We want to answer following long standing questions of AdS/CMT. 1. Where is the large N. 2. How to encode the lattice information? 3. The appearance of Strange metal in strongly coupled system.
This presentation introduces a new project aimed at detecting dark matter at the Yemi Microgravity Observatory, called D-μGICK. Located 1,008 meters underground (118 meters below sea level) in the Yemi Lab in Jeongseon, Gangwon Province, this project uses a superconducting gravimeter to explore the possible existence of Compact Dark Objects (CDOs) within the Earth. To enhance the efficiency of...
Black holes are some of the most interesting objects in astrophysics. Light, gravitational waves, and massive particles emitted or passing in their close vicinity are gravitationally lensed and provide a unique probe of gravity in the strong field regime. On one hand this allows to test different black hole models from general relativity or alternative theories of gravity, and on the other...
In this talk I will review the construction of the three dimensional "accelerating BTZ" black hole solution and contrast this with the well known "C-metric" in four spacetime dimensions. I will then discuss how the presence of acceleration affects the variational problem, thermodynamic aspects and holographic interpretation via AdS/CFT. This talk is based on ongoing work with Euihun Joung,...
We consider how to find exact solutions for rotating black holes in a four-dimensional Lorentz violating gravity and its interesting physical properties which are quite different from the Kerr solution in GR.
In this work, we consider the low-energy sector of Horava gravity in four dimensions and find the exact rotating black hole solutions (with or without cosmological constant). The rotating black hole solutions are charged only when we consider the noble electromagnetic couplings, in such a way that the speed of light is the same as the speed of gravity.
We propose to solve the dark energy and the coincidence problems by postulating the massless sector of closed strings. This sector constitutes the gravitational multiplet of string theory and, when applied to four-dimensional cosmology, predicts that the expansion of an open Universe defined in string frame is readily accelerating. We confront the prediction with the late-time cosmological...
We investigate the homogeneous and anisotropic evolution of spacetime driven by perfect fluid with shear viscosity. We consider the simplest form of the equation of state wherein the pressure and the shear stress are proportional to the energy density individually. We consider single off-diagonal component of shear viscosity, and find that the evolution of spacetime becomes Bianchi type-I. A...
I will talk about 3-sphere partition functions of various 3d N = 2 holographic SCFTs arising from the N stack of M2-branes in the ’t Hooft limit. I will first explain how to evaluate the free energy F = −log Z analytically at the planar level via saddle point approximation, tracking the first subleading corrections in the large ’t Hooft coupling λ expansion. Subsequently, I present the...
A model of supergravity inflation we recently proposed can produce slow roll inflation and a realistic spectrum of particles even without F-term supersymmetry breaking. Supersymmetry is broken only by a D-term induced by a recently discovered new type of Fayet Iliopoulos (FI) term. Almost all supersymmetric partners of the standard model fields can get masses as high as the inflationary Hubble...
We demonstrate how the ultralight dark matter (ULDM) model can resolve the final parsec problem of supermassive black holes. Following this, we derive the characteristic scales for physical quantities observed in galaxies, including mass, size, acceleration, and angular momentum, within the framework of the ULDM model, both with and without self-interaction. Additionally, we discuss the...
Background electromagnetic fields modify the Maxwell theory into nonlinear electrodynamics. Highly magnetized neutron stars and cosmic magnetic fields in the early universe receive QED loop corrections. Photons have multi-refringence and the polarization vectors carry information about the electromagnetic fields. The Maxwell theory in curved spacetimes, such as black holes and early universe,...
