Causal Paradoxes

2018 ◽  
Author(s):  
Ryan Wasserman
Keyword(s):  
Life Cycle ◽  
Time Travel ◽  
Causal Loop ◽  
Ex Nihilo ◽  
Backward Causation

Chapter 5 surveys the various causal paradoxes of time travel. Section 1 introduces the concept of a causal loop and reviews some of the standard arguments against backward causation. Sections 2 focuses on the bootstrapping paradox, and the question of whether or not time travel allows for self-caused events. Section 3 addresses the ex nihilo paradox, and the question of whether or not time travel allows for uncaused events. Section 4 looks at the restoration paradox, and the question of how to understand the life cycle of an object in a causal loop. Section 5 considers D. H. Mellor’s frequency-based argument against causal loops. Section 6 discusses Michael Tooley’s counterfactual-based argument against backward causation.

scholarly journals Self-Fulfilling Prophecies

Philosophies ◽  
2021 ◽  
Vol 6 (3) ◽  
pp. 78
Author(s):  
Stephanie Rennick
Keyword(s):  
Time Travel ◽  
Philosophy Of Time ◽  
Causal Loop ◽  
The Future ◽  
Future Self ◽  
Beliefs About The Future ◽  
Theoretical Cost

Causal loops are a recurring feature in the philosophy of time travel, where it is generally agreed that they are logically possible but may come with a theoretical cost. This paper introduces an unfamiliar set of causal loop cases involving knowledge or beliefs about the future: self-fulfilling prophecy loops (SFP loops). I show how and when such loops arise and consider their relationship to more familiar causal loops.

The Reason the Universe Exists is that it Caused Itself to Exist

Philosophy ◽  
1999 ◽  
Vol 74 (4) ◽  
pp. 579-586
Author(s):  
Quentin Smith
Keyword(s):  
Big Bang ◽  
The Other ◽  
Brute Fact ◽  
Causal Loop ◽  
The Big Bang ◽  
The Universe ◽  
Backward Causation

Philosophers have traditionally responded to the question, ‘why does the universe exist?’, in one of two ways. One response is that ‘the universe exists because God created it’ and the other response is that ‘the universe exists for no reason—its existence is a brute fact’. Both these responses are inadequate, since a third response is possible, namely, that the reason the universe exists is that it caused itself to exist. There are at least three ways the universe can cause itself to exist, by (1) a closed, simultaneous causal loop at the first instant of time, (2) beginning with a continuum of instantaneous states in a first half-open second, with each state being caused by earlier states, and (3) being caused to exist by backward causation, where a later event causes the big bang to occur. This suggests that the principle, ‘if the universe begins to exist, it has a cause’ does not support theism (as traditionally has been thought) but instead supports atheism.

Paradoxes of Time Travel

2018 ◽  
Author(s):  
Ryan Wasserman
Keyword(s):  
Time Travel ◽  
Twin Paradox ◽  
Central Question ◽  
Double Occupancy ◽  
Occupancy Problem ◽  
Laws Of Metaphysics ◽  
Theories Of Change ◽  
Backward Causation ◽  
Comprehensive Study

Paradoxes of Time Travel is a comprehensive study of the philosophical issues raised by the possibility of time travel. The book begins, in Chapter 1, by explaining the concept of time travel and clarifying the central question to be addressed: Is time travel compatible with the laws of metaphysics and, in particular, the laws concerning time, freedom, causation, and identity? Chapter 2 then explores the various temporal paradoxes, including the double-occupancy problem, the no-destination argument, and the famous twin paradox of special relativity. Chapters 3 and 4 focus on the paradoxes of freedom, including various versions of the grandfather paradox. Chapter 5 covers causal paradoxes, including the bootstrapping paradox, the problems of backward causation, and the various puzzles raised by causal loops. Chapter 6 then concludes by looking at various paradoxes of identity. This includes a discussion of different theories of change and persistence, and an exploration of the various puzzles raised by self-visitation.

scholarly journals Does Artistic Value Pose a Special Problem for Time Travel Theories?

2019 ◽  
Vol 60 (1) ◽  
pp. 61-69
Author(s):  
James W McAllister
Keyword(s):  
Special Problem ◽  
Time Travel ◽  
Causal Loop ◽  
Michael Dummett ◽  
Artistic Value ◽  
The Future ◽  
The Status

Abstract Michael Dummett and Storrs McCall have claimed that time travel scenarios in which an artist copies an artwork from a reproduction of it that has been sent from the future introduce a causal loop of a new kind: one involving artistic value. They have suggested that this poses a hitherto unacknowledged challenge to time travel theories. I argue that their conclusion depends on some unstated essentialist assumptions about metaphysics of art and the status of representations. By relaxing these assumptions, I show that Dummett and McCall’s scenarios contain no causal loop involving artistic value, and thus pose no new problem for time travel theories.

Ultrastructural analysis of “Sensory” surface nerve endings and “putative” neurotransmitter sites in Schistosoma mansoni Miracidia

1989 ◽  
Vol 47 ◽  
pp. 962-963
Author(s):  
Betty Ruth Jones ◽  
Steve Chi-Tang Pan
Keyword(s):  
Nervous System ◽  
Life Cycle ◽  
Schistosoma Mansoni ◽  
Snail Host ◽  
Complex Life Cycle ◽  
Rational Approach ◽  
Effective Control ◽  
The Social ◽  
Social And Economic Development ◽  
Basic Biology

INTRODUCTION: Schistosomiasis has been described as “one of the most devastating diseases of mankind, second only to malaria in its deleterious effects on the social and economic development of populations in many warm areas of the world.” The disease is worldwide and is probably spreading faster and becoming more intense than the overall research efforts designed to provide the basis for countering it. Moreover, there are indications that the development of water resources and the demands for increasing cultivation and food in developing countries may prevent adequate control of the disease and thus the number of infections are increasing.Our knowledge of the basic biology of the parasites causing the disease is far from adequate. Such knowledge is essential if we are to develop a rational approach to the effective control of human schistosomiasis. The miracidium is the first infective stage in the complex life cycle of schistosomes. The future of the entire life cycle depends on the capacity and ability of this organism to locate and enter a suitable snail host for further development, Little is known about the nervous system of the miracidium of Schistosoma mansoni and of other trematodes. Studies indicate that miracidia contain a well developed and complex nervous system that may aid the larvae in locating and entering a susceptible snail host (Wilson, 1970; Brooker, 1972; Chernin, 1974; Pan, 1980; Mehlhorn, 1988; and Jones, 1987-1988).

A freeze-fracture-etched study of the physarum polycephalum plasma membrane during early formation of the macroplasmodial stage

1993 ◽  
Vol 51 ◽  
pp. 346-347
Author(s):  
Randolph W. Taylor ◽  
Henrie Treadwell
Keyword(s):  
Plasma Membrane ◽  
Life Cycle ◽  
Growth Phase ◽  
Filter Paper ◽  
Physarum Polycephalum ◽  
Freeze Fracture ◽  
Petri Dish ◽  
Wire Screen ◽  
Wide Mouth ◽  
Sterile Filter

The plasma membrane of the Slime Mold, Physarum polycephalum, process unique morphological distinctions at different stages of the life cycle. Investigations of the plasma membrane of P. polycephalum, particularly, the arrangements of the intramembranous particles has provided useful information concerning possible changes occurring in higher organisms. In this report Freeze-fracture-etched techniques were used to investigate 3 hours post-fusion of the macroplasmodia stage of the P. polycephalum plasma membrane.Microplasmodia of Physarum polycephalum (M3C), axenically maintained, were collected in mid-expotential growth phase by centrifugation. Aliquots of microplasmodia were spread in 3 cm circles with a wide mouth pipette onto sterile filter paper which was supported on a wire screen contained in a petri dish. The cells were starved for 2 hrs at 24°C. After starvation, the cells were feed semidefined medium supplemented with hemin and incubated at 24°C. Three hours after incubation, samples were collected randomly from the petri plates, placed in plancettes and frozen with a propane-nitrogen jet freezer.

A Spreadsheet Life Cycle Cost Model for System Modernization Studies

1994 ◽  
Vol 11 (1) ◽  
pp. 47-56
Author(s):  
Virginia C. Day ◽  
Zachary F. Lansdowne ◽  
Richard A Moynihan ◽  
John A. Vitkevich
Keyword(s):  
Life Cycle ◽  
Life Cycle Cost ◽  
Cost Model

The Life-Cycle for the Student Physician

1978 ◽  
Vol 23 (2) ◽  
pp. 85-86
Author(s):  
BERTRAM J. COHLER
Keyword(s):  
Life Cycle ◽  
Student Physician
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