Hadamard States and Two-dimensional Gravity

We have used a two-dimensional analog of the Hadamard state-condition to study the local constraints on the two-point function of a linear quantum field conformally coupled to a two-dimensional gravitational background. We develop a dynamical model in which the determination of the state of the quantum field is essentially related to the determination of a conformal frame. A particular conformal frame is then introduced in which a two-dimensional gravitational equation is established.Comment: 7 pages, no figur

First In the Nation’s History: Gettysburg From Battlefield Memorial Association to National Park

Just over a month after the Battle of Gettysburg turned the town on its head, local attorney David McConaughy sent a letter to several prominent citizens suggesting that “there could be no more fitting and expressive memorial of the heroic valor and signal triumphs of our army…than the battle-field itself.” He had already purchased some of the ground, and in order to keep the effort going, he suggested trying to get Pennsylvania citizens to contribute money to purchase and preserve more. In order to manage this fund and the battlefield, McConaughy proposed the formation of a preservation association and made a plan to seek its formal incorporation by the State Legislature. The idea went over well with the local citizens, and on September 5, 1863, they and McConaughy met to consider the matter of battlefield preservation. What they established was Gettysburg’s first preservation organization and the nation’s earliest attempt to preserve a Civil War battlefield. [excerpt

Lincoln’s First 100 Days

Imagine trying to avoid a civil war and then having to figure out how to fight one—all in one’s first 100 days in office and all without Congress. That was what Abraham Lincoln’s first 100 days as president essentially looked like. From his first full day in office on March 5th, 1861 to his 100th day in the middle of June, Lincoln barely had time to handle the things presidents normally did, never mind relax

Why Does Sweden Have Higher Levels of Voter Turnout Than Finland?

Voter turnout is considered the “canary in the coal mine” when it comes to assessing the health of civic participation in a democracy; low turnout in particular is indicative of broader problems. Although voter turnout is quite high in both Sweden and Finland, turnout is notably higher in Sweden despite a long list of similarities between the two countries. Why is there this puzzling discrepancy? This paper employs a “most similar systems” research design to consider a wide variety of factors that can affect voter turnout and ultimately concludes that the difference lies in several different features of the two countries’ electoral systems. These features include the method used to translate votes into seats, constituency size, the number of political parties, type of ballot used, and presence or absence of compulsory voting laws

The 2016 Fortenbaugh Lecture: Individual Responses to Lincoln’s Assassination

Every year on November 19th, the anniversary of the Gettysburg Address, a distinguished scholar of the Civil War Era is invited to speak as part of the Robert Fortenbaugh Memorial Lecture and present an aspect of the Civil War in a format that the general public can understand. This year, the 55th annual Fortenbaugh Memorial Lecture was delivered by Dr. Martha Hodes of New York University. Dr. Hodes’ lecture was based on her book Mourning Lincoln and argued, based on personal primary sources from the immediate aftermath of Abraham Lincoln’s assassination, that Americans’ responses were by no means consistent. Not everyone mourned, nor was everyone totally focused on the assassination, partly because there were differing visions for the nation’s future. [excerpt

“This Is War”: The Construction of the Laird Rams

By the spring of 1863, American ambassador to England Charles Francis Adams had a much bigger problem than the activities of British-built Confederate raiders on his hands: the construction of two 230-foot long ironclad rams in the Laird shipyard at Birkenhead that evidence suggested were destined for the Confederacy. At 230 feet long and 40 feet wide, with 6-7 foot iron spears at the front, rotating turret batteries, full iron plating, and a top speed of 10 knots, these ships were the Americans’ worst nightmare. Lincoln’s cabinet even considered blatantly ignoring Britain’s “neutrality” and sending a U.S. Navy squadron to destroy the rams, which had been under construction since the previous summer

Something Must Be Done: The Construction and Dedication of the Soldiers’ National Cemetery at Gettysburg

Not only did the armies leave something of a state of chaos behind them after the battle of Gettysburg; they also left their dead buried poorly almost everywhere. Within days, the combination of rain and pigs rooting around the battlefield had exposed multiple skeletons and partially-decomposed bodies. The smell was horrendous, and residents and visitors alike were shocked by the state of the burials. [excerpt

The Corwin Amendment: The Last Last-Minute Attempt to Save the Union

At around 5:20AM on March 4, 1861—Inauguration Day—the Senate voted 24-12 to pass a proposed amendment to the Constitution that would permanently preserve slavery in the states where it currently existed. If successfully ratified, it would become the 13th Amendment to the United States Constitution—and hopefully avert the secession crisis and the impending Civil War. However, only six states had ratified the amendment by early 1862, and the amendment died soon after. The last attempt to stop the Civil War, an attempt which had been in the works since shortly after the presidential election, had failed

Perturbative renormalization of the electric field correlator

The momentum diffusion coefficient of a heavy quark in a hot QCD plasma can be extracted as a transport coefficient related to the correlator of two colour-electric fields dressing a Polyakov loop. We determine the perturbative renormalization factor for a particular lattice discretization of this correlator within Wilson's SU(3) gauge theory, finding a ~12% NLO correction for values of the bare coupling used in the current generation of simulations. The impact of this result on existing lattice determinations is commented upon, and a possibility for non-perturbative renormalization through the gradient flow is pointed out.Comment: 15 pages. v2: published versio