Holographic Technidilaton and LHC searches

We analyze in detail the phenomenology of a model of dynamical electroweak symmetry breaking inspired by walking technicolor, by using the techniques of the bottom-up approach to holography. The model admits a light composite scalar state, the dilaton, in the spectrum. We focus on regions of parameter space for which the mass of such dilaton is 125 GeV, and for which the bounds on the precision electroweak parameter S are satisfied. This requires that the next-to-lightest composite state is the techni-rho meson, with a mass larger than 2.3 TeV. We compute the couplings controlling the decay rates of the dilaton to two photons and to two (real or virtual) Z and W bosons. For generic choices of the parameters, we find a suppression of the decay into heavy gauge bosons, in respect to the analog decay of the standard-model Higgs. We find a dramatic effect on the decay into photons, which can be both strongly suppressed or strongly enhanced, the latter case corresponding to the large-N regime of the dual theory. There is a correlation between this decay rate of the dilaton into photons and the mass splitting between the techni-rho meson and its axial-vector partner: if the decay is enhanced in respect to the standard-model case, then the heavy spin-1 resonances are nearly degenerate in mass, otherwise their separation in mass is comparable to the mass scale itself.Comment: Very minor typos corrected. References adde

Predictors of painkiller dependence among people with pain in the general population

Aims: Self-medication with painkillers is widespread and increasing, and evidence about influences on painkiller dependence is needed to inform efforts to prevent and treat problem painkiller use. Design: Online questionnaire survey. Participants: People in the general population who had pain and used painkillers in the last month (n=112). Measurements: Pain frequency and intensity, use of over-the-counter and prescription painkillers, risk of substance abuse (SOAPP scale), depression, anxiety, stress, alexithymia, pain catastrophizing, pain anxiety, pain self-efficacy, pain acceptance, mindfulness, self-compassion, and painkiller dependence (Leeds Dependence Questionnaire). Findings: In multiple regression, the independent predictors of painkiller dependence were prescription painkiller use (ß 0.21), SOAPP score (ß 0.31), and pain acceptance (ß -0.29). Prescription painkiller use mediated the influence of pain intensity. Alexithymia, anxiety and pain acceptance all moderated the influence of pain. Conclusions: The people most at risk of developing painkiller dependence are those who use prescription painkillers more frequently, who have a prior history of substance-related problems more generally, and who are less accepting of pain. Based on these findings, a preliminary model is presented with three types of influence on the development of painkiller dependence: a) pain leading to painkiller use, b) risk factors for substance-related problems irrespective of pain, and c) psychological factors related to pain. The model could guide further research among the general population and high risk groups, and acceptance-based interventions could be adapted and evaluated as methods to prevent and treat painkiller dependence.The Leonardo Da Vinci Lifelong Learning Programme funded Joana Duarte’s graduate research placement at the University of Derb

Emotion Regulation and Psychological Dependence on Pain Medication among Hospital Outpatients with Chronic Spinal Pain: The Influence of Rumination about Pain and Alexithymia

Objective: To examine the extent to which pain acceptance, pain catastrophising and alexithymia moderate associations between pain intensity and psychological pain medication dependence. Methods: Participants (106 hospital outpatients with chronic spinal pain) completed the Leeds Dependence Questionnaire (LDQ) to measure psychological dependence on pain medication, and the Chronic Pain Acceptance Questionnaire-8 (CPAQ-8), the Pain Catastrophising Scale (PCS) and the Toronto Alexithymia Scale-20 (TAS-20), plus the Depression, Anxiety and Stress Scale-21 (DASS-21). Results: Multiple linear regression showed that degree of psychological dependence (measured dimensionally across the range of LDQ scores) was associated with TAS subscale difficulty identifying feelings (DIF) (β = 0.249, p = <0.002) and PCS subscale rumination (β = 0.193, p = 0.030), independently of pain intensity and risk behaviors for medication misuse. The effect of pain intensity was moderated by rumination, with pain intensity more strongly associated with dependence when rumination was high (interaction β = 0.192, p = 0.004). Logistic regression showed that the effect of pain intensity on severe dependence (measured categorically as LDQ score ≥ 20) was moderated by alexithymia, so that severe dependence was independently associated with the combination of intense pain and high alexithymia (interaction odds ratio = 7.26, 95% CIs = 1.63–32.42, p = 0.009). Conclusions: Rumination and alexithymia moderated the associations between pain intensity and psychological pain medication dependence, consistent with emotion regulation theory. This raises the possibility that specifically targeting rumination about pain and symptoms of alexithymia could potentially improve the effectiveness of psychological interventions for chronic pain and help people to avoid or reduce their psychological dependence on pain medication

Ross's Gulls in the Central Arctic Ocean

ABSTRACT. The central Arctic Ocean is difficult to access. As a result, the bird fauna of the area, with its potential input from all around the circumpolar perimeter, is still only little known. The present paper contributes observations on the distribution of Ross’s gull (Rhodostethia rosea) made during the Arctic Ocean 96 expedition from mid-July to mid-September 1996, from the Swedish icebreaker Oden. Ross’s gull was the most common bird in the central parts of the Arctic Ocean, with a grand total of at least 131 individuals seen up to 87˚30&apos;N. Its absence further north was judged as due to an early freeze-up. A marked concentration was noted at the shelf-break north of Franz Josef Land in late July. Most Ross’s gulls were observed as single birds or two together, but some small flocks were seen, the largest consisting of 10 birds. Most birds were adults, the proportion of immature (second-year) birds being no more than 10 –15%

Ross's Gulls in the Central Arctic Ocean

The central Arctic Ocean is difficult to access, the result, the bird fauna of the area, with its potential input from all around the circumpolar perimeter, is still only little known. The present paper contributes observations on the distsribution of Ross's gull (Rhodosethia rosea) made during the Arctic Ocean 96 expedition from mid-July to mid-September 1996, from the Swedish icebreaker Oden. Ross's gull was the most common bird in the central parts of the Arctic Ocean, with a grand total at least 131 individuals seen up to 87 30 N. Its absence further north was judged as due to an early freeze-up. A marked concentration was noted at the shelf-break north of Franz Josef Land in late July. Most Ross's gulls were observed as single birds or two together, but some small flocks were seen, the largest consisting of 10 birds. Most birds were adults, the proportion of immature (second-year) birds being no more than 10-15%.Vu qu'il est difficile d'accéder à la partie centrale de l'océan Arctique, la faune aviaire de la région ainsi que l'apport à celle-ci venant de tout le périmètre circumpolaire sont relativement peu connus. Cet article présente des observations sur la distribution de la mouette rosée (Rhodostethia rosea) faites de la mi-juillet à la mi-septembre 1996 dans le cadre de l'expédition Océan Arctique 96 réalisée par le brise-glace suédois Oden. La mouette rosée était l'oiseau le plus répandu dans les régions centrales de l'océan Arctique, avec un total global d'au moins 131 individus observés jusqu'à 87° 30' de latit. N. On a interprété son absence plus au nord comme étant la conséquence d'un engel précoce. On a remarqué une forte concentration à la rupture de pente au nord de l'archipel François-Joseph à la fin juillet. La plupart des mouettes rosées ont été observées en solitaires ou en paires, mais on a aussi vu quelques petites volées dont la plus importante comptait 10 oiseaux. La plupart des mouettes étaient des adultes, la proportion des oiseaux immatures (dans leur deuxième année) ne représentant pas plus de 10 à 15 p. cent

Developing successful social support: An interpretative phenomenological analysis of mechanisms and processes in a chronic pain support group

Objective. The experience of long-term membership of a successful Chronic Pain Support Group (CPSG) was explored to identify; i) factors associated with social support, and; ii) ways that health-care professionals (HCPs) could help CPSGs become more effective and supportive. Design. Interpretative Phenomenological Analysis enabled exploration of participants’ experiences of membership and rationales for continued attendance. Main outcome measures. Twelve participants (four males, eight females), recruited from a regional CPSG, completed semi-structured interviews lasting from 45-120 minutes. Following verbatim transcription, idiographic then cross-case analyses were undertaken. Results. Three superordinate themes emerged: (1) Investing in the new normal; (2) The nurturing environment; (3) Growth facilitation through social evolution. Increased investment and identification with membership, generated snowballing social engagement, enhancing pain management/well-being through collective humour and peer-to-peer support. Explicit guidance by HCPs in early stages of group formation/development, and subsequent implicit influences on group attitudes and actions, promoted the group’s development into its current healthy, supportive state. Conclusion. Contrary to stereotypes, membership offered positive respite from chronic pain through collective coping. Successful CPSGs forge an independent identity, fostering strong group investment and an ability to live well with chronic pain. HCPs can provide a stabilising foundation for CPSGs to develop positively and supportively

Pade approximation of the S-matrix as a way of locating quantum resonances and bound states

It is shown that the spectral points (bound states and resonances) generated by a central potential of a single-channel problem, can be found using rational parametrization of the S-matrix. To achieve this, one only needs values of the S-matrix along the real positive energy axis. No calculations of the S-matrix at complex energies or a complex rotation are necessary. The proposed method is therefore universal in that it is applicable to any potential (local, non-local, discontinuous, etc.) provided that there is a way of obtaining the S-matrix (or scattering phase-shifts) at real collision energies. Besides this, combined with any method that extracts the phase-shifts from the scattering data, the proposed rational parametrization technique would be able to do the spectral analysis using the experimental data.Comment: 20 pages, 6 figure

Analytic structure and power-series expansion of the Jost function for the two-dimensional problem

For a two-dimensional quantum mechanical problem, we obtain a generalized power-series expansion of the S-matrix that can be done near an arbitrary point on the Riemann surface of the energy, similarly to the standard effective range expansion. In order to do this, we consider the Jost-function and analytically factorize its momentum dependence that causes the Jost function to be a multi-valued function. The remaining single-valued function of the energy is then expanded in the power-series near an arbitrary point in the complex energy plane. A systematic and accurate procedure has been developed for calculating the expansion coefficients. This makes it possible to obtain a semi-analytic expression for the Jost-function (and therefore for the S-matrix) near an arbitrary point on the Riemann surface and use it, for example, to locate the spectral points (bound and resonant states) as the S-matrix poles. The method is applied to a model simlar to those used in the theory of quantum dots.Comment: 42 pages, 9 figures, submitted to J.Phys.