Zobrazeno 1 - 10
of 203
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
Tento výsledek nelze pro nepřihlášené uživatele zobrazit.
K zobrazení výsledku je třeba se přihlásit.
K zobrazení výsledku je třeba se přihlásit.
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