Fri - 01/23/26

There is no new related paper today

There is no new related paper today

  1. [] - Title: Exactly Solvable 1+1d Chiral Lattice Gauge Theories - Sahand Seifnashri

Thu - 01/22/26

**Title:

      Quantum Backreaction in Effective Brans-Dicke Bianchi I Cosmology**  - **Authors:** Hector Hugo Hernandez Hernandez, Gustavo Alejandro Sanchez Herrera  - **Subjects:** Subjects: General Relativity and Quantum Cosmology (gr-qc)  - **Arxiv link:** [https://arxiv.org/abs/](https://arxiv.org/abs/)  - **Abstract**  We investigate the effective quantum evolution of the Bianchi type I cosmological model within the Brans-Dicke framework using an effective Hamiltonian approach that includes expectation values, quantum dispersions and cross-correlation terms between different degrees of freedom. For the case $\omega < -3/2$, where energy conditions are violated and bouncing solutions exist classically, we demonstrate that quantum backreaction effects significantly smooth the bounce of directional scale factors, with the bounce occurring at scales set by the quantum state width. For the conformally invariant case $\omega = -3/2$, quantum corrections cause scale factors to enter accelerated expansion phases more rapidly than in the classical limit. Most significantly, we show that cross-correlation terms between canonical variables are essential for obtaining physically consistent effective dynamics: neglecting these terms leads to spurious divergences and unphysical behavior. When correlations are included, small-amplitude oscillations appear shortly after the bounce, rapidly damping to classical trajectories. We interpret these oscillations as quantum remnant effects encoding information about correlations between gravitational and scalar field degrees of freedom. Our results demonstrate that cross-correlations carry crucial quantum information that substantially influences cosmological dynamics, with implications for quantum gravity phenomenology near singularities. We compare our findings with existing loop quantum cosmology results.

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Wed - 01/21/26

There is no new related paper today

There is no new related paper today

  1. [] - Title: What is a Gravitational Path Integral? {\it or} Gravitational Path Integrals as Fluctuating Gravito-Hydrodynamics - T. Banks

Tue - 01/20/26

There is no new related paper today

There is no new related paper today

  1. [] - Title: What is a Gravitational Path Integral? {\it or} Gravitational Path Integrals as Fluctuating Gravito-Hydrodynamics - T. Banks

Mon - 01/19/26

There is no new related paper today

There is no new related paper today

  1. [] - Title: Lorentzian Path Integrals and Jackiw-Teitelboim wormholes with imaginary scalars - Jesse Held, Molly Kaplan, Donald Marolf, Zhencheng Wang

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