Calendar

Inflationary cosmology’s account for the emergence of the seeds of structure in the universe out of primordial quantum fluctuations is empirically successful as far as the so called scalar modes is concerned, but not so regarding the tensor modes. On the other hand, the usual account has some serious conceptual problems, connected to the quantum macro-objectification question. In the search for an approach to resolve the latter, we find substantially modified predictions (with respect to the standard ones) for one of the observables, specifically the estimates for the amplitude and shape of the  spectrum primordial gravity waves. This is an interesting example, where considerations that might have initially thought to be “just of philosophical interest” actually led to  novel and (so far better) predictions for empirical facts.

There will be at least three MAPS talks this semester (I am still waiting to hear back regarding a fourth). The preliminary schedule below should convey a sense of the basic plan.

A number of invited speakers asked to visit in Spring 2019 or Fall 2019 instead of this fall. In case you are interested, I list those future speakers below.

Best,
Isaac

I introduce a sequence which I call indefinite: a sequence every element of which has a successor but whose number of elements is bounded; this is no contradiction. I then consider the possibility of space and time being indefinitely divisible. This is theoretically possible and agrees with experience. If this is space and time’s structure, then even if the laws of nature are deterministic, the behaviour of physical systems will be probabilistic. This approach might also shed light on directionality in time and other physical phenomena.

There will be dinner after the talk. If you are interested, please send an email with “Dinner” in the heading to nyphilsci@gmail.com (please note that all are welcome, but only the speaker’s dinner will be covered). If you have any other questions, please email isaac.wilhelm@rutgers.edu.

Upcoming Talks

Mario Hubert (Columbia)
4:30-6:30pm Wednesday Nov 28; location TBD.

Title: When Fields Are Not Degrees of Freedom (joint work with Vera Hartenstein).

Abstract: We show that in the Maxwell–Lorentz theory of classical electrodynamics most initial values for fields and particles lead to an ill-defined dynamics, as they exhibit singularities or discontinuities along light-cones. This phenomenon suggests that the Maxwell equations and the Lorentz force law ought rather to be read as a system of delay differential equations, that is, differential equations that relate a function and its derivatives at different times. This mathematical reformulation, however, leads to physical and philosophical consequences for the ontological status of the electromagnetic field. In particular, fields cannot be taken as independent degrees of freedom, which suggests that one should not add them to the ontology.

We show that in the Maxwell–Lorentz theory of classical electrodynamics most initial values for fields and particles lead to an ill-defined dynamics, as they exhibit singularities or discontinuities along light-cones. This phenomenon suggests that the Maxwell equations and the Lorentz force law ought rather to be read as a system of delay differential equations, that is, differential equations that relate a function and its derivatives at different times. This mathematical reformulation, however, leads to physical and philosophical consequences for the ontological status of the electromagnetic field. In particular, fields cannot be taken as independent degrees of freedom, which suggests that one should not add them to the ontology.

(joint work with Vera Hartenstein)

There will be dinner after the talk. If you are interested, please send an email with “Dinner” in the heading to nyphilsci@gmail.com (please note that all are welcome, but only the speaker’s dinner will be covered). If you have any other questions, please email isaac.wilhelm@rutgers.edu.

MAPS is supported by Rutgers, Columbia, NYU, and most recently, a generous gift from member Dan Pinkel.

I argue that we do not understand gauge theory as well as we think we do, when boundaries are present. I will briefly explain the conceptual and technical issues that arise at the boundary. I will then propose a tentative resolution, which requires us to think of theories not in space-time, but in field-space.

Motivated by considerations from relativity theory, philosophers have recently contended that talk about an object’s existence in time should not be taken as fundamental, but rather analysed in the language of a formal theory of location in spacetime. This suggestion has important consequences for the debate about persistence: how do ordinary objects exist at different times? It has triggered a program of recovery whereby the main views from the classical debate, previously expressed using the language of temporal mereology, have been redefined in a locational framework. In this paper, I extend this program to the stage theory of persistence, the view according to which objects are instantaneous three-dimensional stages which exist at different times by virtue of having counterparts at these times. I offer a new characterization of the view, the first in a purely locational language, and argue that this locational approach helps dissolve confusions about the view.

The Logic and Metaphysics Workshop will be meeting on Mondays from 4:15 to 6:15 in room TBD of the Graduate Center, CUNY (365 5th Avenue). The (provisional) schedule is as follows:

Feb 4. Melvin Fitting, CUNY

Feb 11. Benjamin Neeser, Geneva

Feb 18. GC CLOSED. NO MEETING

Feb 25. Achille Varzi, Columbia

Mar 4. Eric Bayruns Garcia, CUNY

Mar 11. Romina Padro, CUNY

Mar 18. Jeremy Goodman, USC

Mar 25. Kit Fine, NYU

Apr 1. Elena Ficara, Paderborn

Apr 8. Chris Scambler, NYU

Apr 15.  Jenn McDonald, CUNY

Apr 22. GC CLOSED. NO MEETING

Apr 29. Tommy Kivatinos, CUNY

May 6. Daniel Durante, Natal

May 13. Martina Botti, Columbia

May 20. Vincent Peluce, CUNY

Physicists and philosophers question the validity of one of the most observed and seemingly obvious appearance in our world: that time flows. Many in the physics and philosophy communities contend that the flow of time is not a fundamental feature of the world, nor even a fact of the world, but is an illusion. As a case in point, we will consider Brian Greene’s view of time in his PBS exposition “The Elegant Universe” holding that time may not flow, the past may not be gone, the future may already exist, and that now is not special. Most people, as observers of time’s passage, might agree with the Greek philosopher Heraclitus who expressed the idea that all is change and that change occurs with the flow of time. I will explore some of the motivation and reasons given for these positions and contrast the arguments made for each viewpoint.

The schedule: a short presentation on topic of 3-D Printing, and then Stuart’s presentation for about 1 hr. plus time for questions.  It is necessary to register beforehand to be admitted.

CV: Stuart Kurtz graduated from MIT with an SB in Chemical Engineering and from Princeton with an MS degree in Polymer Engineering and an MA and PhD. in Chemical Engineering.  He taught at RPI and in Brazil as Professor Titular in Materials Engineering.  This was followed by a research career in industry accumulating around 30 patents and publishing at least a few good papers.   He now focuses on Philosophy of Science and Physics and climbing mountains because they are there. He has spoken to the Lyceum Society many times; most recently in January, 2018  he spoke on the topic: Lessons from Science Lysenko, Velikovsky and the Demarcation Problem; In February, 2018 he spoke on Geoengineering for Climate Change Mitigation.  In December, 2018 he reviewed the Nobel Prize in Physics for that year.