Results for "Per Bjerkeli"

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Externally heated protostellar cores in the Ophiuchus star-forming regionNov 21 2016Nov 22 2016We present APEX 218 GHz observations of molecular emission in a complete sample of embedded protostars in the Ophiuchus star-forming region. To study the physical properties of the cores, we calculate H$_2$CO and c-C$_3$H$_2$ rotational temperatures, ... More
Resolved images of a protostellar outflow launched by an extended disk windDec 15 2016Young stars are associated with prominent outflows of molecular gas. The ejection of gas via these outflows is believed to remove angular momentum from the protostellar system, thus permitting young stars to grow by accretion of material from the protostellar ... More
Evidence for the start of planet formation in a young circumstellar diskJun 25 2018The growth of dust grains in protoplanetary disks is a necessary first step towards planet formation. This growth has been inferred via observations of thermal dust emission towards mature protoplanetary systems (age >2 million years) with masses that ... More
The ALMA-PILS survey: The sulphur connection between protostars and comets: IRAS 16293-2422 B and 67P/Churyumov-GerasimenkoFeb 08 2018Feb 21 2018The evolutionary past of our Solar System can be pieced together by comparing analogous low-mass protostars with remnants of our Protosolar Nebula - comets. Sulphur-bearing molecules may be unique tracers of the joint evolution of the volatile and refractory ... More
Externally heated protostellar cores in the Ophiuchus star-forming regionNov 21 2016We present APEX 218 GHz observations of molecular emission in a complete sample of embedded protostars in the Ophiuchus star-forming region. To study the physical properties of the cores, we calculate H$_2$CO and c-C$_3$H$_2$ rotational temperatures, ... More
A young bipolar outflow from IRAS 15398-3359Jan 26 2016Changing physical conditions in the vicinity of protostars allow for a rich and interesting chemistry to occur. Heating and cooling of the gas allows molecules to be released from and frozen out on dust grains. These changes in physics, traced by chemistry, ... More
Stars and gas in the Medusa mergerAug 28 2008The Medusa (NGC 4194) is a well-studied nearby galaxy with the disturbed appearance of a merger and evidence for ongoing star formation. In order to test whether it could be the result of an interaction between a gas-rich disk-like galaxy and a larger ... More
Do zeta functions for intermittent maps have branch points?Sep 19 1996We present numerical evidence that the dynamical zeta function and the Fredholm determinant of intermittent maps with a neutral fix point have branch point singularities at z=1 We consider the power series expansion of zeta function and the Fredholm determinant ... More
Resonance spectra and a periodic orbit sum rule for bound chaotic systemsAug 12 1993We consider the spectrum of the evolution operator for bound chaotic systems by evaluating its trace. This trace is known to approach unity as $t \rightarrow \infty$ for bound systems. It is written as the Fourier transform of the logaritmic derivative ... More
Hard thermal loops in a magnetic field and the chiral anomalyAug 08 1996The fermionic dispersion relation in the presence of a background magnetic field and a high temperature QED plasma is calculated exactly in the external field, using the Hard Thermal Loop effective action. As the field strength increases there is a smooth ... More
Everett's Missing Postulate and the Born RuleFeb 14 2019Everett's Relative State Interpretation (aka Many Worlds Interpretation) has gained increasing interest due to the progress understanding the role of decoherence. In order to fulfill its promise as a realistic description of the physical world, two postulates ... More
Multiphasic profiles for the ion activities of NaBr and KBrDec 19 2017The preceding paper (Nissen 2017) shows multiphasic profiles, straight lines separated by discontinuous transitions, for the ion activities of NaCl and KCl at 15, 25, 35 and 45oC based on very precise tabular data of Lee et al. (2002). In addition, references ... More
Multiphasic interactions between nucleotides and target proteinsAug 26 2016The nucleotides guanosine tetraphosphate (ppGpp) and guanosine pentaphosphate (pppGpp) bind to target proteins to promote bacterial survival (Corrigan et al. 2016). Thus, the binding of the nucleotides to RsgA, a GTPase, inhibits the hydrolysis of GTP. ... More
Polynomials defined by tableaux and linear recurrencesMay 11 2015May 28 2015We show that several families of polynomials defined via fillings of diagrams satisfy linear recurrences under a natural operation on the shape of the diagram. We focus on key polynomials, (also known as Demazure characters), and Demazure atoms. The same ... More
Competing interaction in magnets: the root of ordered disorder or only frustration?Nov 06 2013What does the equilibrium atomic, molecular or spin configuration of a glass phase look like? Is there only one unique equilibrium configuration or are there infinitely many configurations of equal energy? The processes and mechanisms governing the path ... More
Interference Alignment (IA) and Coordinated Multi-Point (CoMP) with IEEE802.11ac feedback compression: testbed resultsNov 05 2013Feb 19 2014We have implemented interference alignment (IA) and joint transmission coordinated multipoint (CoMP) on a wireless testbed using the feedback compression scheme of the new 802.11ac standard. The performance as a function of the frequency domain granularity ... More
Introduction to the method of multiple scalesDec 12 2013Apr 07 2016Earlier versions of these lecture notes have been used at the Cork Summerschool on Theory and Mathematics Modelling of Ultrashort Pulse Propagation (2013), and as a part of a graduate course in the theory of nonlinear waves in the period 2014-2016. This ... More
Combinatorial proof of the skew K-saturation theoremJul 15 2013Jun 27 2014We give a combinatorial proof of the skew Kostka analogue of the K-saturation theorem. More precisely, for any positive integer k, we give an explicit injection from the set of skew semistandard Young tableaux with skew shape k\lambda/k\mu{} and type ... More
On the density of rational and integral points on algebraic varietiesAug 17 2005Mar 13 2006We prove a conjecture of Heath-Brown on the number of rational points of bounded height for a large class of projective varieties.
Nonequilibrium thermodynamics of interacting tunneling transport: variational grand potential, density-functional formulation, and nature of steady-state forcesAug 23 2011Oct 09 2012The standard formulation of tunneling transport rests on an open-boundary modeling. There, conserving approximations to nonequilibrium Green function or quantum-statistical mechanics provide consistent but computational costly approaches; alternatively, ... More
Schur polynomials, banded Toeplitz matrices and Widom's formulaAug 28 2012We prove that for arbitrary partitions $\mathbf{\lambda} \subseteq \mathbf{\kappa},$ and integers $0\leq c<r\leq n,$ the sequence of Schur polynomials $S_{(\mathbf{\kappa} + k\cdot \mathbf{1}^c)/(\mathbf{\lambda} + k\cdot \mathbf{1}^r)}(x_1,...,x_n)$ ... More
Dispersion relations from the Hard Thermal Loop effective action in a magnetic fieldOct 17 1995Dispersion relations for fermions at high temperature and in a background magnetic field are calculated in two different ways. First from a straightforward one-loop calculation where, in the weak field limit, we find an expression closely related to the ... More
Postulates for and measurements in Everett's quantum mechanicsMar 03 2016Mar 20 2016Everetts Relative State Interpretation (aka Many Worlds Interpretation) has gained increasing interest due the progress understanding the role of decoherence. In order to fullfil its promise as an intellectually economic realistic description of the physical ... More
Anomalies at high temperatureFeb 23 1998The anomaly equation can be derived from the ultraviolet properties of quantum field theory and should, therefore, not depend on infrared properties, such as the presence of a thermal heat bath. There is also an infrared explanation of anomalies which ... More
From chaotic to disordered systems - a periodic orbit approachFeb 26 1998We apply periodic orbit theory to a quantum billiard on a torus with a variable number N of small circular scatterers distributed randomly. Provided these scatterers are much smaller than the wave length they may be regarded as sources of diffraction. ... More
Hawking Radiation from Black Holes Formed During Quantum TunnelingMar 28 1994Mar 28 1994We study the behaviour of scalar fields on background geometries which undergo quantum tunneling. The two examples considered are a moving mirror in flat space which tunnels through a potential barrier, and a false vacuum bubble which tunnels to form ... More
First determination of the electric charge of the top quarkFeb 01 2007In this thesis, the first determination of the electric charge of the top quark is presented using 370pb-1 of data recorded by the D0 detector at the Fermilab Tevatron accelerator. ttbar events are selected with one isolated electron or muon and at least ... More
Surface assembly and ultrafast operation of all-nanoscale resonant-tunneling transistorsSep 01 2003Oct 12 2011Realization of a robust nanotube-heterostructure tunneling transistors [Solid State Comm. 116, p. 569 (2000)] requires the difficult formation [Science 293, p. 76 (2001)] of a central nanoscale barrier separating a pair of outside metallic leads. Here ... More
Three-Neutrino MSW Effect and the Lehmann Mass MatrixOct 22 2002Recent work on analytical solutions to the MSW equations for three neutrino flavours is reviewed, with emphasis on the exponential density. Application to a particular mass matrix, proposed by Lehmann, Newton and Wu, is also discussed. Within this model, ... More
Spin(p+1,p+1) Covariant Dp-brane Bound StatesNov 30 2000We construct Spin(p+1,p+1) covariant Dp-brane bound states by using that the potentials in the RR sector of toroidically compactified type II supergravity transform as a chiral spinor of the T-duality group. As an application, we show the invariance of ... More
Model of Outgrowths in the Spiral Galaxies NGC 4921 and NGC 7049 and the Origin of Spiral ArmsNov 15 2012NGC 4921 and 7049 are two spiral galaxies presenting narrow, distinct dust features. A detailed study of the morphology of those features has been carried out using Hubble Space Telescope archival images. NGC 4921 shows a few but well-defined dust arms ... More
Discriminants, symmetrized graph monomials, and sums of squares certificatesFeb 02 2012Here we present certificates for 5 classes of 6-edged multigraphs whose symmetrized graph monomials may be represented as sum of squares, but not as linear combinations of partition square graphs. This is a complement to the results presented in Discriminants, ... More
On eigenvalues of the Schrödinger operator with an even complex-valued polynomial potentialApr 04 2011In this paper, we generalize several results of the article "Analytic continuation of eigenvalues of a quartic oscillator" of A. Eremenko and A. Gabrielov. We consider a family of eigenvalue problems for a Schr\"odinger equation with even polynomial potentials ... More
Unsupervised Learning through Temporal Smoothing and Entropy MaximizationMay 08 2019This paper proposes a method for machine learning from unlabeled data in the form of a time-series. The mapping that is learned is shown to extract slowly evolving information that would be useful for control applications, while efficiently filtering ... More
Gelfand-Tsetlin polytopes and the integer decomposition propertyMay 19 2014Nov 25 2015Let $P$ be the Gelfand--Tsetlin polytope defined by the skew shape $\lambda/\mu$ and weight $w$. In the case corresponding to a standard Young tableau, we completely characterize for which shapes $\lambda/\mu$ the polytope $P$ is integral. Furthermore, ... More
Non-symmetric Macdonald polynomials and Demazure-Lusztig operatorsFeb 16 2016Apr 15 2016We extend the family non-symmetric Macdonald polynomials and define general-basement Macdonald polynomials. We show that these also satisfy a triangularity property with respect to the monomials bases and behave well under the Demazure-Lusztig operators. ... More
A strict epistemic approach to physicsJan 04 2016Mar 01 2017The general view is that all fundamental physical laws should be formulated within the framework given by quantum mechanics (QM). In a sense, QM therefore has the character of a metaphysical theory. Consequently, if it is possible to derive QM from more ... More
Discontinuous transitions: Multiphasic profiles for channels, binding, pH, folding and chain lengthNov 20 2015Dec 07 2015A wide variety of biological as well as non-biological processes and phenomena involving ion channels, binding, pH, folding/unfolding and effects of chain length are well represented by multiphasic profiles, a series of straight lines separated by discontinuous ... More
On the effect of pruning on the singularity structure of zeta functionsJun 13 1996We investigate the topological zeta function for unimodal maps in general and dynamical zeta functions for the tent map in particular. For the generic situation, when the kneading sequence is aperiodic, it is shown that the zeta functions have a natural ... More
On the duality between periodic orbit statistics and quantum level statisticsFeb 01 1995We discuss consequences of a recent observation that the sequence of periodic orbits in a chaotic billiard behaves like a poissonian stochastic process on small scales. This enables the semiclassical form factor $K_{sc}(\tau)$ to agree with predictions ... More
Lyapunov exponents and anomalous diffusion of a Lorentz gas with infinite horizon using approximate zeta functionsJan 02 1995We compute the Lyapunov exponent, generalized Lyapunov exponents and the diffusion constant for a Lorentz gas on a square lattice, thus having infinite horizon. Approximate zeta functions, written in terms of probabilities rather than periodic orbits, ... More
Approximate zeta functions for the Sinai billiard and related systemsFeb 24 1994We discuss zeta functions, and traces of the associated weighted evolution operators for intermittent Hamiltonian systems in general and for the Sinai billiard in particular. The intermittency of this billiard is utilized so that the zeta functions may ... More
A strict epistemic approach to physicsJan 04 2016Apr 23 2016The general view is that all fundamental physical laws should be formulated within the framework given by quantum mechanics (QM). In a sense, QM therefore has the character of a metaphysical theory. Consequently, if it is possible to derive QM from more ... More
Spin-Orbit Interaction from Matrix TheorySep 28 1997Oct 27 1997We study the leading order spin dependence of graviton scattering in eleven dimensions, and show that the results obtained from supergravity and from Matrix Theory precisely agree.
Non-thermal aspects of black hole radianceAug 04 1995The phenomenon of black hole thermodynamics raises several deep issues which any proper theory of quantum gravity must confront: to what extent does the inclusion of the back-reaction alter the thermal character of the radiation, how can the entropy be ... More
On localization of Schrödinger meansApr 04 2017Localization properties for Schr\"odinger means are studied in dimension higher than one.
Multiphasic profiles for voltage-dependent K+ channels: Reanalysis of data of MacKinnon and coworkersJun 09 2016In a study of the role that voltage-dependent K+ channels may have in the mechanosensation of living cells (Schmidt et al. Proc Soc Natl Acad Sci USA 109: 10352-10357. 2012), the data were as conventionally done fitted by a Boltzmann function. However, ... More
Profiles for voltage-activated currents are multiphasic, not curvilinearMar 16 2016Data for voltage-activation of a potassium channel (Matulef et al. Proc Natl Acad Sci USA 110: 17886-17891. 2013) were, as conventionally done, fitted by the authors by a Boltzmann function, i.e. by a curvilinear profile. Reanalysis of the data reveals ... More
Postulates and measurements in Everett's Quantum MechanicsMar 03 2016Mar 08 2017Everett's Relative State Interpretation (aka Many Worlds Interpretation) has gained increasing interest due to the progress understanding the role of decoherence. In order to fulfill its promise as an intellectually economic realistic description of the ... More
Multiphasic pH profiles for the reaction of tris-(hydroxymethyl)-aminomethane with phenyl estersDec 08 2015Reanalysis of data (Bruice and York 1961) for the pH dependences of the calculated apparent second-order rate constants (k2) for the reaction of tris-(hydroxymethyl)-aminomethane (TRIS) with phenyl esters reveals that the pH profiles are consistently ... More
Generalizing the Markov and covariance interpolation problem using input-to-state filtersApr 07 2011In the Markov and covariance interpolation problem a transfer function $W$ is sought that match the first coefficients in the expansion of $W$ around zero and the first coefficients of the Laurent expansion of the corresponding spectral density $WW^\star$. ... More
Improved Inapproximability For Submodular MaximizationApr 21 2010We show that it is Unique Games-hard to approximate the maximum of a submodular function to within a factor 0.695, and that it is Unique Games-hard to approximate the maximum of a symmetric submodular function to within a factor 0.739. These results slightly ... More
The AdS(4) x CP(3) string and its Bethe equations in the near plane wave limitNov 17 2008Nov 23 2008We perform a detailed study of bosonic type IIA string theory in a large light-cone momentum / near plane wave limit of $AdS_4 \times CP_3$. In order to attain this we derive the Hamiltonian up to cubic and quartic order in number of fields and calculate ... More
Dark mammoth trunks in the merging galaxy NGC 1316 and a mechanism of cosmic double helicesMar 30 2010NGC 1316 is a giant, elliptical galaxy containing a complex network of dark, dust features. The morphology of these features has been examined in some detail using a Hubble Space Telescope, Advanced Camera for Surveys image. It is found that most of the ... More
Density-functional theory of nonequilibrium tunnelingJul 28 2008Aug 03 2008Nanoscale optoelectronics and molecular-electronics systems operate with current injection and nonequilibrium tunneling, phenomena that challenge consistent descriptions of the steady-state transport. The current affects the electron-density variation ... More
LLT polynomials, elementary symmetric functions and melting lollipopsMar 10 2019Mar 19 2019We conjecture an explicit positive combinatorial formula for the expansion of unicellular LLT polynomials in the elementary symmetric basis. This is an analogue of the Stanley--Stembridge conjecture and previously studied by Panova and the author in 2018. ... More
Dynamics of Anti-de Sitter Domain WallsOct 18 1999Oct 26 1999We study solutions corresponding to moving domain walls in the Randall-Sundrum universe. The bulk geometry is given by patching together black hole solutions in AdS$_5$, and the motion of the wall is determined from the junction equations. Observers on ... More
Spin Glasses: Model systems for non-equilibrium dynamicsSep 26 2003Spin glasses are frustrated magnetic systems due to a random distribution of ferro- and antiferromagnetic interactions. An experimental three dimensional (3d) spin glass exhibits a second order phase transition to a low temperature spin glass phase regardless ... More
Magnetic Vortices in High Temperature SuperconductorsFeb 05 2001Feb 06 2001It is suggested that modes, observed in recent neutron scattering experiments by Lake {\it et al.}, on La$_{2-x}$Sr$_x$CuO$_4$ in strong magnetic fields ($\approx$ 7 T), are due to the existence of antiferromagnetic moments associated with the cores of ... More
Notes on formal deformations of quantum planes and universal enveloping algebrasNov 30 2018Feb 05 2019In these notes, we introduce formal hom-associative deformations of the quantum planes and the universal enveloping algebras of the two-dimensional non-abelian Lie algebras. We then show that these deformations induce formal hom-Lie deformations of the ... More
The Lyapunov exponent in the Sinai billiard in the small scatterer limitJan 11 1996We show that Lyapunov exponent for the Sinai billiard is $\lambda = -2\log(R)+C+O(R\log^2 R)$ with $C=1-4\log 2+27/(2\pi^2)\cdot \zeta(3)$ where $R$ is the radius of the circular scatterer. We consider the disk-to-disk-map of the standard configuration ... More
Temperature Renormalization Group and ResummationSep 25 1992The temperature renormalization group equation (TRGE) is compared with a diagrammatic expansion for the $(\phi^4)_4$-theory. It is found that the one-loop TRGE resums the leading powers of temperature for the effective mass. A two-loop contribution to ... More
Finite Temperature Renormalization of the $(φ^3)_6$- and $(φ^4)_4$-Models at Zero MomentumJun 22 1992A self-consistent renormalization scheme at finite temperature and zero momentum is used together with the finite temperature renormalization group to study the temperature dependence of the mass and the coupling to one-loop order in the $(\phi^3)_6$- ... More
'Perfectly' curvilinear profiles for binding as determined by ITC may in fact be multiphasicJun 29 2016In a structural analysis of the proteasome activator PafE in Mycobacterium tuberculosis, the binding of the activator or shorter constructs to the 20S proteasome core particle (20S CP) or derivatives was measured by isothermal titration calorimetry (Bai ... More
Stretched skew Schur polynomials are recurrentOct 01 2012We show that sequences of skew Schur polynomials obtained from stretched semi-standard Young tableaux satisfy a linear recurrence, which we give explicitly. Using this, we apply this to finding certain asymptotic behavior of these Schur polynomials and ... More
The ATLAS b-Jet TriggerNov 17 2011The online event selection is crucial to reject most of the events containing uninteresting background collisions while preserving as much as possible the interesting physical signals. The b-jet selection is part of the trigger strategy of the ATLAS experiment ... More
Approximative Covariance InterpolationApr 11 2011When methods of moments are used for identification of power spectral densities, a model is matched to estimated second order statistics such as, e.g., covariance estimates. If the estimates are good there is an infinite family of power spectra consistent ... More
Lectures on black holes and the AdS_3 / CFT_2 correspondenceSep 11 2006Sep 20 2006We present a detailed discussion of AdS_3 black holes and their connection to two-dimensional conformal field theories via the AdS/CFT correspondence. Our emphasis is on deriving refined versions of black hole partition functions, that include the effect ... More
Everett's Missing Postulate and the Born RuleFeb 14 2019Feb 15 2019Everett's Relative State Interpretation (aka Many Worlds Interpretation) has gained increasing interest due to the progress understanding the role of decoherence. In order to fulfill its promise as a realistic description of the physical world, two postulates ... More
Evolution equations from an epistemic treatment of timeJan 10 2018Jan 07 2019Relativistically, time $t$ is an observable just like position $r$. In quantum theory, $t$ is a parameter, in contrast to the observable $r$. This discrepancy suggests that there exists a more elaborate formalization of time, which encapsulates both perspectives. ... More
Derivatives as an IR Regulator for Massless FieldsMar 24 1995The free propagator for the scalar $\lambda \phi^4$--theory is calculated exactly up to the second derivative of a background field. Using this propagator I compute the one--loop effective action, which then contains all powers of the field but with at ... More
Decay of correlations, Lyapunov exponents and anomalous diffusion in the Sinai billiardNov 02 1995We compute the decay of the velocity autocorrelation function, the Lyapunov exponent and the diffusion constant for the Sinai billiard within the framework of dynamical zeta functions. The asymptotic decay of the velocity autocorrelation function is found ... More
Periodic orbit asymptotics for intermittent Hamiltonian systemsJun 17 1994We address the problems in applying cycle expansions to bound chaotic systems, caused by e.g. intermittency and incompleteness of the symbolic dynamics. We discuss zeta functions associated with weighted evolution operators and in particular a one-parameter ... More
The role of singularities in chaotic spectroscopyDec 12 1996We review the status of the semiclassical trace formula with emphasis on the particular types of singularities that occur in the Gutzwiller-Voros zeta function for bound chaotic systems. To understand the problem better we extend the discussion to include ... More
LLT polynomials, elementary symmetric functions and melting lollipopsMar 10 2019We conjecture an explicit positive combinatorial formula for the expansion of unicellular LLT polynomials in the elementary symmetric basis. This is an analogue of the Stanley--Stembridge conjecture and previously studied by Panova and the author in 2018. ... More
Available energy and ground states of collisionless plasmasJun 16 2017The energy budget of a collisionless plasma subject to electrostatic fluctuations is considered, and the excess of thermal energy over the minimum accessible to it under various constraints that limit the possible forms of plasma motion is calculated. ... More
Interference Alignment (IA) and Coordinated Multi-Point (CoMP) overheads and RF impairments: testbed resultsJan 14 2014Mar 16 2014In this work we investigate the network MIMO techniques of interference alignment (IA) and fully adaptive joint transmission coordinated multipoint (CoMP) in an indoor very small cell environment. Our focus is on the overheads in a system with quantized ... More
Worldsheet two- and four-point functions at one loop in AdS(3) / CFT(2)Mar 06 2014Apr 12 2014In this note we study worldsheet two- and four-point functions at the one-loop level for the type IIA superstring in AdS(3) x S(3) x M(4) . We first address the regularization ambiguity that appears in the dispersion relation derived from integrability. ... More
Escape from intermittent repellers- Periodic orbit theory for crossover from exponential to algebraic decayMar 18 1999May 18 1999We apply periodic orbit theory to study the asymptotic distribution of escape times from an intermittent map. The dynamical zeta function exhibits a branch point which is associated with an asymptotic power law escape. By an analytic continuation technique ... More
Smart Home Wireless Sensor Nodes Addressing the Challenges using Smart Objects and Artificial IntelligenceMar 08 2019Smart homes are further development of intelligent buildings and home automation, where context awareness and autonomous behaviour are added. They are based on a combination of the Internet and emerging technologies like wireless sensor nodes. These wireless ... More
Multiphasic profiles for the biologically important ion activities of NaCl and KClDec 05 2017When plotted in linear transformations of the Michaelis-Menten equation, ion uptake in plants has been shown to be multiphasic, i.e. to be represented by a series of straight lines separated by discontinuous transitions (Nissen 1971, 1974, 1991, 1996). ... More
Quantum mechanics from an epistemic state spaceMar 24 2017Feb 25 2018We derive the Hilbert space formalism of quantum mechanics from epistemic principles. A key assumption is that a physical theory that relies on entities or distinctions that are unknowable in principle gives rise to wrong predictions. An epistemic formalism ... More
On the worldsheet theory of the type IIA AdS(4) x CP(3) superstringSep 03 2009Mar 19 2010We perform a detailed study of the type IIA superstring in AdS(4) x CP(3). After introducing suitable bosonic light-cone and fermionic kappa worldsheet gauges we derive the pure boson and fermion SU(2|2) x U(1) covariant light-cone Hamiltonian up to quartic ... More
Renormalization of Oscillator Lattices with DisorderApr 13 2009A real-space renormalization transformation is constructed for lattices of non-identical oscillators with dynamics of the general form $d\phi_{k}/dt=\omega_{k}+g\sum_{l}f_{lk}(\phi_{l},\phi_{k})$. The transformation acts on ensembles of such lattices. ... More
Polytopes and large counterexamplesSep 02 2016Sep 08 2016In this short note, we give large counterexamples to natural questions about certain order polytopes, in particular, Gelfand--Tsetlin polytopes. Several of the counterexamples are too large to be discovered via a brute-force computer search. We also show ... More
Physical properties of outflows: Comparing CO and H2O based parameters in Class 0 sourcesMar 11 2013Context. The observed physical properties of outflows from low-mass sources put constraints on possible ejection mechanisms. Historically, these quantities have been derived from CO using ground-based observations. It is thus important to investigate ... More
Estimation in Two-stage Adaptive DesignsFeb 01 2016We consider conditional estimation in two-stage sample size adjustable designs and the following bias. More specifically, we consider a design which permits raising the sample size when interim results look rather promising, and, which keeps the originally ... More
Fermionic and bosonic pair creation in an external electric field at finite temperature using the functional Schrödinger representationDec 21 1994Jan 09 1995We solve the time evolution of the density matrix both for fermions and bosons in the presence of a homogeneous but time dependent external electric field. The number of particles produced by the external field, as well as their distribution in momentum ... More
Explicit gauge invariant quantization of the Schwinger model on a circle in the functional Schrödinger representationJan 25 1996We solve the Schwinger model on a circle by first finding the explicit groundstate functional(s). Having done this, we give the structure of the Hilbert space and derive bosonization formulae in this formalism.
CP Investigations in the Higgs SectorNov 29 1995In a more general electroweak theory, there could be Higgs particles that are odd under $CP$. When such particles decay via vector bosons to two fermion-antifermion pairs, the momenta of those will be correlated in a way which is determined by the $CP$ ... More
Solution of the Boltzmann equation in a random magnetic fieldNov 04 1994A general framework for solving the Boltzmann equation for a 2-dimensional electron gas (2DEG) in random magnetic fields is presented, when the random fields are included in the driving force. The formalism is applied to some recent experiments, and a ... More
Theory of the Eigler-swithDec 02 1993We suggest a simple model to describe the reversible field-induced transfer of a single Xe-atom in a scanning tunneling microscope, --- the Eigler-switch. The inelasticly tunneling electrons give rise to fluctuating forces on and damping of the Xe-atom ... More
Angular and energy correlations in Higgs decayMar 23 1993We discuss how correlations among momenta of the decay products may yield information about the CP-parity of the Higgs particle. These are correlations of decay planes defined by the momenta of pairs of particles as well as correlations between energy ... More
Shifted symmetric functions and multirectangular coordinates of Young diagramsAug 08 2016In this paper, we study shifted Schur functions $S_\mu^\star$, as well as a new family of shifted symmetric functions $\mathfrak{K}_\mu$ linked to Kostka numbers. We prove that both are polynomials in multi-rectangular coordinates, with nonnegative coefficients ... More
New classes of bi-axially symmetric solutions to four-dimensional Vasiliev higher spin gravityOct 11 2016Nov 23 2016We present new infinite-dimensional spaces of bi-axially symmetric asymptotically anti-de Sitter solutions to four-dimensional Vasiliev higher spin gravity, obtained by modifications of the Ansatz used in arXiv:1107.1217, which gave rise to a Type-D solution ... More
Self-Interaction Correction to Black Hole RadianceAug 02 1994We consider the modification of the formulas for black hole radiation, due to the self-gravitation of the radiation. This is done by truncating the coupled particle-hole system to a small set of modes, that are plausibly the most significant ones, and ... More
QCD Interference Effects of Heavy Particles Below ThresholdJan 16 1996May 22 1996We consider how two classes of heavy particles: extra vector-like families, and strongly interacting superpartners, manifest themselves below threshold, by interference of virtual loops with normal QCD processes. Quantitative estimates are presented.
Psychological Safety and Norm Clarity in Software Engineering TeamsFeb 05 2018In the software engineering industry today, companies primarily conduct their work in teams. To increase organizational productivity, it is thus crucial to know the factors that affect team effectiveness. Two team-related concepts that have gained prominence ... More
Discerning Dark Energy Models with High-Redshift Standard CandlesJun 26 2017Following the success of type Ia supernovae in constraining cosmologies at lower redshift $(z\lesssim2)$, effort has been spent determining if a similarly useful standardisable candle can be found at higher redshift. {In this work we determine the largest ... More
Diffusion dynamics and synchronizability of hierarchical products of networksApr 10 2017Sep 25 2017The hierarchical product of networks represents a natural tool for building large networks out of two smaller subnetworks: a primary subnetwork and a secondary subnetwork. Here we study the dynamics of diffusion and synchronization processes on hierarchical ... More