6,898 research outputs found
Yang-Mills Chern-Simons Corrections From the Pure Spinor Superstring
Nilpotency of the pure spinor BRST operator in a curved background implies
superspace equations of motion for the background. By computing one-loop
corrections to nilpotency for the heterotic sigma model, the Yang-Mills
Chern-Simons corrections to the background are derived.Comment: 25 pages, harvmac tex, 15 diagrams; references adde
Heterotic '-corrections in Double Field Theory
We extend the generalized flux formulation of Double Field Theory to include
all the first order bosonic contributions to the expansion of the
heterotic string low energy effective theory. The generalized tangent space and
duality group are enhanced by corrections, and the gauge symmetries
are generated by the usual (gauged) generalized Lie derivative in the extended
space. The generalized frame receives derivative corrections through the spin
connection with torsion, which is incorporated as a new degree of freedom in
the extended bein. We compute the generalized fluxes and find the Riemann
curvature tensor with torsion as one of their components. All the
four-derivative terms of the action, Bianchi identities and equations of motion
are reproduced. Using this formalism, we obtain the first order
corrections to the heterotic Buscher rules. The relation of our results to
alternative formulations in the literature is discussed and future research
directions are outlined.Comment: Published versio
Team Edward or Team Jacob? The Portrayal of Two Versions of the Ideal Male Romantic Partner in the Twilight Film Series
The popularity of the Twilight saga, enhanced by the film adaptations of the books, sparked a series of interesting reactions of fans. One was the creation of “Team Edward” and “Team Jacob,” in which fans aligned with one or the other character and argue about which one of them could be a better romantic partner. This study explores the messages the movies are sending to young girls around the world about what are the traits of the “ideal” male romantic partner as portrayed through the characters of Edward and Jacob. A textual analysis of the first three movie adaptations of the saga, Twilight (2008), New Moon (2009), and Eclipse (2010) was conducted. Based in social cognitive theory and using a feminist critical approach, I argue that these messages might be teaching young girls lessons about relationships that are up to certain degree dangerous, some of them perpetuating patriarchy
Short Range Interactions in the Hydrogen Atom
In calculating the energy corrections to the hydrogen levels we can identify
two different types of modifications of the Coulomb potential , with one
of them being the standard quantum electrodynamics corrections, ,
satisfying over the whole range of
the radial variable . The other possible addition to is a potential
arising due to the finite size of the atomic nucleus and as a matter of fact,
can be larger than in a very short range. We focus here on the latter
and show that the electric potential of the proton displays some undesirable
features. Among others, the energy content of the electric field associated
with this potential is very close to the threshold of pair production.
We contrast this large electric field of the Maxwell theory with one emerging
from the non-linear Euler-Heisenberg theory and show how in this theory the
short range electric field becomes smaller and is well below the pair
production threshold
A group from a map and orbit equivalence
In two papers published in 1979, R. Bowen and R. Bowen and C. Series
introduced a dynamical system from a Fuchsian group, acting on the hyperbolic
plane . The dynamics is a map on which is, in particular,
an expanding piecewise homeomorphism of the circle. In this paper we consider a
reverse question: which dynamical conditions for an expanding piecewise
homeomorphism of are sufficient for the map to be a ``Bowen-Series-type"
map (see below) for some group and which groups can occur? We give a
partial answer to these questions.Comment: 46 pages, 8 figure
Child externalising and internalising behaviour and parental wellbeing during the Covid-19 pandemic
In this study we surveyed families' experiences with parental depression, stress, relationship conflict and child behavioural issues during 6 months of the coronavirus (Covid-19) pandemic through the Covid-19: Global Social Trust and Mental Health Study. The current analyses used data collected from online surveys completed by adults in 66 countries from 17 April 2020 to 13 July 2020 (Wave I), followed by surveys 6 months later at Wave II (17 October 2020-31 January 2021). Analyses were limited to 175 adult parents who reported living with at least one child under 18 years old at Wave I. Parents reported on children's level of externalising and internalising behaviour at Wave I. At Wave II, parents completed self-reported measures of stress, depression and inter-partner conflict. Child externalising behaviour at Wave I significantly predicted higher levels of parental stress at Wave II, controlling for covariates. Child internalising behaviour at Wave I did not predict parental stress or depression, controlling for covariates. Neither child externalising nor internalising behaviour predicted parental relationship conflict. The overall findings demonstrate that child behaviour likely influenced parental stress during the Covid-19 pandemic. Findings suggest that mental health interventions for children and parents may improve the family system during times of disaster
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