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Tag: University of Bath

  • Women exhibit greater loss sensitivity in risky choices: study

    Women exhibit greater loss sensitivity in risky choices: study

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    Newswise — Women are less willing to take risks than men because they are more sensitive to the pain of any losses they might incur than any gains they might make, new research from the University of Bath School of Management shows.

    Published in the British Psychological Society’s British Journal of Psychology, the study – “Gender differences in optimism, loss aversion and attitudes toward risk” – also finds that men are ‘significantly’ more optimistic than women, making them more willing to take risks.

    Researcher Dr Chris Dawson, associate professor in business economics at the University of Bath School of Management, said the findings were significant and could help explain sex-specific outcomes in different employment sectors, and in financial markets.

    ‘It is widely acknowledged that men, across many domains, take more risks than women. These differences in how the sexes view risk can have significant effects,” Dr Dawson says.

    ‘For instance, differences between the sexes in risk taking can explain why women are less likely to be entrepreneurs, are underrepresented in high-paying jobs and upper management, and less likely to invest their wealth in equities markets than men. Despite these important implications, we still know very little about why women take fewer risks than men.

    “My research attempts to fill that gap. When thinking about risky choices, people tend to assess the probability of losing something alongside an evaluation of how painful that loss would be. I found that women take less risks than men as they focus more on the possibility of losing and anticipate experiencing more pain from potential losses,” he adds.

    Previous research suggests that women are more risk averse than men, and this study investigated the joint role of two psychological characteristics to explain the differences – loss aversion, the idea that losses loom larger than gains, and optimism.

    To measure loss aversion, Dr Dawson used data from 13,575 people from the UK British Household Panel Survey to assess how changes in household income from one year to the next predict changes in psychological wellbeing.

    He found that income losses are less painful for men than for women with no difference in the psychological responses to income gains between the sexes.

    When asked how they saw themselves financially a year from now with expectations about outcomes under the individual’s control, men were significantly more optimistic than women.

    The research indicates that this optimism may be linked to men’s overconfidence about their abilities compared to women which previous studies have highlighted.

    If women are both less optimistic about the probability of favourable outcomes occurring and less confident in their abilities than men, they will naturally evaluate a given gamble as being riskier, the research says.

    Overall, the study finds that women report a lower willingness to take risks than men with 53 percent of this gap accounted for by the higher levels of loss aversion amongst women and a further 3 per cent attributable to the lower levels of financial optimism amongst women.

    Loss aversion and optimism still have significant effects on risk attitudes even after controlling for the personality traits such as openness, neuroticism and extraversion.

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    University of Bath

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  • The optical fiber that keeps data safe even after being twisted or bent

    The optical fiber that keeps data safe even after being twisted or bent

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    Newswise — Optical fibres are the backbone of our modern information networks. From long-range communication over the internet to high-speed information transfer within data centres and stock exchanges, optical fibre remains critical in our globalised world.

    Fibre networks are not, however, structurally perfect, and information transfer can be compromised when things go wrong. Tßo address this problem, physicists at the University of Bath in the UK have developed a new kind of fibre designed to enhance the robustness of networks. This robustness could prove to be especially important in the coming age of quantum networks.

    The team has fabricated optical fibres (the flexible glass channels through which information is sent) that can protect light (the medium through which data is transmitted) using the mathematics of topology. Best of all, these modified fibres are easily scalable, meaning the structure of each fibre can be preserved over thousands of kilometres.

    The Bath study is published in the latest issue of Science Advances.

    Protecting light against disorder

    At its simplest, optical fibre, which typically has a diameter of 125 µm (similar to a thick strand of hair) comprises a core of solid glass surrounded by cladding. Light travels through the core, where it bounces along as though reflecting off a mirror.

    However, the pathway taken by an optical fibre as it crisscrosses the landscape is rarely straight and undisturbed: turns, loops, and bends are the norm. Distortions in the fibre can cause information to degrade as it moves between sender and receiver. “The challenge was to build a network that takes robustness into account,” said Physics PhD student Nathan Roberts, who led the research.

    “Whenever you fabricate a fibre-optic cable, small variations in the physical structure of the fibre are inevitably present. When deployed in a network, the fibre can also get twisted and bent. One way to counter these variations and defects is to ensure the fibre design process includes a real focus on robustness. This is where we found the ideas of topology useful.”

    To design this new fibre, the Bath team used topology, which is the mathematical study of quantities that remain unchanged despite continuous distortions to the geometry. Its principles are already applied to many areas of physics research. By connecting physical phenomena to unchanging numbers, the destructive effects of a disordered environment can be avoided.

    The fibre designed by the Bath team deploys topological ideas by including several light-guiding cores in a fibre, linked together in a spiral. Light can hop between these cores but becomes trapped within the edge thanks to the topological design. These edge states are protected against disorder in the structure.

    Bath physicist Dr Anton Souslov, who co-authored the study as theory lead, said: “Using our fibre, light is less influenced by environmental disorder than it would be in an equivalent system lacking topological design.

    “By adopting optical fibres with topological design, researchers will have the tools to pre-empt and forestall signal-degrading effects by building inherently robust photonic systems.”

    Theory meets practical expertise

    Bath physicist Dr Peter Mosley, who co-authored the study as experimental lead, said: “Previously, scientists have applied the complex mathematics of topology to light, but here at the University of Bath we have lots of experience physically making optical fibres, so we put the mathematics together with our expertise to create topological fibre.”

    The team, which also includes PhD student Guido Baardink and Dr Josh Nunn from the Department of Physics, are now looking for industry partners to develop their concept further.

    “We are really keen to help people build robust communication networks and we are ready for the next phase of this work,” said Dr Souslov.

    Mr Roberts added: “We have shown that you can make kilometres of topological fibre wound around a spool. We envision a quantum internet where information will be transmitted robustly across continents using topological principles.”

    He also pointed out that this research has implications that go beyond communications networks. He said: “Fibre development is not only a technological challenge, but also an exciting scientific field in its own right.

    “Understanding how to engineer optical fibre has led to light sources from bright ‘supercontinuum’ that spans the entire visible spectrum right down to quantum light sources that produce individual photons – single particles of light.”

    The future is quantum

    Quantum networks are widely expected to play an important technological role in years to come. Quantum technologies have the capacity to store and process information in more powerful ways than ‘classical’ computers can today, as well as sending messages securely across global networks without any chance of eavesdropping.

    But the quantum states of light that transmit information are easily impacted by their environment and finding a way to protect them is a major challenge. This work may be a step towards maintaining quantum information in fibre optics using topological design.

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    University of Bath

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