We extend a 2d topological gravity model of marolf and maxfieldto have as its bulk action any open/closed topological quantum field theory (tqft) obeying atiyah s axioms.
The gravity model is then holographically dual to an ensemble of boundary conditions in an open/closed tqft without gravity.
Erik Verlinde's theory of entropic gravity [arXiv:1001.0785], postulating
that gravity is not a fundamental force but rather emerges thermodynamically,
has garnered much attention as a possible resolu
Hypergraphs that can depict interactions beyond pairwise edges have emerged
as an appropriate representation for modeling polyadic relations in complex
systems. With the recent surge of interest in re
The identification of important nodes in complex networks is an area of
exciting growth due to its applications across various disciplines like disease
controlling, community finding, data mining, net
Lorentz violation modifies the dispersion relation of gravitational waves
(GWs), and induces birefringence and anisotropy in propagation. Our study shows
that Lorentz violation can also activate multi
The movements of individuals within and among cities influence critical
aspects of our society, such as well-being, the spreading of epidemics, and the
quality of the environment. When information abo
We test the recently introduced radiation model against the gravity model for
the system composed of England and Wales, both for commuting patterns and for
public transportation flows. The analysis is
We explore a new horizon of modified gravity from the viewpoint of the
particle physics. As a concrete example, we take the $F(R)$ gravity to raise a
question: can a scalar particle ("scalaron") deriv
We continue the investigation of the nonlocal de sitter model of gravity, focusing on finding an appropriate solution for the schwarzschild-de sitter metric.
We succeeded to solve the equations of motion in a certain approximate approximation.
The gravitational potential of a gas of initially randomly distributed
primordial black holes (PBH) can induce a stochastic gravitational-wave (GW)
background through second-order gravitational effect
Neutron stars (NSs) are thought to be excellent laboratories for determining
the equation of state (EoS) of cold dense matter. Their strong gravity suggests
that they can also be used to constrain gra
The mass of the graviton, if nonzero, is usually considered to be very small,
e.g. of the Hubble scale, from several observational constraints. In this
paper, we propose a gravity model where the grav
Taiji-1 is the first technology demonstration satellite of the Taiji program
of China's space-borne gravitational wave antenna. After the demonstration of
the key individual technologies, Taiji-1 cont
Scalar fields coupled to gravity through the Ricci scalar have been
considered both as dark matter candidates and as a possible modified gravity
explanation for galactic dynamics. It has recently been
We consider some background tests of standard cosmology in the context of
Horava gravity with different scaling dimensions for space and time, which has
been proposed as a renormalizable, higher-deriv
Optimal transport has become part of the standard quantitative economics
toolbox. It is the framework of choice to describe models of matching with
transfers, but beyond that, it allows to: extend qua
We investigate the possibility of dark matter being a pure geometrical
effect, rather than a particle or a compact object, by exploring a specific
modified gravity model: mimetic dark matter. We prese
We discuss boson stars and neutron stars, respectively, in a scalar-tensor
gravity model with an explicitly time-dependent real scalar field. While the
boson stars in our model -- in contrast to the n