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The Dark Side of the Universe DSU2022

5–9 Dec 2022
Australia/Sydney timezone

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Session

Gravity - Dark Energy

8 Dec 2022, 14:00
149 (Old Main Building)

149

Old Main Building

Conveners

Gravity - Dark Energy

  • Shinji Mukohyama

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There are no materials yet.

  1. 119. Fixing cosmological constant on the event horizon
    Prof. Merab Gogberashvili (Javakhishvili State University)
    08/12/2022, 14:00
    Dark energy

    Standard cosmological equations are written for the Hubble volume, while the real boundary of space-time is the event horizon. Within the thermodynamic approach to gravity, the dark energy term in cosmological equations appears as an integration constant, which we fix at the event horizon and obtain the observed value for the cosmological constant.

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  2. 20. Probing interacting Dark Energy models and scattering of baryons with Dark Matter in the light of 21cm signal
    upala mukherjee (Saha Institute of Nuclear Physics)
    08/12/2022, 14:20
    Dark energy

    The EDGES experiment has observed an excess trough in the brightness temperature of the 21cm absorption line of neutral Hydrogen atom (HI) from the era of cosmic dawn. We consider possible interaction of Dark Matter and Dark Energy fluid along with the cooling off of the baryon matter by its collision with Dark Matter to explain the EDGES like excess absorption feature of the 21cm signal. We...

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  3. 31. Hunting Dark Energy on astrophysical scales
    Leonardo Giani
    08/12/2022, 14:40
    Dark energy

    State-of-the-art observations tightly constrain the properties of Dark Energy on Cosmological scales, where its behaviour is very close to the one of a cosmological constant. Whilst several Dark Energy candidates are capable of mimicking such a behaviour within the experiments' precision, they may be very distinguishable on smaller astrophysical scales. A rather common feature is that they...

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  4. 4. Holography for extended theories of gravity
    Masoud Ghezelbash
    08/12/2022, 15:00
    Gravity and gravitational waves

    The nonextremal Kerr black holes have been considered to be holographically dual to two- dimensional (2D) conformal field theories (CFTs). In this talk, we present the holography for the asymptotically anti-de Sitter (AdS) rotating charged black holes in extended theories of gravity. We find that the scalar wave radial equation at the near-horizon region implies the existence of the 2D...

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  5. 7. Matter Bounce Scenario in Extended Symmetric Teleparallel Gravity
    Mr Amarkumar Agrawal (BITS-Pilani, Hyderabad Campus, India.)
    08/12/2022, 15:20
    Gravity and gravitational waves

    In this paper, we have shown the matter bounce scenario of the Universe in an extended symmetric teleparallel gravity, the $f(Q)$ gravity. Motivated by the bouncing scenario and loop quantum cosmology (LQC), the form of the function $f(Q)$ has been obtained at the backdrop of Friedmann-Lema$\hat{i}$tre-Robertson Walker (FLRW) space-time. Considering the background cosmology dominated by dust...

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