Shenker, Stephen Hart 1953
Overview
Works:  13 works in 14 publications in 1 language and 16 library holdings 

Roles:  Thesis advisor, Author 
Publication Timeline
.
Most widely held works by
Stephen Hart Shenker
Topics in lattice gauge theories and spin systems by
Stephen Hart Shenker(
)
2 editions published in 1980 in English and held by 4 WorldCat member libraries worldwide
2 editions published in 1980 in English and held by 4 WorldCat member libraries worldwide
Towards a string theory model of de Sitter space and early universe cosmology by Jonathan David Maltz(
)
1 edition published in 2013 in English and held by 1 WorldCat member library worldwide
String theory is arguably the best candidate for a theory of quantum gravity and unified interactions. Reconciling Einstein's theory of General Relativity with Quantum Mechanics. The theory however is best understood on Minkowski and Antide Sitter spacetimes, and not on exponentially expanding spacetimes with positive cosmological constant, like our own universe. There is still no satisfactory formulation of String Theory on these so called asymptotically de Sitter space times. In this thesis I will discuss certain avenues of progress towards a String Theory formulation of de Sitter spacetimes. Specifically, how understanding of the analytic continuations of Liouville Theory and how to gaugefix it in the Timelike regime will aid in the understanding of the proposed FRWCFT duality of de Sitter space. It is also discussed how nontrivial topology effects proposed ChernSimons Matter duals of Vasiliev Higher Spin gravity theories which are important in the dSCFT description of de Sitter Space
1 edition published in 2013 in English and held by 1 WorldCat member library worldwide
String theory is arguably the best candidate for a theory of quantum gravity and unified interactions. Reconciling Einstein's theory of General Relativity with Quantum Mechanics. The theory however is best understood on Minkowski and Antide Sitter spacetimes, and not on exponentially expanding spacetimes with positive cosmological constant, like our own universe. There is still no satisfactory formulation of String Theory on these so called asymptotically de Sitter space times. In this thesis I will discuss certain avenues of progress towards a String Theory formulation of de Sitter spacetimes. Specifically, how understanding of the analytic continuations of Liouville Theory and how to gaugefix it in the Timelike regime will aid in the understanding of the proposed FRWCFT duality of de Sitter space. It is also discussed how nontrivial topology effects proposed ChernSimons Matter duals of Vasiliev Higher Spin gravity theories which are important in the dSCFT description of de Sitter Space
Holography of de sitter space and disordered systems by George Konstantinidis Coss(
)
1 edition published in 2015 in English and held by 1 WorldCat member library worldwide
This dissertation is devoted to the study of models that capture the intricate dynamics of two different physical setups: exponentially expanding universes and disordered systems. We explore late time divergences in the perturbative corrections of wavefunctions of interacting light fields on a fixed de Sitter background. The divergences are holographically interpreted as shifts in the conformal weights of dual CFT operators. We then compute functional determinants in a Euclidean CFT for various nonperturbative deformations. According to the dS/CFT correspondence, these functional determinants calculate the late time HartleHawking wavefunctional of asymptotically de Sitter space in higher spin gravity as a function of the profile of the fields in the bulk. Numerical experiments suggest that upon fixing the average of the bulk scalar profile, the wavefunction becomes normalizable in all the other (infinite) directions of the deformations we study. For disordered systems, we investigate the extent to which quiver quantum mechanics models encode the complex dynamics of multicentered black holes in string theory. In a certain limit of the quiver system we display the emergence of a conformal symmetry, which mimics the emergence of conformal symmetry in the nearhorizon geometries of extremal black holes. Finally, we take a Newtonian multiparticle limit of the quiver system away from the conformal regime. We study the dynamics of the system numerically to look for signs of ergodicity breaking, cages, and transitions to chaos
1 edition published in 2015 in English and held by 1 WorldCat member library worldwide
This dissertation is devoted to the study of models that capture the intricate dynamics of two different physical setups: exponentially expanding universes and disordered systems. We explore late time divergences in the perturbative corrections of wavefunctions of interacting light fields on a fixed de Sitter background. The divergences are holographically interpreted as shifts in the conformal weights of dual CFT operators. We then compute functional determinants in a Euclidean CFT for various nonperturbative deformations. According to the dS/CFT correspondence, these functional determinants calculate the late time HartleHawking wavefunctional of asymptotically de Sitter space in higher spin gravity as a function of the profile of the fields in the bulk. Numerical experiments suggest that upon fixing the average of the bulk scalar profile, the wavefunction becomes normalizable in all the other (infinite) directions of the deformations we study. For disordered systems, we investigate the extent to which quiver quantum mechanics models encode the complex dynamics of multicentered black holes in string theory. In a certain limit of the quiver system we display the emergence of a conformal symmetry, which mimics the emergence of conformal symmetry in the nearhorizon geometries of extremal black holes. Finally, we take a Newtonian multiparticle limit of the quiver system away from the conformal regime. We study the dynamics of the system numerically to look for signs of ergodicity breaking, cages, and transitions to chaos
Quantum error correction and spacetime by Grant Salton(
)
1 edition published in 2018 in English and held by 1 WorldCat member library worldwide
Quantum error correction (QEC) is a branch of quantum information theory, originally invented to protect hypothetical quantum computers against realistic sources of noise. QEC has enjoyed significant success within the paradigm of computation, but the ideas and techniques of quantum error correction have also been effective in tools many fields of physics. In this thesis, we will shed light on the way in which QEC manifests outside of the usual computational paradigm and informs other areas of physics. We'll focus on the role of QEC in quantum gravity, spacetime, and high energy theoretical physics. We start with the general problem of quantum information replication in spacetime, and we show that information replication is possible if and only if transmission of the quantum information does not result in cloning of quantum information or fasterthanlight communication. We then study the role of quantum error correction in quantum gravity, specifically within a gaugegravity duality known as AdS/CFT. We establish a new formula for mapping observables on either side of the duality, showing that the socalled bulktoboundary map defines an approximate quantum error correcting code. Motivated by the study of entangled states dual to multiboundary wormholes in AdS/CFT, we then turn our attention to characterizing the states that can arise from the euclidean path integral in threedimensional ChernSimons theories. We study U(1) level k and SO(3) level k ChernSimons theories on euclidean 3manifolds with torus boundaries. For the abelian U(1) theory, we find that the set of states that can be prepared exactly coincides with the set of stabilizer states, which are characterized by quantum error correcting codes. For the nonabelian SO(3) theory, we find that any state can be prepared to arbitrary precision, giving rise to a notion of state universality. We conclude with some final observations to support the idea that entanglement gives rise to the connectedness of spacetime. We study the partial transpose of the thermofield double (TFD) state geometrically, and we demonstrate that local time reversal (which is unitarily equivalent to partial transpose) leads to inconsistencies in the connected spacetime dual to the TFD state
1 edition published in 2018 in English and held by 1 WorldCat member library worldwide
Quantum error correction (QEC) is a branch of quantum information theory, originally invented to protect hypothetical quantum computers against realistic sources of noise. QEC has enjoyed significant success within the paradigm of computation, but the ideas and techniques of quantum error correction have also been effective in tools many fields of physics. In this thesis, we will shed light on the way in which QEC manifests outside of the usual computational paradigm and informs other areas of physics. We'll focus on the role of QEC in quantum gravity, spacetime, and high energy theoretical physics. We start with the general problem of quantum information replication in spacetime, and we show that information replication is possible if and only if transmission of the quantum information does not result in cloning of quantum information or fasterthanlight communication. We then study the role of quantum error correction in quantum gravity, specifically within a gaugegravity duality known as AdS/CFT. We establish a new formula for mapping observables on either side of the duality, showing that the socalled bulktoboundary map defines an approximate quantum error correcting code. Motivated by the study of entangled states dual to multiboundary wormholes in AdS/CFT, we then turn our attention to characterizing the states that can arise from the euclidean path integral in threedimensional ChernSimons theories. We study U(1) level k and SO(3) level k ChernSimons theories on euclidean 3manifolds with torus boundaries. For the abelian U(1) theory, we find that the set of states that can be prepared exactly coincides with the set of stabilizer states, which are characterized by quantum error correcting codes. For the nonabelian SO(3) theory, we find that any state can be prepared to arbitrary precision, giving rise to a notion of state universality. We conclude with some final observations to support the idea that entanglement gives rise to the connectedness of spacetime. We study the partial transpose of the thermofield double (TFD) state geometrically, and we demonstrate that local time reversal (which is unitarily equivalent to partial transpose) leads to inconsistencies in the connected spacetime dual to the TFD state
Topics in inflation and eternal inflation by Mahdiyar Noorbala Tafti(
)
1 edition published in 2011 in English and held by 1 WorldCat member library worldwide
This thesis is divided to three parts. In Chapter 1 we study observational signatures of chaotic inflation with nonminimal coupling to gravity. In the next two chapters we focus on the eternal nature of inflation and the measure problem. In Chapter 2 we compare predictions of several measures in eternal versus noneternal inflation. Finally in Chapter 3 we study the Boltzmann brain problem for the scale factor cutoff measure of eternal inflation
1 edition published in 2011 in English and held by 1 WorldCat member library worldwide
This thesis is divided to three parts. In Chapter 1 we study observational signatures of chaotic inflation with nonminimal coupling to gravity. In the next two chapters we focus on the eternal nature of inflation and the measure problem. In Chapter 2 we compare predictions of several measures in eternal versus noneternal inflation. Finally in Chapter 3 we study the Boltzmann brain problem for the scale factor cutoff measure of eternal inflation
Towards a precision measurement of the half life of neutrinoless double beta decay of 136Xe by Francisco Richard LePort(
)
1 edition published in 2011 in English and held by 1 WorldCat member library worldwide
Recent neutrino oscillation experiments provide proof that neutrinos are massive par ticles, but the absolute neutrino mass scale remains unknown. Observation of neu trinoless double betadecay (0vBB), a hypothetical nuclear transition, would provide information on the absolute neutrino mass scale. This decay violates lepton number conservation and requires that neutrinos are massive Majorana particles. Current limits on the halflife of 0vBB are in excess of 10^25 yr. The 200 kg Enriched Xenon Observatory experiment (EXO200) is a double betadecay exper iment designed to improve upon this limit. It is currently in the early stages of commissioning at the Waste Isolation Pilot Plant near Carlsbad, New Mexico. This work discusses first the use of liquid xenon as source and detector medium for double beta decay. The design and construction of EXO200 is then presented, including a detailed prediction of detector backgrounds and sensitivity
1 edition published in 2011 in English and held by 1 WorldCat member library worldwide
Recent neutrino oscillation experiments provide proof that neutrinos are massive par ticles, but the absolute neutrino mass scale remains unknown. Observation of neu trinoless double betadecay (0vBB), a hypothetical nuclear transition, would provide information on the absolute neutrino mass scale. This decay violates lepton number conservation and requires that neutrinos are massive Majorana particles. Current limits on the halflife of 0vBB are in excess of 10^25 yr. The 200 kg Enriched Xenon Observatory experiment (EXO200) is a double betadecay exper iment designed to improve upon this limit. It is currently in the early stages of commissioning at the Waste Isolation Pilot Plant near Carlsbad, New Mexico. This work discusses first the use of liquid xenon as source and detector medium for double beta decay. The design and construction of EXO200 is then presented, including a detailed prediction of detector backgrounds and sensitivity
Black holes and the butterfly effect by Douglas Stanford(
)
1 edition published in 2014 in English and held by 1 WorldCat member library worldwide
What happens if you perturb a small part of a large system, and then you wait a while? If the system is chaotic, one expects the butterfly effect to push the state far from its original trajectory. I will present an analysis of this phenomenon in the setting of a strongly interacting quantum gauge theory, using the tools of gaugegravity duality. The original state corresponds to a black hole geometry, and the perturbation is represented by a particle falling through the horizon. As time passes, the boost of the particle grows exponentially, creating a shock wave that implements the butterfly effect. Building on this framework, I will relate and explore the dynamics of chaos and the region behind the horizon of a black hole. This thesis is based on two papers written with Stephen Shenker. It should not be cited without also referencing those papers
1 edition published in 2014 in English and held by 1 WorldCat member library worldwide
What happens if you perturb a small part of a large system, and then you wait a while? If the system is chaotic, one expects the butterfly effect to push the state far from its original trajectory. I will present an analysis of this phenomenon in the setting of a strongly interacting quantum gauge theory, using the tools of gaugegravity duality. The original state corresponds to a black hole geometry, and the perturbation is represented by a particle falling through the horizon. As time passes, the boost of the particle grows exponentially, creating a shock wave that implements the butterfly effect. Building on this framework, I will relate and explore the dynamics of chaos and the region behind the horizon of a black hole. This thesis is based on two papers written with Stephen Shenker. It should not be cited without also referencing those papers
Stringy nonlocality and black hole physics by Matthew Dodelson(
)
1 edition published in 2018 in English and held by 1 WorldCat member library worldwide
We analyze nonlocal effects in string theory near black hole horizons. Due to extended string effects, early infalling matter can be detected by late observers long after they fall into the black hole. The nonlocal effects are derived via an analysis of the sixpoint string scattering matrix in flat space, as well as by probing the scattering with a background dilaton. We also derive simple new string solutions in three dimensions
1 edition published in 2018 in English and held by 1 WorldCat member library worldwide
We analyze nonlocal effects in string theory near black hole horizons. Due to extended string effects, early infalling matter can be detected by late observers long after they fall into the black hole. The nonlocal effects are derived via an analysis of the sixpoint string scattering matrix in flat space, as well as by probing the scattering with a background dilaton. We also derive simple new string solutions in three dimensions
Towards a precise theory of cosmology by Daniel Lord Harlow(
)
1 edition published in 2012 in English and held by 1 WorldCat member library worldwide
In this thesis I discuss progress towards a precise mathematical description of cosmology and in particular of eternal inflation. I present a conjecture for a necessary condition for a spacetime to have a precise dual description, discuss how the dictionary of dS/CFT is more sophisticated than that of AdS/CFT, present a soluble model of eternal inflation that has a conformal boundary theory at future infinity, and discuss the implications of this model for a conjectured precise dual theory based on observers in bubbles with zero cosmological constant. The work described was done in collaboration with Leonard Susskind, Douglas Stanford, and Stephen Shenker
1 edition published in 2012 in English and held by 1 WorldCat member library worldwide
In this thesis I discuss progress towards a precise mathematical description of cosmology and in particular of eternal inflation. I present a conjecture for a necessary condition for a spacetime to have a precise dual description, discuss how the dictionary of dS/CFT is more sophisticated than that of AdS/CFT, present a soluble model of eternal inflation that has a conformal boundary theory at future infinity, and discuss the implications of this model for a conjectured precise dual theory based on observers in bubbles with zero cosmological constant. The work described was done in collaboration with Leonard Susskind, Douglas Stanford, and Stephen Shenker
Super string theory and the calculation of metastable ground states by Dusan Simic(
)
1 edition published in 2011 in English and held by 1 WorldCat member library worldwide
Super string theory is a candidate theory for the unification of gravity and all the other forces. It is also the arena in which explicit examples of gravity duals of strongly coupled field theories are constructed. In this thesis, we explore various degrees of supersymmetry breaking for strings propagating on gravitational backgrounds which have field theory duals. We analyze a class of cascading quivers arising from near horizon limits of branes at singularities, starting with RG flows which preserve some degree of supersymmetry. We then apply this analysis to cases with supersymmetry breaking. We provide examples in which supersymmetry breaks spontaneously around a metastable groundstate and calculate some of its properties. We finally discuss string models in which supersymmetry is completely broken, including the potential phenomenological applications
1 edition published in 2011 in English and held by 1 WorldCat member library worldwide
Super string theory is a candidate theory for the unification of gravity and all the other forces. It is also the arena in which explicit examples of gravity duals of strongly coupled field theories are constructed. In this thesis, we explore various degrees of supersymmetry breaking for strings propagating on gravitational backgrounds which have field theory duals. We analyze a class of cascading quivers arising from near horizon limits of branes at singularities, starting with RG flows which preserve some degree of supersymmetry. We then apply this analysis to cases with supersymmetry breaking. We provide examples in which supersymmetry breaks spontaneously around a metastable groundstate and calculate some of its properties. We finally discuss string models in which supersymmetry is completely broken, including the potential phenomenological applications
String constructions and cosmological spacetimes by Bartholomew Chisolm Horn(
)
1 edition published in 2012 in English and held by 1 WorldCat member library worldwide
We study connections between the macroscopic features of cosmological spacetimes and the underlying microscopic description. String theory provides a useful toolkit for addressing high energy problems and conceptual issues in gravitational theories, but the questions we hope to address are not necessarily confined to this framework. Models of cosmology derived from string theory generically include additional fields that may affect cosmic inflation and its observables, and they provide a topdown perspective for organizing the predictions of inflationary models. We also use brane constructions to gain a microscopic perspective on dual 'holographic' descriptions for de Sitter and FriedmannRobertsonWalker spacetimes, and we express the horizon entropy in terms of microscopic parameters. Such constructions also motivate more general studies of timedependence in field theories and its effect on renormalization group flow. Finally, we construct an oscillating universe at the level of general relativity using sources satisfying the null energy condition and analyze its stability to linear order, and we discuss the implications for singularity theorems
1 edition published in 2012 in English and held by 1 WorldCat member library worldwide
We study connections between the macroscopic features of cosmological spacetimes and the underlying microscopic description. String theory provides a useful toolkit for addressing high energy problems and conceptual issues in gravitational theories, but the questions we hope to address are not necessarily confined to this framework. Models of cosmology derived from string theory generically include additional fields that may affect cosmic inflation and its observables, and they provide a topdown perspective for organizing the predictions of inflationary models. We also use brane constructions to gain a microscopic perspective on dual 'holographic' descriptions for de Sitter and FriedmannRobertsonWalker spacetimes, and we express the horizon entropy in terms of microscopic parameters. Such constructions also motivate more general studies of timedependence in field theories and its effect on renormalization group flow. Finally, we construct an oscillating universe at the level of general relativity using sources satisfying the null energy condition and analyze its stability to linear order, and we discuss the implications for singularity theorems
Complexity and black hole geometry by Ying Zhao(
)
1 edition published in 2018 in English and held by 1 WorldCat member library worldwide
This thesis discusses various aspects of black hole interior. We explore the connection between black hole geometry and quantum complexity. We look for quantum circuit protocols corresponding to traversable wormhole. We also point out various puzzles we encountered
1 edition published in 2018 in English and held by 1 WorldCat member library worldwide
This thesis discusses various aspects of black hole interior. We explore the connection between black hole geometry and quantum complexity. We look for quantum circuit protocols corresponding to traversable wormhole. We also point out various puzzles we encountered
Holographic models : constraints and constructions by Sho Yaida(
)
1 edition published in 2011 in English and held by 1 WorldCat member library worldwide
Holographic correspondences provide models of strongly correlated systems whose thermodynamic and transport properties are computationally tractable. In this thesis we first provide a class of seemingly innocuous bottomup holographic models which are argued to be inconsistent, violating microcausality. With such cautionary cases in mind, we go on to construct a variety of consistent topdown holographic models. In particular, we engineer holographic lattices, dimers, and dimerglasses, using ingredients in type IIB string theory. Finally, we set up disordered holographic systems and develop technology which enables us to study renormalization group flows and thermodynamic properties in these strongly correlated systems with randomness
1 edition published in 2011 in English and held by 1 WorldCat member library worldwide
Holographic correspondences provide models of strongly correlated systems whose thermodynamic and transport properties are computationally tractable. In this thesis we first provide a class of seemingly innocuous bottomup holographic models which are argued to be inconsistent, violating microcausality. With such cautionary cases in mind, we go on to construct a variety of consistent topdown holographic models. In particular, we engineer holographic lattices, dimers, and dimerglasses, using ingredients in type IIB string theory. Finally, we set up disordered holographic systems and develop technology which enables us to study renormalization group flows and thermodynamic properties in these strongly correlated systems with randomness
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 Stanford University Department of Physics
 Susskind, Leonard Thesis advisor
 Kachru, Shamit 1970 Thesis advisor
 Silverstein, Eva 1970 Thesis advisor
 Hayden, Patrick (Patrick M.) Thesis advisor
 Hartnoll, Sean Thesis advisor
 Maltz, Jonathan David Author
 Stanford, Douglas Author
 Kallosh, Renata Thesis advisor
 Simic, Dusan Author
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Stephen Shenker Amerikaans natuurkundige
Stephen Shenker amerikansk fysikar
Stephen Shenker amerikansk fysiker
Stephen Shenker físico estadounidense
Stephen Shenker physicien américain
Stephen Shenker USamerikanischer Physiker
استفن شنکر فیزیکدان آمریکایی
استیون شنکر
史蒂芬·申克爾
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