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19912026
Showing 2016 · hep-thShow all

28 papers · 2 filters

hep-th2016★ 56 cited

How Gaussian can our Universe be?

Giovanni Cabass, Enrico Pajer, Fabian Schmidt

Gravity is a non-linear theory, and hence, barring cancellations, the initial super-horizon perturbations produced by inflation must contain some minimum amount of mode coupling, o…

hep-th2016★ 41 cited

Holographic Thermalization and Generalized Vaidya-AdS Solutions in Massive Gravity

Ya-Peng Hu, Xiao-Xiong Zeng, Hai-Qing Zhang

We investigate the effect of massive graviton on the holographic thermalization process. Before doing this, we first find out the generalized Vaidya-AdS solutions in the de Rham-Ga…

hep-th2016★ 10 cited

Matrix Quantum Mechanics on

Panagiotis Betzios, Umut Gürsoy, Olga Papadoulaki

We study Matrix Quantum Mechanics on the Euclidean time orbifold . Upon Wick rotation to Lorentzian time and taking the double-scaling limit this theory provides…

hep-th2016★ 59 cited

Inverse Magnetic Catalysis from improved Holographic QCD in the Veneziano limit

Umut Gürsoy, Ioannis Iatrakis, Matti Järvinen +1

We study the dependence of the chiral condensate on external magnetic field in the context of holographic QCD at large number of flavors. We consider a holographic QCD model where…

hep-th2016★ 30 cited

Correlation functions in theories with Lifshitz scaling

Ville Keranen, Watse Sybesma, Phillip Szepietowski +1

The 2+1 dimensional quantum Lifshitz model can be generalised to a class of higher dimensional free field theories that exhibit Lifshitz scaling. When the dynamical critical expone…

hep-th2016★ 31 cited

Higgs-otic Inflation and Moduli Stabilization

Sjoerd Bielleman, Luis E. Ibanez, Francisco G. Pedro +2

We study closed-string moduli stabilization in Higgs-otic inflation in Type IIB orientifold backgrounds with fluxes. In this setup large-field inflation is driven by the vacuum ene…

hep-th2016★ 33 cited

Exceptional theories

Iñaki García-Etxebarria, Diego Regalado

We present a new construction of four dimensional theories, given by M5 branes wrapping a in an M-theory U-fold background. The resulting setup generalizes the…

hep-th2016★ 17 cited

Siegel Modular Forms and Black Hole Entropy

Alexandre Belin, Alejandra Castro, Joao Gomes +1

We discuss the application of Siegel Modular Forms to Black Hole entropy counting. The role of the Igusa cusp form in the D1D5P system is well-known, and its transformatio…

hep-th2016★ 14 cited

Supersymmetric Casimir Energy and Transformations

Frederic Brünner, Diego Regalado, Vyacheslav P. Spiridonov

We provide a recipe to extract the supersymmetric Casimir energy of theories defined on primary Hopf surfaces directly from the superconformal index. It involves an $\mathrm{SL(3,\…

hep-th2016★ 80 cited

Backreaction Issues in Axion Monodromy and Minkowski 4-forms

Irene Valenzuela

We clarify the differences between the usual Kaloper-Sorbo description of axion monodromy and the effective axionic potential in terms of Minkowski 4-forms derived in string compac…

hep-th2016★ 56 cited

The Conformal Limit of Inflation in the Era of CMB Polarimetry

Enrico Pajer, Guilherme L. Pimentel, Jaap V. S. Van Wijck

We argue that the non-detection of primordial tensor modes has taught us a great deal about the primordial universe. In single-field slow-roll inflation, the current upper bound on…

hep-th2016★ 50 cited

Construction of all N=4 conformal supergravities

Daniel Butter, Franz Ciceri, Bernard de Wit +1

All N=4 conformal supergravities in four space-time dimensions are constructed. These are the only N=4 supergravity theories whose actions are invariant under off-shell supersymmet…

hep-th2016★ 65 cited

The Black Hole S-Matrix from Quantum Mechanics

Panagiotis Betzios, Nava Gaddam, Olga Papadoulaki

We revisit the old black hole S-Matrix construction and its new partial wave expansion of 't Hooft. Inspired by old ideas from non-critical string theory & Matrix Quantum Mec…

hep-th2016★ 9 cited

Shift-symmetries and gauge coupling functions in orientifolds and F-theory

Pierre Corvilain, Thomas W. Grimm, Diego Regalado

We investigate the field dependence of the gauge coupling functions of four-dimensional Type IIB orientifold and F-theory compactifications with space-time filling seven-branes. In…

hep-th2016★ 14 cited

The role of conformal symmetry in gravity and the standard model

Stefano Lucat, Tomislav Prokopec

In this paper we consider conformal symmetry in the context of manifolds with general affine connection. We extend the conformal transformation law of the metric to a general metri…

hep-th2016★ 9 cited

Holographic equilibration in confining gauge theories under external magnetic fields

Tuna Demircik, Umut Gursoy

We investigate the effect of external magnetic fields on equilibration in the improved holographic QCD theory in the deconfined phase using the AdS/CFT correspondence. In particula…

hep-th2016

Nature's Book Keeping System

Gerard t Hooft

Establishing how one should describe and study natures fundamental degrees of freedom is a notoriously difficult problem. It is tempting to assume that the number of bits (or qubit…

hep-th2016★ 19 cited

Reflections on the renormalization procedure for gauge theories

Gerard t Hooft

Various pieces of insight were needed to formulate the rules for working with gauge theories of the electro-magnetic, weak and strong forces. First, it was needed to understand how…

hep-th2016★ 8 cited

Computing black hole partition functions from quasinormal modes

Peter Arnold, Phillip Szepietowski, Diana Vaman

We propose a method of computing one-loop determinants in black hole spacetimes (with emphasis on asymptotically anti-de Sitter black holes) that may be used for numerics when comp…

hep-th2016★ 10 cited

Black hole collapse and democratic models

Aron Jansen, Javier M. Magan

We study the evolution of black hole entropy and temperature in collapse scenarios, finding three generic lessons. First, entropy evolution is extensive. Second, at large times, en…

hep-th2016★ 4 cited

A magnetically induced quantum phase transition in holography

A. Gnecchi, U. Gursoy, O. Papadoulaki +1

We investigate quantum phase transitions in a 2+1 dimensional gauge theory at finite chemical potential and magnetic field . The gravity dual is based on 4D …

hep-th2016★ 9 cited

Bound states of spinning black holes in five dimensions

P. Marcos Crichigno, Flavio Porri, Stefan Vandoren

We find and study supergravity BPS bound states of five-dimensional spinning black holes in asymptotically flat spacetime. These solutions follow from multi-string solutions in six…

hep-th2016★ 44 cited

A new dynamical instability in Anti-de-Sitter spacetime

Umut Gürsoy, Aron Jansen, Wilke van der Schee

We present fully dynamical solutions to Einstein-scalar theory in asymptotically Anti-de-Sitter spacetime with a scalar potential containing particularly rich physics. Depending on…

hep-th2016★ 2 cited

Elliptic genera from multi-centers

Nava Gaddam

I show how elliptic genera for various Calabi-Yau threefolds may be understood from supergravity localization using the quantization of the phase space of certain multi-center conf…