# Seminars & Colloquia Calendar

## Unimodular Bohmian Geometrodynamics

#### Maaneli Derakhshani - Rutgers University

Location: ** Hill 705**

Date & time: Thursday, 12 September 2019 at 2:00PM - 3:00PM

ABSTRACT: Quantum geometrodynamics (QGD), the version of quantum gravity based on the Wheeler-DeWitt equation, is perhaps the most well-known approach to canonical quantization of general relativity theory. It is known that QGD suffers from three interrelated problems [1, 2, 3]: 1) the Problem of Time, 2) the Quantum Measurement Problem, and 3) the Hilbert Space Problem. As a response to these problems, some researchers have combined geometrodynamics with the Bohmian approach to quantum theory [2, 3], and it has been argued that Bohmian geometrodynamics (BGD) can overcome some or all of these problems.

As another response to the above problems, I will discuss current work combining "unimodular" geometrodynamics [4] with the Bohmian approach to quantum theory. I will argue that:

(i) unimodular Bohmian geometrodynamics (UBGD) is free of problems 1) and 2), and probably can overcome problem 3);

(ii) UBGD makes it possible to describe sub-systems of the quantum-gravitational and matter degrees of freedom via 'conditional wave functionals' and their corresponding equations of motion; and

(iii) the Bohmian semiclassical approximation technique discussed in [5] can be formally extended to UBGD, thereby making possible the formulation of 'semiclassical UBGD'. Time permitting, I will then compare and contrast UBGD with BGD.

Chiara Damiolini, Ian Coley and Franco Rota -Charles Weibel Organizer's Page

Brooke Logan

Wujun Zhang Organizer's webpage

Ziming Shi, Sagun Chanillo, Xiaojun Huang, Chi Li, Jian Song Seminar website Old seminar website

Swastik Kopparty, Sepehr Assadi Seminar webpage

Jeffry Kahn, Bhargav Narayanan, Jinyoung Park Organizer's webpage

Brooke Ogrodnik, Website

Robert Dougherty-Bliss and Doron Zeilberger --> homepage

Paul Feehan, Daniel Ketover, Natasa Sesum Organizer's webpage

Lev Borisov, Emanuel Diaconescu, Angela Gibney, Nicolas Tarasca, and Chris Woodward Organizer's webpage

Jason Saied Seminar webpage

Brian Pinsky, Rashmika Goswami website

Quentin Dubroff Organizer's webpage

James Holland; Organizer website

Edna Jones Organizer's webpage

Brooke Ogrodnik website

Yanyan Li, Zheng-Chao Han, Jian Song, Natasa Sesum Organizer's Webpage

Organizer: Luochen Zhao

Yanyan Li, Zheng-Chao Han, Natasa Sesum, Jian Song Organizer's Page

Lisa Carbone, Yi-Zhi Huang, James Lepowsky, Siddhartha Sahi Organizer's webpage

Simon Thomas website

Kasper Larsen, Daniel Ocone and Kim Weston Organizer's page

Joel Lebowitz, Michael Kiessling

Yanyan Li, Haim Brezis Organizer's Webpage

Stephen D. Miller, John C. Miller, Alex V. Kontorovich, Alex Walker seminar website

Stephen D. Miller

Brooke Ogrodnik, Website

Organizers: Yanyan Li, Z.C. Han, Jian Song, Natasa Sesum

Yael Davidov Seminar webpage

Kristen Hendricks, Xiaochun Rong, Hongbin Sun, Chenxi Wu Organizer's page

Fioralba Cakoni Seminar webpage

Ebru Toprak, Organizer

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