Zobrazeno 1 - 10
of 198
pro vyhledávání: '"Niedermaier M"'
Autor:
Banerjee, R., Niedermaier, M.
Publikováno v:
J. Math. Phys. 61 (2020) 103511
States of Low Energy (SLE) are exact Hadamard states defined on arbitrary Friedmann-Lema\^{i}tre spacetimes. They are constructed from a fiducial state by minimizing the Hamiltonian's expectation value after averaging with a temporal window function.
Externí odkaz:
http://arxiv.org/abs/2006.08685
Autor:
Duncan, A., Niedermaier, M.
We reexamine the Parisi-Klauder conjecture for complex e^{i\theta/2} \phi^4 measures with a Wick rotation angle 0 <= \theta/2 < \pi/2 interpolating between Euclidean and Lorentzian signature. Our main result is that the asymptotics for short stochast
Externí odkaz:
http://arxiv.org/abs/1205.0307
Akademický článek
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Publikováno v:
Nucl.Phys.B791:193-230,2008
Noncompact SO(1,N) sigma-models are studied in terms of their large N expansion in a lattice formulation in dimensions d \geq 2. Explicit results for the spin and current two-point functions as well as for the Binder cumulant are presented to next to
Externí odkaz:
http://arxiv.org/abs/0706.2929
Autor:
Niedermaier, M.
Publikováno v:
Class.Quant.Grav.24:R171-230,2007
The asymptotic safety scenario in quantum gravity is reviewed, according to which a renormalizable quantum theory of the gravitational field is feasible which reconciles asymptotically safe couplings with unitarity. All presently known evidence is su
Externí odkaz:
http://arxiv.org/abs/gr-qc/0610018
Autor:
Niedermaier, M., Seiler, E.
Publikováno v:
Commun.Math.Phys.270:373-443,2007
We investigate classical spin systems in $d\geq 1$ dimensions whose transfer operator commutes with the action of a nonamenable unitary representation of a symmetry group, here ${\rm SO}(1,N)$; these systems may alternatively be interpreted as system
Externí odkaz:
http://arxiv.org/abs/math-ph/0601049
Publikováno v:
Nucl.Phys.B720:235-288,2005; Erratum-ibid.B758:330-331,2006
We present a detailed study of quantized noncompact, nonlinear SO(1,N) sigma-models in arbitrary space-time dimensions D \geq 2, with the focus on issues of spontaneous symmetry breaking of boost and rotation elements of the symmetry group. The model
Externí odkaz:
http://arxiv.org/abs/hep-th/0405163
Autor:
Niedermaier, M.
Publikováno v:
Nucl.Phys. B673 (2003) 131-169
4D Einstein gravity coupled to scalars and abelian gauge fields in its 2-Killing vector reduction is shown to be quasi-renormalizable to all loop orders at the expense of introducing infinitely many essential couplings. The latter can be combined int
Externí odkaz:
http://arxiv.org/abs/hep-th/0304117
Autor:
Niedermaier, M.
Publikováno v:
JHEP 0212:066,2002
A perturbative quantum theory of the 2-Killing vector reduction of general relativity is constructed. Although non-renormalizable in the standard sense, we show that to all orders of the loop expansion strict cut-off independence can be achieved in a
Externí odkaz:
http://arxiv.org/abs/hep-th/0207143
Autor:
Forgacs, P., Niedermaier, M.
A perturbative quantum theory of the two Killing vector reduction of Einstein gravity is constructed. Although the reduced theory inherits from the full one the lack of standard perturbative renormalizability, we show that strict cutoff independence
Externí odkaz:
http://arxiv.org/abs/hep-th/0207028