the properties of some of the most complex yet useful types of material here on Earth.
Both string theorists and condensed matter physicists - those studying the properties of solids, liquids and so on - are enthusiastic. "I am flabbergasted," says Jan Zaanen, a condensed matter theorist from the University of Leiden in the Netherlands. "The theory is calculating precisely what we are seeing in experiments."
If solid science does turn out to be the salvation of string theory, it would be the latest twist in a tangled history. String theory was formulated in the late 1960s to explain certain features of the strong nuclear force, one of four fundamental forces of nature. It holds that electrons, quarks and the like are not point-like particles but minuscule, curled-up, vibrating strings.
No sooner had this idea emerged, though, than it lost ground to particle physicists' "standard model", which proved capable of describing not just the strong force but also the weak and electromagnetic forces - and did so far more intuitively.
Then string theory staged a dramatic comeback when gravity resisted incorporation into the standard model, still being described by Einstein's general theory of relativity, a resolutely non-quantum theory.
But progress has been abysmally slow. "The string theorists were saying, 'Give us two more weeks and we will have explained all the big puzzles in the universe'," Prof Zaanen observes. "That was 20 years ago."
The critical voices have in the meantime been getting more strident. They complain about string theory's weird, unverifiable predictions - for instance, that space-time has any number of dimensions, usually 10, rather than the three of space and one of time we see. To its detractors, string theory is long on mathematical elegance, but woefully short on real-world relevance.
Enter a string theory curiosity with the forbidding moniker of the anti-de-Sitter/conformal field theory correspondence (AdS/CFT for short) which is at first glance a classic of the genre. Dreamed up in 1997 by Juan Maldacena, a young Argentinian then working at Harvard University, it is a special case of what is known as the "holographic principle".
The basic premise was this: much as a hologram you might find on your credit card encodes all the information for a 3D image in just two dimensions, a quantum theory in a certain number of dimensions that includes gravity can be encoded as an entirely different theory - without gravity - in one dimension fewer. The three spatial dimensions of our universe - along with gravity and us too - might, for instance, all be a holographic image generated from the interactions of particles on the cosmos's 2D boundary.
Prof Maldacena took that idea further. He was trying to do something that had consumed some of the best minds in cosmology for decades: to reconcile the behaviour of black holes, which are a core prediction of general relativity, with quantum theory. When he presented his work at a conference in Santa Barbara, California, in 1998, several hundred string theorists joined in with a specially composed song, The Maldacena, to the tune of the then-popular dance hit Macarena.
What possible relevance could this little-known theoretical conjuring trick have to the real world? Quite a lot, it seems, and in particular to the behaviour of certain types of condensed matter. That's where the tricks of the AdS/CFT correspondence come in handy. Though formulated for different circumstances, its mathematics provides a convenient bypass for a variety of problems.
Take the exotic form of matter known as the quark-gluon plasma. In normal matter, quarks and gluons are bundled together into more familiar entities like protons and neutrons. At temperatures comparable with those seen in the immensely hot first microseconds of the universe, those bonds should break down, releasing a dense fireball of quarks and gluons acting in a similar way to the atoms of a gas, with few or no interactions between them.
That, at least, is what the field theory of the strong nuclear force predicts. But in 2005, when researchers at Brookhaven National Laboratory in Upton, New York, created a quark-gluon plasma by smashing together fast moving gold ions, they saw something very different. The plasma acted not as a gas, but as a superfluid - an almost perfectly flowing liquid with virtually no viscosity. Clearly, the interactions between the quarks and gluons of this exotic state were more complex than the standard theory could easily compute. But the AdS/CFT approach produced a close match to the experimental value - a triumph for a decidedly left-field approach.
Prof Zaanen pinpoints the moment at which his area got into bed with string theory as the publication of a paper in 2007 by the Harvard theorists Sean Hartnoll, Subir Sachdev and colleagues. It applied the AdS/CFT correspondence to high-temperature superconductors - in which electrons can flow without resistance, losing no energy as heat, at temperatures as mild as 150 degrees above absolute zero.
High-temperature superconductors behave as they do because of the way electrons organise themselves in the material, but 20 years and hundreds of thousands of research papers on from their discovery, we are no closer to knowing exactly how that is. The paper by Dr Hartnoll and his colleagues concerned an effect which AdS/CFT can model in just a few lines, rather than pages of dense algebra. It was the first time that an AdS/CFT calculation had been directly pitted alongside conventional methods and tested against a real experimental result in condensed matter - and the language of black holes came up with by far the more fluent answer.
High-temperature superconductors are not the only useful materials that might benefit from the AdS/CFT approach. Prof Sachdev has used the correspondence to compute properties of the plasma of electrons found in graphene - sheets of graphite a single atom thick. Once again, this could make string theory more relevant, since graphene has been touted as a successor to silicon as the stuff of microelectronics.
www.newscientist.com
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ODI FIXTURE SCHEDULE
First ODI, October 22
Wankhede Stadium, Mumbai
Second ODI, October 25
Maharashtra Cricket Association Stadium, Pune
Third ODI, October 29
Venue TBC
Masters%20of%20the%20Air
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UAE%20medallists%20at%20Asian%20Games%202023
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What is dialysis?
Dialysis is a way of cleaning your blood when your kidneys fail and can no longer do the job.
It gets rid of your body's wastes, extra salt and water, and helps to control your blood pressure. The main cause of kidney failure is diabetes and hypertension.
There are two kinds of dialysis — haemodialysis and peritoneal.
In haemodialysis, blood is pumped out of your body to an artificial kidney machine that filter your blood and returns it to your body by tubes.
In peritoneal dialysis, the inside lining of your own belly acts as a natural filter. Wastes are taken out by means of a cleansing fluid which is washed in and out of your belly in cycles.
It isn’t an option for everyone but if eligible, can be done at home by the patient or caregiver. This, as opposed to home haemodialysis, is covered by insurance in the UAE.
UAE v IRELAND
All matches start at 10am, and will be played in Abu Dhabi
1st ODI, Friday, January 8
2nd ODI, Sunday, January 10
3rd ODI, Tuesday, January 12
4th ODI, Thursday, January 14
The specs
Engine: 2.7-litre 4-cylinder Turbomax
Power: 310hp
Torque: 583Nm
Transmission: 8-speed automatic
Price: From Dh192,500
On sale: Now
Traces%20of%20Enayat
%3Cp%3E%3Cstrong%3EAuthor%3A%3C%2Fstrong%3E%20Iman%20Mersal%3Cbr%3E%3Cstrong%3EPublisher%3A%3C%2Fstrong%3E%20And%20Other%20Stories%3Cbr%3E%3Cstrong%3EPages%3A%3C%2Fstrong%3E%20240%3C%2Fp%3E%0A
Company%20Profile
%3Cp%3E%3Cstrong%3EName%3A%20%3C%2Fstrong%3EDirect%20Debit%20System%3Cbr%3E%3Cstrong%3EStarted%3A%3C%2Fstrong%3E%20Sept%202017%3Cbr%3E%3Cstrong%3EBased%3A%3C%2Fstrong%3E%20UAE%20with%20a%20subsidiary%20in%20the%20UK%3Cbr%3E%3Cstrong%3EIndustry%3A%3C%2Fstrong%3E%20FinTech%3Cbr%3E%3Cstrong%3EFunding%3A%3C%2Fstrong%3E%20Undisclosed%3Cbr%3E%3Cstrong%3EInvestors%3A%3C%2Fstrong%3E%20Elaine%20Jones%3Cbr%3E%3Cstrong%3ENumber%20of%20employees%3A%3C%2Fstrong%3E%208%3Cbr%3E%3C%2Fp%3E%0A
THE SPECS
Engine: 3-litre V6
Transmission: eight-speed automatic
Power: 424hp
Torque: 580 Nm
Price: From Dh399,000
On sale: Now
Company%20profile
%3Cp%3E%3Cstrong%3ECompany%20name%3A%3C%2Fstrong%3E%20Fasset%0D%3Cbr%3E%3Cstrong%3EStarted%3A%20%3C%2Fstrong%3E2019%0D%3Cbr%3E%3Cstrong%3EFounders%3A%3C%2Fstrong%3E%20Mohammad%20Raafi%20Hossain%2C%20Daniel%20Ahmed%0D%3Cbr%3E%3Cstrong%3EBased%3A%3C%2Fstrong%3E%20Dubai%0D%3Cbr%3E%3Cstrong%3ESector%3A%20%3C%2Fstrong%3EFinTech%0D%3Cbr%3E%3Cstrong%3EInitial%20investment%3A%3C%2Fstrong%3E%20%242.45%20million%0D%3Cbr%3E%3Cstrong%3ECurrent%20number%20of%20staff%3A%3C%2Fstrong%3E%2086%0D%3Cbr%3E%3Cstrong%3EInvestment%20stage%3A%3C%2Fstrong%3E%20Pre-series%20B%0D%3Cbr%3E%3Cstrong%3EInvestors%3A%3C%2Fstrong%3E%20Investcorp%2C%20Liberty%20City%20Ventures%2C%20Fatima%20Gobi%20Ventures%2C%20Primal%20Capital%2C%20Wealthwell%20Ventures%2C%20FHS%20Capital%2C%20VN2%20Capital%2C%20local%20family%20offices%3C%2Fp%3E%0A
BMW%20M4%20Competition
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RECORD%20BREAKER
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IF YOU GO
The flights
FlyDubai flies direct from Dubai to Skopje in five hours from Dh1,314 return including taxes. Hourly buses from Skopje to Ohrid take three hours.
The tours
English-speaking guided tours of Ohrid town and the surrounding area are organised by Cultura 365; these cost €90 (Dh386) for a one-day trip including driver and guide and €100 a day (Dh429) for two people.
The hotels
Villa St Sofija in the old town of Ohrid, twin room from $54 (Dh198) a night.
St Naum Monastery, on the lake 30km south of Ohrid town, has updated its pilgrims' quarters into a modern 3-star hotel, with rooms overlooking the monastery courtyard and lake. Double room from $60 (Dh 220) a night.
More from Armen Sarkissian
AUSTRALIA%20SQUAD
%3Cp%3EPat%20Cummins%20(capt)%2C%20Scott%20Boland%2C%20Alex%20Carey%2C%20Cameron%20Green%2C%20Marcus%20Harris%2C%20Josh%20Hazlewood%2C%20Travis%20Head%2C%20Josh%20Inglis%2C%20Usman%20Khawaja%2C%20Marnus%20Labuschagne%2C%20Nathan%20Lyon%2C%20Mitchell%20Marsh%2C%20Todd%20Murphy%2C%20Matthew%20Renshaw%2C%20Steve%20Smith%2C%20Mitchell%20Starc%2C%20David%20Warner%3C%2Fp%3E%0A
Essentials
The flights
Emirates, Etihad and Malaysia Airlines all fly direct from the UAE to Kuala Lumpur and on to Penang from about Dh2,300 return, including taxes.
Where to stay
In Kuala Lumpur, Element is a recently opened, futuristic hotel high up in a Norman Foster-designed skyscraper. Rooms cost from Dh400 per night, including taxes. Hotel Stripes, also in KL, is a great value design hotel, with an infinity rooftop pool. Rooms cost from Dh310, including taxes.
In Penang, Ren i Tang is a boutique b&b in what was once an ancient Chinese Medicine Hall in the centre of Little India. Rooms cost from Dh220, including taxes.
23 Love Lane in Penang is a luxury boutique heritage hotel in a converted mansion, with private tropical gardens. Rooms cost from Dh400, including taxes.
In Langkawi, Temple Tree is a unique architectural villa hotel consisting of antique houses from all across Malaysia. Rooms cost from Dh350, including taxes.
Company%20Profile
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Confirmed%20bouts%20(more%20to%20be%20added)
%3Cp%3ECory%20Sandhagen%20v%20Umar%20Nurmagomedov%0D%3Cbr%3ENick%20Diaz%20v%20Vicente%20Luque%0D%3Cbr%3EMichael%20Chiesa%20v%20Tony%20Ferguson%0D%3Cbr%3EDeiveson%20Figueiredo%20v%20Marlon%20Vera%0D%3Cbr%3EMackenzie%20Dern%20v%20Loopy%20Godinez%0D%3Cbr%3E%3C%2Fp%3E%0A%3Cp%3ETickets%20for%20the%20August%203%20Fight%20Night%2C%20held%20in%20partnership%20with%20the%20Department%20of%20Culture%20and%20Tourism%20Abu%20Dhabi%2C%20went%20on%20sale%20earlier%20this%20month%2C%20through%20www.etihadarena.ae%20and%20www.ticketmaster.ae.%0D%3Cbr%3E%3C%2Fp%3E%0A
How to help
Call the hotline on 0502955999 or send "thenational" to the following numbers:
2289 - Dh10
2252 - Dh50
6025 - Dh20
6027 - Dh100
6026 - Dh200
COMPANY%20PROFILE
%3Cp%3E%3Cstrong%3ECompany%3A%3C%2Fstrong%3E%20Eco%20Way%3Cbr%3E%3Cstrong%3EStarted%3A%3C%2Fstrong%3E%20December%202023%3Cbr%3E%3Cstrong%3EFounder%3A%3C%2Fstrong%3E%20Ivan%20Kroshnyi%3Cbr%3E%3Cstrong%3EBased%3A%3C%2Fstrong%3E%20Dubai%2C%20UAE%3Cbr%3E%3Cstrong%3EIndustry%3A%3C%2Fstrong%3E%20Electric%20vehicles%3Cbr%3E%3Cstrong%3EInvestors%3A%3C%2Fstrong%3E%20Bootstrapped%20with%20undisclosed%20funding.%20Looking%20to%20raise%20funds%20from%20outside%3Cbr%3E%3C%2Fp%3E%0A
COMPANY PROFILE
Company name: BorrowMe (BorrowMe.com)
Date started: August 2021
Founder: Nour Sabri
Based: Dubai, UAE
Sector: E-commerce / Marketplace
Size: Two employees
Funding stage: Seed investment
Initial investment: $200,000
Investors: Amr Manaa (director, PwC Middle East)