Tag Archives: Nobel

A Nobel Tradition

Content Developer Rupert Cole explores the most famous science prize of all, and some of its remarkable winners. 

Today, science’s most prestigious and famous accolades will be awarded in Stockholm: the Nobel Prize.

Before we raise a toast to this years’ winners in physics, Peter Higgs and Belgian François Englert, let’s take a look back at the man behind the Prize, and some of its winners.

Alfred Nobel

A Swedish explosives pioneer who made his millions from inventing dynamite, Alfred Nobel left in his will a bequest to establish an annual prize for those who have “conferred the greatest benefit to mankind”, across five domains: physics, chemistry, physiology or medicine, literature and peace. To this end, he allocated the majority of his enormous wealth.

Alfred Nobel. Credit: Science Museum / SSPL

Alfred Nobel. Credit: Science Museum / SSPL

When Nobel’s will was read after his death in 1896, the prize caused an international controversy. Unsurprisingly, Nobel’s family were not best pleased, and vigorously opposed its establishment. It took five years before it was finally set up and the first lot awarded – the 1901 physics accolade going to Wilhelm Rontgen for his 1895 discovery of x-rays.

Paul Dirac’s maternal mortification

When the phone rang on 9 November 1933, the exceptionally gifted yet eccentric Paul Dirac was a little taken back to hear a voice from Stockholm tell him he had won the Nobel Prize.

The looming press attention, which had always surrounded the Nobels, made the reclusive Dirac consider rejecting the award, until Ernest Rutherford – JJ Thomson’s former student and successor as Cavendish professor – advised him that a “refusal will get you more publicity”.

Under different circumstances Rutherford had been similarly “startled” when he found out he was to be given a Nobel – a physicist through and through, he was awarded the 1908 Prize in Chemistry, joking his sudden “metamorphosis into a chemist” was very unexpected.

Dirac shared the 1933 physics prize with Erwin Schrödinger – famed for his eponymous equation and dead-and-alive cat – for their contributions to quantum mechanics. Each was allowed one guest at the award ceremony held at the Swedish Royal Academy of Science. Schrödinger brought his wife, Dirac brought his mother.

Quantum theorists: Wolfgang Pauli and Paul Dirac, 1938. Credit: CERN

Quantum theorists: Wolfgang Pauli and Paul Dirac, 1938. Credit: CERN

Florence Dirac did what all good mothers do: embarrass her son in every way imaginable. The first incident came at a station café in Malmo, where in this unlikely setting an impromptu press conference took place.

Dirac, who had been described by the British papers as “shy as a gazelle and modest as a Victorian maid,” was asked “did the Nobel Prize come as a surprise?” Before he could answer, Dirac’s mother butted in: “Oh no, not particularly, I have been waiting for him to receive the prize as hard as he has been working.”

The next embarrassment came when Mrs Dirac failed to wake up when the train reached Stockholm. She was ejected by a guard, who had thrown her garments and belongings out of the carriage window. The Diracs arrived late, and meekly hid from the attention of the welcoming party – who had been wondering where they were.

The third and final maternal faux pas came at Stockholm’s Grand Hotel. The pair had been booked into the finest room – the bridal suite. Mrs Dirac, displeased, demanded a room of her own, which Dirac paid for out of his own pocket. It doesn’t matter if you’ve co-founded quantum mechanics, predicted antimatter and won the Nobel Prize; mothers will be mothers.

Peter’s Pride

Like other humble laureates before him, Peter Higgs wished to duck out of the press furore surrounding the Nobel. At the time of the announcement on the 8th October there was a nail-biting delay. The cause? The Nobel committee could not get hold of Higgs, who had turned his phone off and planned to escape to the Scottish Highlands.

As Peter Higgs revealed to me at the opening of the Collider exhibition at the Science Museum, if it was not for a dodgy Volkswagen beetle or public transport, Peter would have made it to the Highlands on Nobel day. Instead, he just laid low in Edinburgh.

Peter Higgs (right) with friend Alan Walker and the personalised bottles of London Pride at Collider opening. Credit: Science Museum.

Peter Higgs (right) with friend Alan Walker and the personalised bottles of London Pride at Collider exhibition opening. Credit: Science Museum.

At the Collider launch last month, we celebrated with Higgs in the appropriate way: over a personalised bottle of London Pride ale – the same beverage he chose in favour of champagne on the flight home from CERN’s public announcement of the Higgs boson discovery. So, when Englert and Higgs receive the honour today, let’s all raise two glasses: an English Ale and a Belgian Blonde!

For more on many of the Nobel prize-winning discoveries in physics history, including those of Dirac, Englert and Higgs, visit the Collider exhibition at the Science Museum.

The last particle?

Could the Higgs be the end of particle physics? We’re still a long way from answering one of the biggest questions of all, says Dr Harry Cliff, Head of Content on our Collider exhibition.

The 2013 Nobel Prize in Physics has been awarded to François Englert and Peter Higgs for their work that explains why subatomic particles have mass. They predicted the existence of the Higgs boson, a fundamental particle, which was confirmed last year by experiments conducted at CERN’s Large Hadron Collider.

But today’s celebrations mask a growing anxiety among physicists. The discovery of the Higgs boson is an undoubted triumph, but many note that it hasn’t brought us any closer to answering some of the most troubling problems in fundamental science.

A senior physicist went so far as to tell me that he was “totally unexcited by the discovery of the Higgs boson”. Though not the typical reaction, this discovery threatens to close a chapter of 20th century physics without a hint of how to start writing the next page.

Until July last year, when physicists at the Large Hadron Collider (LHC) announced its discovery, the Higgs boson remained the last missing piece of the Standard Model of particle physics, a theory that describes all the particles that make up the world we live in with stunning accuracy. The Standard Model has passed every experimental test thrown at it with flying colours, and yet has some rather embarrassing holes.

According to astronomical measurements, the matter described by the Standard Model that makes up the stars, planets and ultimately us, only accounts for a tiny fraction of the universe. We appear to be a thin layer of froth, floating on top of an invisible ocean of dark matter and dark energy, about which we know almost nothing.

Worse still, according to the Standard Model, we shouldn’t exist at all. The theory predicts that, after the Big Bang, equal quantities of matter and antimatter should have obliterated each other, leaving an empty universe.

Both of these are good scientific reasons to doubt that the Standard Model is the end of the story when it comes to the laws of physics. But there is another, aesthetic principle that has led many physicists to doubt its completeness – the principle of “naturalness”.

The Standard Model is regarded as a highly “unnatural” theory. Aside from having a large number of different particles and forces, many of which seem surplus to requirement, it is also very precariously balanced. If you change any of the 20+ numbers that have to be put into the theory even a little, you rapidly find yourself living in a universe without atoms. This spooky fine-tuning worries many physicists, leaving the universe looking as though it has been set up in just the right way for life to exist.

The Higgs’s boson provides us with one of the worst cases of unnatural fine-tuning. A surprising discovery of the 20th century was the realisation that empty space is far from empty. The vacuum is, in fact, a broiling soup of invisible “virtual” particles, constantly popping in and out of existence.

The conventional wisdom states that as the Higgs boson passes through the vacuum it interacts with this soup of virtual particles and this interaction drives its mass to an absolutely enormous value – potentially up to a hundred million billion times larger than the one measured at the LHC.

Theorists have attempted to tame the unruly Higgs mass by proposing extensions of the Standard Model. The most popular of which is “supersymmetry”, which introduces a heavier super-particle or “sparticle” for every particle in the Standard Model. These sparticles cancel out the effect of the virtual particles in the vacuum, reducing the Higgs mass to a reasonable value and eliminating the need for any unpleasant fine-tuning.

Supersymmetry has other features that have made it popular with physicists. Perhaps its best selling point is that one of these sparticles provides a neat explanation for the mysterious dark matter that makes up about a quarter of the universe.

Although discovering the Higgs boson may have been put forward as the main reason for building the 27km Large Hadron Collider (LHC), what most physicists have really been waiting for is a sign of something new. As Higgs himself said shortly after the discovery last year, “[The Higgs boson] is not the most interesting thing that the LHC is looking for”.

So far however, the LHC has turned up nothing.

If supersymmetry is really responsible for keeping the Higgs boson’s mass low, then sparticles should show up at energies not much higher than where the LHC found the Higgs. The fact that nothing has been found has already ruled out many popular forms of supersymmetry.

This has led some theorists to abandon naturalness altogether. One relatively new idea known as “split-supersymmetry” accepts fine-tuning in the Higgs mass, but keeps the other nice features of supersymmetry, like a dark matter particle.

This may sound like a technical difference, but the implications for the nature of our universe are profound. The argument is that we live in a fine-tuned universe because it happens to be one among an effectively infinite number of different universes, each with different laws of physics. The constants of nature are what they are because if they were different atoms could not form, and hence we wouldn’t be around to wonder about them.

This anthropic argument is in part motivated by developments in string theory, a potential “theory of everything”, for which there are a vast number (roughly 10500) different possible universes with different laws of physics. (This huge number of universes is often used as a criticism of string theory, sometimes derided as a “theory of everything else” as no one has so far found a solution that corresponds to the universe we live in.) However, if split-supersymmetry is right, the lack of new physics at the LHC could be indirect evidence for the existence of the very multiverse anticipated by string theory.

All of this could be rather bad news for the LHC. If the battle for naturalness is lost, then there is no reason why new particles must appear in the next few years. Some physicists are campaigning for an even larger collider, four times longer and seven times more powerful than the LHC.

This monster collider could be used to settle the question once and for all, but it’s hard to imagine that such a machine will get the go ahead, especially if the LHC fails to find anything beyond the Higgs.

We are at a critical juncture in particle physics. Perhaps after it restarts the LHC in 2015, it will uncover new particles, naturalness will survive and particle physicists will stay in business. There are reasons to be optimistic. After all, we know that there must be something new that explains dark matter, and there remains a good chance that the LHC will find it.

But perhaps, just perhaps, the LHC will find nothing. The Higgs boson could be particle physics’ swansong, the last particle of the accelerator age. Though a worrying possibility for experimentalists, such a result could lead to a profound shift in our understanding of the universe, and our place in it.

Discover more about the Higgs boson and the world’s largest science experiment in our new exhibition, Collider, opening on 13th November 2013.

This article first appeared on The Conversation.