Zobrazeno 1 - 10
of 227
pro vyhledávání: '"Van Raamsdonk, Mark"'
Autor:
Van Raamsdonk, Mark, Zibakhsh, Rana
We investigate the effect on cosmological evolution of a strongly coupled quantum field that undergoes renormalization group flow from a UV CFT to an IR CFT. The field theory is defined by perturbation of a holographic CFT by a relevant operator asso
Externí odkaz:
http://arxiv.org/abs/2409.03914
Autor:
Van Raamsdonk, Mark, Waddell, Chris
Negative lambda gravitational effective field theories dual to holographic CFTs have potentially realistic cosmological solutions. Generic cosmological solutions of these effective field theories have scalar field evolution that can lead to a period
Externí odkaz:
http://arxiv.org/abs/2406.02688
Autor:
Jarov, Seraphim, Van Raamsdonk, Mark
For a quantum system with Hilbert space ${\cal H}$ of dimension $N$ and a set $S$ of $n$ Hermitian operators ${\cal O}_i$, a basic question is to understand the set $E_S \subset \mathbb{R}^n$ of points $\vec{e}$ where $e_i = {\rm tr}(\rho {\cal O}_i)
Externí odkaz:
http://arxiv.org/abs/2310.13111
Gravitational effective theories associated with holographic CFTs have cosmological solutions, which are typically big-bang / big-crunch cosmologies. These solutions are not asymptotically AdS, so they are not dual to finite-energy states of the CFT.
Externí odkaz:
http://arxiv.org/abs/2306.13143
Autor:
Van Raamsdonk, Mark, Waddell, Chris
The potential energy from a time-dependent scalar field provides a possible explanation for the observed cosmic acceleration. In this paper, we investigate how data from supernova and bary acoustic oscillation surveys constrain the possible evolution
Externí odkaz:
http://arxiv.org/abs/2305.04946
Autor:
Swingle, Brian, Van Raamsdonk, Mark
Motivated by traversable wormhole constructions that require large amounts of negative energy, we explore constraints on the amount of negative energy that can be carried by a free Dirac field in a slab-shaped region between two parallel spatial plan
Externí odkaz:
http://arxiv.org/abs/2212.02609
A large class of $\Lambda < 0$ cosmologies have big-bang / big crunch spacetimes with time-symmetric backgrounds and asymptotically AdS Euclidean continuations suggesting a possible holographic realization. We argue that these models generically have
Externí odkaz:
http://arxiv.org/abs/2212.00050
Autor:
Van Raamsdonk, Mark
Time-dependent scalar fields provide a candidate explanation for the dark energy. For these to vary on cosmological time scales, the derivative of the scalar potential in Planck units should have roughly the same magnitude as the potential itself. We
Externí odkaz:
http://arxiv.org/abs/2211.12611
A large class of flat big bang - big crunch cosmologies with negative cosmological constant are related by analytic continuation to asymptotically AdS traversable wormholes with planar cross section. In recent works (arXiv: 2102.05057, 2203.11220) it
Externí odkaz:
http://arxiv.org/abs/2207.02225
Publikováno v:
Phys. Rev. Lett. 130, 221601 (2023)
We consider cosmological models in which the cosmology is related via analytic continuation to a Euclidean asymptotically AdS planar wormhole geometry defined holographically via a pair of three-dimensional Euclidean CFTs. We argue that these models
Externí odkaz:
http://arxiv.org/abs/2206.14821