Subtle Is the Lord: The Science and the Life of Albert Einstein

By Abraham Pais | Go to book overview

17
Unified Field Theory

17a. Particles and Fields around 1920

Einstein died early on a Monday morning. The day before, he had asked for his most recent pages of calculations on unified field theory. The awareness of unfinished work was with him, and not just in those final hours when he knew that death was near. It had been so throughout his life. Nearly forty years earlier, he had written to Felix Klein:

However we select from nature a complex [of phenomena] using the criterion of simplicity, in no case will its theoretical treatment turn out to be forever appropriate (sufficient). Newton's theory, for example, represents the gravitational field in a seemingly complete way by means of the potential ϕ. This description proves to be wanting; the functions gμν take its place. But I do not doubt that the day will come when that description, too, will have to yield to another one, for reasons which at present we do not yet surmise. I believe that this process of deepening the theory has no limits. [E1]

That was written in 1917, shortly before he began his search for the unification of gravitation and electromagnetism. Those were still the days in which he knew with unerring instinct how to select complexes from nature to guide his scientific steps. Even then he already had a keen taste for mathematical elegance as well, but did not yet believe that formal arguments alone could be relied upon as markers for the next progress in physics. Thus, later in 1917, when Felix Klein wrote to him about the conformal invariance of the Maxwell equations [K1], he replied:

It does seem to me that you highly overrate the value of formal points of view. These may be valuable when an already found [his italics] truth needs to be formulated in a final form, but fail almost always as heuristic aids. [E2]

Nothing is more striking about the later Einstein than his change of position in regard to this advice, given when he was in his late thirties. I do not believe that his excessive reliance in later years on formal simplicity did him much good, although I do not accept the view of some that this change was tragic. Nothing in Einstein's scientific career was tragic, even though some of his work will be remembered forever and some of it will be forgotten. In any event, when Einstein embarked on his program for a unified field theory, his motivation was thoroughly

-325-

Notes for this page

Add a new note
If you are trying to select text to create highlights or citations, remember that you must now click or tap on the first word, and then click or tap on the last word.
One moment ...
Default project is now your active project.
Project items

Items saved from this book

This book has been saved
Highlights (0)
Some of your highlights are legacy items.

Highlights saved before July 30, 2012 will not be displayed on their respective source pages.

You can easily re-create the highlights by opening the book page or article, selecting the text, and clicking “Highlight.”

Citations (0)
Some of your citations are legacy items.

Any citation created before July 30, 2012 will labeled as a “Cited page.” New citations will be saved as cited passages, pages or articles.

We also added the ability to view new citations from your projects or the book or article where you created them.

Notes (0)
Bookmarks (0)

You have no saved items from this book

Project items include:
  • Saved book/article
  • Highlights
  • Quotes/citations
  • Notes
  • Bookmarks
Notes
Cite this page

Cited page

Style
Citations are available only to our active members.
Sign up now to cite pages or passages in MLA, APA and Chicago citation styles.

(Einhorn, 1992, p. 25)

(Einhorn 25)

1

1. Lois J. Einhorn, Abraham Lincoln, the Orator: Penetrating the Lincoln Legend (Westport, CT: Greenwood Press, 1992), 25, http://www.questia.com/read/27419298.

Cited page

Bookmark this page
Subtle Is the Lord: The Science and the Life of Albert Einstein
Table of contents

Table of contents

  • Title Page iii
  • To the Reader vii
  • Contents (entries in Italics Are Almost Entirely Biographical) xi
  • I- Introductory 3
  • 1- Purpose and Plan 5
  • 2- Relativity Theory and Quantum Theory 26
  • 3 - Portrait of the Physicist as a Young Man 49
  • II- Statistical Physics 53
  • 4- Entropy and Probability 55
  • 5- The Reality of Molecules 79
  • III- Relativity, the Special Theory 109
  • 6- ''subtle is the Lord . . .'' 111
  • 7- The New Kinematics 138
  • 8- The Edge of History 163
  • IV- Relativity, the General Theory 175
  • 9- ''The Happiest Thought of My Life'' 177
  • References 184
  • 10- Herr Professor Einstein 190
  • 11- The Prague Papers 192
  • 12- The Einstein-Grossmann Collaboration 208
  • 12- The Einstein-Grossmann Collaboration 208
  • References 228
  • 13- Field Theories of Gravitation 237
  • 14- The Field Equations of Gravitation 239
  • 15 - The New Dynamics 292
  • V- The Later Journey 297
  • 16- ''The Suddenly Famous Doctor Einstein'' 299
  • 17- Unified Field Theory 325
  • VI - The Quantum Theory 355
  • 18 - Preliminaries 363
  • 19- The Light-Quantum 364
  • 20- Einstein and Specific Heats 389
  • 21- The Photon 402
  • 22- Interlude- The Bks Proposal 416
  • 23- A Loss of Identity 423
  • 24- Einstein as a Transitional Figure 435
  • 25- Einstein''s Response to the New Dynamics 440
  • 26- Einstein''s Vision 460
  • VII- Journey''s End 471
  • 27- The Final Decade 473
  • 28- Epilogue 479
  • VIII- Appendices 481
  • 29- Of Tensors and a Hearing Aid and Many Other Things 483
  • 30- How Einstein Got the Nobel Prize 502
  • 31 - Einstein''s Proposals for the Nobel Prize 518
  • 32- An Einstein Chronology 520
  • Name Index 531
  • Subject Index 539
Settings

Settings

Typeface
Text size Smaller Larger Reset View mode
Search within

Search within this book

Look up

Look up a word

  • Dictionary
  • Thesaurus
Please submit a word or phrase above.
Print this page

Print this page

Why can't I print more than one page at a time?

Help
Full screen
/ 560

matching results for page

    Questia reader help

    How to highlight and cite specific passages

    1. Click or tap the first word you want to select.
    2. Click or tap the last word you want to select, and you’ll see everything in between get selected.
    3. You’ll then get a menu of options like creating a highlight or a citation from that passage of text.

    OK, got it!

    Cited passage

    Style
    Citations are available only to our active members.
    Sign up now to cite pages or passages in MLA, APA and Chicago citation styles.

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences." (Einhorn, 1992, p. 25).

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences." (Einhorn 25)

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences."1

    1. Lois J. Einhorn, Abraham Lincoln, the Orator: Penetrating the Lincoln Legend (Westport, CT: Greenwood Press, 1992), 25, http://www.questia.com/read/27419298.

    Cited passage

    Thanks for trying Questia!

    Please continue trying out our research tools, but please note, full functionality is available only to our active members.

    Your work will be lost once you leave this Web page.

    For full access in an ad-free environment, sign up now for a FREE, 1-day trial.

    Already a member? Log in now.