9,567 research outputs found
Morris campus receives Next Generation Energy Grant
Get PDFGovernor Tim Pawlenty announced 50,000 to study the economics of businesses that store and supply biomass to energy facilities such as the one on the Morris campus
UMN Morris Receives $2 Million in Upgrades From HEAPR Funding
Get PDFThe University of Minnesota Morris received $2 million in Higher Education Asset Preservation and Replacement (HEAPR) funding as a result of the capital investment bonding bill signed last week by Governor Tim Walz. UMN Morris will utilize the funding to address utility repairs and upgrades, HVAC control upgrades, water infiltration issues and accessibility enhancements
Superluminal velocity through near-maximal neutrino oscillations or by being off shell
No full textRecently it was suggested that the observation of superluminal neutrinos by the OPERA collaboration may be due to group velocity effects resulting from close-to-maximal oscillation between neutrino mass eigenstates, in analogy to known effects in optics. We show that superluminal propagation does occur through this effect for a series of very narrow energy ranges, but this phenomenon cannot explain the OPERA measurement. Superluminal propagation can also occur if one of the neutrino masses is extremely small. However the effect only has appreciable amplitude at energies of order this mass and thus has negligible overlap with the multi-GeV scale of the experiment
Tim Grove named head women\u27s basketball coach
Get PDFAthletic Director Mark Fohl announces that Tim Grove has been named head women’s basketball coach at the University of Minnesota, Morris. Grove, who was selected following a national search, served as interim head coach for the Cougars women’s basketball team this past season
Renormalizable extra-dimensional models
No full textNon-Abelian gauge theories may have continuum limits in more than four dimensions, supported by non-trivial ultra-violet fixed points. Moreover, such theories can be expected to be accessible to Wilson's epsilon expansion. We investigate this series for SU(N) Yang-Mills, in particular for the fixed point coupling and critical exponent nu, up to four loops. From the model-building point of view, such theories would be effectively perturbatively renormalizable in the normal way. A particularly attractive possibility is the construction of renormalizable extra-dimensional models of the weak interactions, which have the potential to address the full hierarchy problem. The simplest such gauge-Higgs unification model is however ruled out by a combination of theoretical and phenomenological constraints
Large curvature and background scale independence in single-metric approximations to asymptotic safety
No full textIn single-metric approximations to the exact renormalization group (RG) for quantum gravity, it has been not been clear how to treat the large curvature domain beyond the point where the effective cutoff scale k is less than the lowest eigenvalue of the appropriate modified Laplacian. We explain why this puzzle arises from background dependence, resulting in Wilsonian RG concepts being inapplicable. We show that when properly formulated over an ensemble of backgrounds, the Wilsonian RG can be restored. This in turn implies that solutions should be smooth and well defined no matter how large the curvature is taken. Even for the standard single-metric type approximation schemes, this construction can be rigorously derived by imposing a modified Ward identity (mWI) corresponding to rescaling the background metric by a constant factor. However compatibility in this approximation requires the space-time dimension to be six. Solving the mWI and flow equation simultaneously, new variables are then derived that are independent of overall background scale
Faculty and Staff Recognition Dinner, 2009
Get PDFAward winners:
UMM Alumni Association Teaching Award: Brad Deane
Mary Martelle Memorial Award: Nathan Lael Giles and Carol McCannon
Outstanding Staff Awards: Linda Pederson, Carol McCannon, and Mark Staebler
Morris Academic Staff Award: Henry Fulds
Retirees: James Carlson, Kay Carlson, Janie Klein, Tom Mahoney, Carol McCannon, Mike Miller, Tim Ray, Judy Riley, Lynn Schulz, James Van Alstinehttps://digitalcommons.morris.umn.edu/facstaffrecognition/1003/thumbnail.jp
Redundant operators in the exact renormalisation group and in the f(R) approximation to asymptotic safety
No full textIn this paper we review the definition and properties of redundant operators in the exact renormalisation group. We explain why it is important to require them to be eigenoperators and why generically they appear only as a consequence of symmetries of the particular choice of renormalisation group equations. This clarifies when Newton’s constant and or the cosmological constant can be considered inessential. We then apply these ideas to the Local Potential Approximation and approximations of a similar spirit such as the f (R) approximation in the asymptotic safety programme in quantum gravity. We show that these approximations can break down if the fixed point does not support a ‘vacuum’ solution in the appropriate domain: all eigenoperators become redundant and the physical space of perturbations collapses to a point. We show that this is the case for the recently discovered lines of fixed points in the f (R) flow equations
The Art of Aftermath: Words and Pictures Exchanged between 07/2020 – 03 /2023
No full textIn the summer 2020, the American artist Tim Maul and the Irish author Catherine Morris agreed to develop a writing project around a set of 35 mm slides he had gifted her from his 1994 commission with the National Library of Ireland. The result is an attempt at an image/writing exchange outside of the positivist “creative” busywork that appeared early in the ongoing pandemi
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