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XXXV International Workshop on High Energy Physics "From Quarks to Galaxies: Elucidating Dark Sides"

28 ноября 2023 г. to 1 декабря 2023 г.
Europe/Moscow timezone

Contacts

Сессия

Afternoon session 30/11/2023

7
30 нояб. 2023 г., 14:30

Описание

Gravitation & Cosmology: gravity, dark matter

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  1. 42. Nonlocal gravity. Several aspects
    Проф. Nikolay Krasnikov (Institute for Nuclear Research RAS, Moscow)
    30.11.2023, 14:30
    Gravitation & Cosmology

    I review several aspects of nonlocal field theory and nonlocal quantum gravity

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  2. 43. Conformal scalar and spinor fields in curved space
    Проф. Mohamed Arbab (Qassim University and Khartoum University)
    30.11.2023, 15:15
    Gravitation & Cosmology

    These fields scale as, $\tilde\phi (\psi)=\Omega^\xi\,\phi(\psi)$ and the metric tensor as $\tilde{g}_{\mu\nu}=\Omega^2\,g_{\mu\nu}$, where $\Omega$ and $\xi$ are called the conformal factor and wight, respectively. The conformal mass in Klein-Gordon mass ($\tilde m$) is related to original scalar mass, ($m$) by $\tilde{m}=\Omega^{-1}\,m$\,. Moreover, the Klein-Gordon equation in the...

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  3. 6. Spherically symmetric loop quantum gravity
    Проф. Jorge Pullin (Louisiana State University)
    30.11.2023, 15:50
    Gravitation & Cosmology

    We summarize results on spherically symmetric loop quantum gravity, including singularity elimination, Hawking radiation and the Casimir effect.

    Information on the subject:

    1. R Gambini, J. Olmedo, JP, CQG 31 095009 (2014) arXiv:1310.5996
    2. Bambi, Modesto, Shapiro ”Handbook of Quantum Gravity” (2023)
      [gr-qc] 2211.05621
    3. R. Gambini, JP, Class.Quant.Grav. 31 (2014) 115003; 1312.3595...
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  4. 45. Black Dark Matter and Antimatter
    Проф. Alexander Dolgov (Novosibirsk State University & JINR, Dubna)
    30.11.2023, 16:40
    Gravitation & Cosmology

    It is shown that the dense population of the early universe with well developed galaxies and supermassive black holes (quasars), observed by HST and JWST, nicely fits the conjecture that the galaxies and quasars are seeded by primordial black holes (PBHs), proposed in our work more than 30 years ago. This idea of galaxy seeding by massive black holes is rediscovered in recent publications by...

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  5. 1. Normalization of the vacuum and the ultraviolet completion of Einstein gravity
    Проф. Philip Mannheim (Department of Physics, University of Connecticut, Storrs)
    30.11.2023, 17:25
    Gravitation & Cosmology

    Second-order-derivative plus fourth-order-derivative gravity is the ultraviolet completion of second-order-derivative quantum Einstein gravity. While it achieves renormalizability through states of negative Dirac norm, the unitarity violation that this would entail can be postponed to Planck energies. As we show in this paper the theory has a different problem, one that occurs at all energy...

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  6. 46. Quantum Conformality or Asymptotic Safety in Higher Derivative Gravitational Theories
    Проф. Leslaw Rachwal (Departamento de Física-Instituto de Ciências Exatas, Universidade Federal de Juiz de Fora, Juiz de Fora)
    30.11.2023, 18:10
    Gravitation & Cosmology

    We present and discuss well known conditions for ultraviolet finiteness and asymptotic safety. The requirements for complete absence of ultraviolet divergences in quantum field theories and existence of a non-trivial fixed point for renormalization group flow in the ultraviolet regime are compared based on the example of a six-derivative quantum gravitational theory in d=4 spacetime...

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  7. 47. General discussion - 4
    30.11.2023, 18:55
    Gravitation & Cosmology

    Discussion leader
    Vladimir Soloviev (NRC KI - Logunov IHEP)

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