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  • 1
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    Phase structure of spin-imbalanced unitary Fermi gases (2015)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2015-01-13
    Beschreibung: Author(s): I. Boettcher, J. Braun, T. K. Herbst, J. M. Pawlowski, D. Roscher, and C. Wetterich We investigate the phase structure of spin-imbalanced unitary Fermi gases beyond mean-field theory by means of the functional renormalization group. In this approach, quantum and thermal fluctuations are resolved in a systematic manner. The discretization of the effective potential on a grid allows ... [Phys. Rev. A 91, 013610] Published Mon Jan 12, 2015
    Schlagwort(e): Matter waves and collective properties of cold atoms and molecules
    Print ISSN: 1050-2947
    Digitale ISSN: 1094-1622
    Thema: Physik
    Publiziert von American Physical Society (APS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    Cosmic fluctuations from a quantum effective action (2015)
    American Physical Society (APS)
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    Publikationsdatum: 2015-10-07
    Beschreibung: Author(s): C. Wetterich Does the observable spectrum of cosmic fluctuations depend on detailed initial conditions? This addresses the question if the general inflationary paradigm is sufficient to predict within a given model the spectrum and amplitude of cosmic fluctuations, or if additional particular assumptions about t… [Phys. Rev. D 92, 083507] Published Tue Oct 06, 2015
    Schlagwort(e): Cosmology
    Print ISSN: 0556-2821
    Digitale ISSN: 1089-4918
    Thema: Physik
    Publiziert von American Physical Society (APS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    Lattice diffeomorphism invariance (2012)
    American Physical Society (APS)
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    Publikationsdatum: 2012-05-10
    Beschreibung: Author(s): C. Wetterich We propose a lattice counterpart of diffeomorphism symmetry in the continuum. A functional integral for quantum gravity is regularized on a discrete set of space-time points, with fermionic or bosonic lattice fields. When the space-time points are positioned as discrete points of a continuous manifo... [Phys. Rev. D 85, 104017] Published Wed May 09, 2012
    Schlagwort(e): General relativity, gravitation
    Print ISSN: 0556-2821
    Digitale ISSN: 1089-4918
    Thema: Physik
    Publiziert von American Physical Society (APS)
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  • 4
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    Coupled dark energy and dark matter from dilatation anomaly (2011)
    American Physical Society (APS)
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    Publikationsdatum: 2011-07-23
    Beschreibung: Author(s): J. Beyer, S. Nurmi, and C. Wetterich Cosmological runaway solutions may exhibit an exact dilatation symmetry in the asymptotic limit of infinite time. In this limit, the massless dilaton or cosmon could be accompanied by another massless scalar field—the bolon. At finite time, small time-dependent masses for both the cosmon and the bol... [Phys. Rev. D 84, 023010] Published Fri Jul 22, 2011
    Schlagwort(e): Astrophysics & Cosmology
    Print ISSN: 0556-2821
    Digitale ISSN: 1089-4918
    Thema: Physik
    Publiziert von American Physical Society (APS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
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    Functional renormalization for spontaneous symmetry breaking in the Hubbard model (2011)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2011-04-30
    Beschreibung: Author(s): S. Friederich, H. C. Krahl, and C. Wetterich The phases with spontaneously broken symmetries corresponding to antiferromagnetic and d-wave superconducting order in the two-dimensional t-t^{'} -Hubbard model are investigated by means of the functional renormalization group. The introduction of composite boson fields in the magnetic, charge dens... [Phys. Rev. B 83, 155125] Published Fri Apr 29, 2011
    Schlagwort(e): Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Digitale ISSN: 1095-3795
    Thema: Physik
    Publiziert von American Physical Society (APS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
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    Quantum phase transition in Bose-Fermi mixtures (2011)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2011-09-24
    Beschreibung: Author(s): D. Ludwig, S. Floerchinger, S. Moroz, and C. Wetterich We study a quantum Bose-Fermi mixture near a broad Feshbach resonance at zero temperature. Within a quantum field theoretical model, a two-step Gaussian approximation allows us to capture the main features of the quantum phase diagram. We show that a repulsive boson-boson interaction is necessary fo... [Phys. Rev. A 84, 033629] Published Fri Sep 23, 2011
    Schlagwort(e): Matter waves and collective properties of cold atoms and molecules
    Print ISSN: 1050-2947
    Digitale ISSN: 1094-1622
    Thema: Physik
    Publiziert von American Physical Society (APS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
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    Eternal Universe (2014)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2014-08-19
    Beschreibung: Author(s): C. Wetterich We discuss cosmological models for an eternal Universe. Physical observables show no singularity from the infinite past to the infinite future. While the Universe is evolving, there is no beginning and no end—the Universe exists forever. The early state of inflation is described in two different, bu... [Phys. Rev. D 90, 043520] Published Mon Aug 18, 2014
    Schlagwort(e): Cosmology
    Print ISSN: 0556-2821
    Digitale ISSN: 1089-4918
    Thema: Physik
    Publiziert von American Physical Society (APS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
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    Infrared limit of quantum gravity (2018)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2018-07-26
    Beschreibung: Author(s): C. Wetterich We explore the infrared limit of quantum gravity in the presence of a cosmological constant or effective potential for scalar fields. For a positive effective scalar potential, one-loop perturbation theory around flat space is divergent due to an instability of the graviton propagator. Functional re... [Phys. Rev. D 98, 026028] Published Wed Jul 25, 2018
    Schlagwort(e): String theory, quantum gravity, gauge/gravity duality
    Print ISSN: 0556-2821
    Digitale ISSN: 1089-4918
    Thema: Physik
    Publiziert von American Physical Society (APS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
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    Variable gravity Universe (2014)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2014-01-07
    Beschreibung: Author(s): C. Wetterich For variable gravity models the strength of gravity, as measured by Newton’s “constant” or the Planck mass, depends on the value of a scalar field, the cosmon. We discuss two simple four-parameter models with a quadratic or constant cosmon potential. They are compatible with all presently available ... [Phys. Rev. D 89, 024005] Published Mon Jan 06, 2014
    Schlagwort(e): General Relativity and Gravitation
    Print ISSN: 0556-2821
    Digitale ISSN: 1089-4918
    Thema: Physik
    Publiziert von American Physical Society (APS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
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    Quantum correlations for the metric (2017)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2017-06-21
    Beschreibung: Author(s): C. Wetterich We discuss the correlation function for the metric for homogeneous and isotropic cosmologies. The exact propagator equation determines the correlation function as the inverse of the second functional derivative of the quantum effective action. This formulation relates the metric correlation function… [Phys. Rev. D 95, 123525] Published Tue Jun 20, 2017
    Schlagwort(e): Cosmology
    Print ISSN: 0556-2821
    Digitale ISSN: 1089-4918
    Thema: Physik
    Publiziert von American Physical Society (APS)
    Standort Signatur Erwartet Verfügbarkeit
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