George Shiber
/ | Philosophy | Mathematics | String/M-theory | All our scientific and philosophic ideals are altars to unknown gods ― William James
Last synced from Twitter 88d ago
Chapter 1 — Global Warming of 1.5 ºC
Ipcc.ch 199d 2 tweets
Born-Oppenheimer quantization of the matrix model for $\mathcal{N}=1$ super-Yang-Mills theory
Physical Review D 89d 1 tweets
We construct a quantum mechanical matrix model that is a dimensional reduction of $\mathcal{N}=1$ super-Yang-Mills on ${S}^{3}\ifmmode\times\else\texttimes\fi{}\mathbb{R}$. We do so by pulling back the set of left-invariant connections of the gauge...
George Shiber Born-Oppenheimer quantization of the matrix model for N=1 super-Yang-Mills theory Ensemble from coarse graining: Reconstructing the interior of an evaporating black hole Symmetries and strings of Ad-QCD2 89d
Ensemble from coarse graining: Reconstructing the interior of an evaporating black hole
Physical Review D 89d 1 tweets
In understanding the quantum physics of a black hole, nonperturbative aspects of gravity play important roles. In particular, huge gauge redundancies of a gravitational theory at the nonperturbative level, which are much larger than the standard...
George Shiber Born-Oppenheimer quantization of the matrix model for N=1 super-Yang-Mills theory Ensemble from coarse graining: Reconstructing the interior of an evaporating black hole Symmetries and strings of Ad-QCD2 89d
Symmetries and Strings of Adjoint QCD${}_2$
arXiv.org 89d 1 tweets
We revisit the symmetries of massless two-dimensional adjoint QCD with gauge group $SU(N)$. The dynamics is not sufficiently constrained by the ordinary symmetries and anomalies. Here we show that the theory in fact admits $\sim 2^{2N}$...
George Shiber Born-Oppenheimer quantization of the matrix model for N=1 super-Yang-Mills theory Ensemble from coarse graining: Reconstructing the interior of an evaporating black hole Symmetries and strings of Ad-QCD2 89d
All Together Now: Science is Political
Neverjustscience.substack.com 89d 2 tweets
In less than a decade, we’ve moved from “Science has no politics,” to “Science is political but nonpartisan” (the official position of 2017’s March for Science), to “Science Has Always Been Political.” It's kind of thrilling. 
As Election Day Nears, Taking Stock of an Expertise Exodus
Undark Magazine 90d 10 tweets
Eight former government scientists reflect on the circumstances that drove them to leave the Trump administration — and on what was lost.
Standard Model from A Supergravity Model with a Naturally Small Cosmological Constant
arXiv.org 92d 1 tweets
Guided by the naturalness criterion for an exponentially small cosmological constant, we present a string theory motivated 4-dimensional $\mathcal{N}=1$ non-linear supergravity model (or its linear version with a nilpotent superfield) with...
George Shiber The Standard Model from a string-theory motivated supergravity model (with SUSY spontaneously broken) with a naturally small cosmological constant. Deep and beautiful results: read the comments section. 92d
San Francisco Opera | Streaming
Sfopera.com 92d 1 tweets
Hard Problems and Then Some - 3:16
3:16 94d 1 tweets
Motivation is key to fully appreciate why epistemic agency is continuous with cognitive agency and also why knowledge requires the world-directed and selective functions of attention. The prevalence of belief based-accounts of knowledge and...
George Shiber Hard Problems and Then Some Interview with philosopher Carlos Montemayor on consciousness, epistemology, cognitive agency, information theory, monistic and transactional theories of memory, implications for AI, quantum physics & consciousness, and more. 94d
Trailer by Five Questions • A podcast on Anchor
Anchor 96d 1 tweets
I introduce Five Questions, a podcast in which I ask philosophers five questions about themselves. New episodes post on Tuesday mornings.
George Shiber Five Questions: Kieran Setiya (MIT) asks philosophers five questions about themselves. Truly wonderful series. Link to episodes: 96d
The network structure of scientific revolutions
arXiv.org 98d 1 tweets
Philosophers of science have long postulated how collective scientific knowledge grows. Empirical validation has been challenging due to limitations in collecting and systematizing large historical records. Here, we capitalize on the largest online...
Thirty books to help us understand the world in 2020
the Guardian 99d 20 tweets
The climate crisis, gender, populism, big tech, pandemics, race… our experts recommend titles to illuminate the issues of the day
George Shiber Thirty books to help us understand the world in 2020. Highly recommended: —The Great Derangement —Ruling the Void: The Hollowing-out of Western Democracy —Re-Engineering Humanity —Human Compatible: Artificial Intelligence and the Problem of Control 98d
Moral Knowledge // Notre Dame Philosophical Reviews // University of Notre Dame
ND's Web Team - Notre Dame Philosophical Reviews 99d 1 tweets
Notre Dame Philosophical Reviews is an electronic, peer-reviewed journal that publishes timely reviews of scholarly philosophy books.
George Shiber Philosophy book-reviews: —Moral Knowledge —The Phenomenal Basis of Intentionality —The Epistemic Role of Consciousness —Consequentialism: New Directions, New Problems 99d
The Phenomenal Basis of Intentionality // Notre Dame Philosophical Reviews // University of Notre Dame
ND's Web Team - Notre Dame Philosophical Reviews 99d 2 tweets
Notre Dame Philosophical Reviews is an electronic, peer-reviewed journal that publishes timely reviews of scholarly philosophy books.
George Shiber Philosophy book-reviews: —Moral Knowledge —The Phenomenal Basis of Intentionality —The Epistemic Role of Consciousness —Consequentialism: New Directions, New Problems 99d
The Epistemic Role of Consciousness // Notre Dame Philosophical Reviews // University of Notre Dame
ND's Web Team - Notre Dame Philosophical Reviews 99d 1 tweets
Notre Dame Philosophical Reviews is an electronic, peer-reviewed journal that publishes timely reviews of scholarly philosophy books.
George Shiber Philosophy book-reviews: —Moral Knowledge —The Phenomenal Basis of Intentionality —The Epistemic Role of Consciousness —Consequentialism: New Directions, New Problems 99d
Consequentialism: New Directions, New Problems // Notre Dame Philosophical Reviews // University of Notre Dame
ND's Web Team - Notre Dame Philosophical Reviews 99d 1 tweets
Notre Dame Philosophical Reviews is an electronic, peer-reviewed journal that publishes timely reviews of scholarly philosophy books.
George Shiber Philosophy book-reviews: —Moral Knowledge —The Phenomenal Basis of Intentionality —The Epistemic Role of Consciousness —Consequentialism: New Directions, New Problems 99d
Lessons for quantum cosmology from anti--de Sitter black holes
Physical Review D 101d 1 tweets
Gravitational physics is arguably better understood in the presence of a negative cosmological constant than a positive one, yet there exist strong technical similarities between the two settings. These similarities can be exploited to enhance our...
George Shiber Lessons for Quantum Cosmology from anti–de Sitter Black Holes “The idea is to make use of the firm results for the thermodynamics of black holes to learn lessons for path integrals in quantum cosmology.” 101d
Singularity Theorems in the Effective Field Theory for Quantum Gravity at Second Order in Curvature
MDPI 104d 1 tweets
In this paper, we discuss singularity theorems in quantum gravity using effective field theory methods. To second order in curvature, the effective field theory contains two new degrees of freedom which have important implications for the derivation...
George Shiber On the invalidity of Penrose-Hawking type Singularity Theorems in quantum gravity using effective field theory methods String landscape guide to soft SUSY breaking terms 104d
String landscape guide to soft SUSY breaking terms
Physical Review D 104d 1 tweets
We examine several issues pertaining to statistical predictivity of the string theory landscape for weak scale supersymmetry (SUSY). We work within a predictive landscape wherein superrenormalizable terms scan while renormalizable terms do not. We...
George Shiber On the invalidity of Penrose-Hawking type Singularity Theorems in quantum gravity using effective field theory methods String landscape guide to soft SUSY breaking terms 104d
The Sedition of Donald Trump
Rolling Stone 106d 3 tweets
Historian Sean Wilientz says the president and his chief accomplice Attorney General Bill Barr’s subversions of democracy have taken America to the very brink
George Shiber 𝐓𝐇𝐄 𝐒𝐄𝐃𝐈𝐓𝐈𝐎𝐍 𝐎𝐅 𝐃𝐎𝐍𝐀𝐋𝐃 𝐓𝐑𝐔𝐌𝐏 How the president and his chief accomplice Attorney General Bill Barr’s subversions of democracy have taken America to the very brink Great piece by historian Sean Wilientz 105d