Capillarity Paper
Publishes his first scientific paper, examining molecular forces through capillary phenomena.
Albert Einstein · Place
Zurich
42 Einstein records associated with Zurich.
Swiss Citizenship
Einstein becomes a Swiss citizen after having been stateless since 1896.
Doctoral Dissertation Submitted
Submits A New Determination of Molecular Dimensions as his doctoral dissertation at the University of Zurich.
Doctorate Approved
The University of Zurich faculty unanimously approves Einstein's doctoral dissertation.
Doctorate Formally Awarded
The University of Zurich formally awards Einstein his doctorate in physics.
Particle Contribution Identified in Radiation Fluctuations
A second term in Einstein's fluctuation analysis had the form associated with independently moving energy quanta, strengthening his argument that radiation also possesses particle-like properties.
Radiation Fluctuation Formula Separates Two Terms
Einstein derived a thermal-radiation fluctuation expression containing two distinct contributions, one with wave-like behaviour and another with the statistical form expected from independent quanta.
Radiation Pressure Fluctuations Analyzed
Einstein studied statistical fluctuations in radiation pressure and used them to expose both continuous-wave and discrete-quantum aspects of thermal radiation.
Thermal Radiation Statistics Support Quantum Picture
Einstein used the statistical behaviour of black-body radiation to argue that purely classical wave theory could not account for all observed fluctuations in radiant energy.
University of Zurich Appointment
Becomes associate professor of theoretical physics at the University of Zurich.
Wave Contribution Identified in Radiation Fluctuations
Einstein interpreted one part of the radiation fluctuation formula as the signature of interference and wave structure within the electromagnetic field.
Zurich Physical Society Membership
Becomes a member of the Physical Society of Zurich.
Critical Opalescence Theory
Explains critical opalescence using fluctuations near a liquid-gas critical point.
Einstein-Hopff Thermal Radiation Model Developed
Einstein and Ludwig Hopf analysed a moving oscillator interacting with random thermal radiation to investigate the conditions required for matter and radiation to reach statistical equilibrium.
French Review of Relativity
Presents the principle of relativity and its consequences for modern physics to a wider European audience in a substantial French-language review.
Oscillator Momentum Diffusion from Radiation Studied
Einstein and Hopf examined how random radiation forces continually alter an oscillator's momentum while dissipative drag acts in the opposite direction.
Radiation Drag on Moving Oscillator Derived
In the Einstein-Hopff treatment, motion through a thermal radiation field produced a friction-like drag on an oscillator, linking electromagnetic fluctuations with Brownian-style dynamics.
Thermal Radiation Equilibrium Conditions Tested
The Einstein-Hopff analysis tested whether classical interactions between oscillators and radiation could reproduce a consistent equilibrium spectrum, revealing limitations of a purely classical treatment.
Curved Spacetime Approach Takes Shape
Einstein's Zurich work moved toward describing gravity through non-Euclidean spacetime geometry, connecting gravitational phenomena with the mathematical curvature of the metric.
Grossmann Tensor Collaboration
Collaborates closely with Marcel Grossmann, who guides him toward Ricci and Levi-Civita tensor calculus as the mathematical language for gravitation.
Metric Tensor Becomes Gravitational Variable
Einstein increasingly identified the spacetime metric as the quantity that should represent gravitation, replacing the idea of gravity as an ordinary force field on fixed space and time.
Ricci Calculus Adopted for Gravity
With Marcel Grossmann's mathematical guidance, Einstein began using Ricci and Levi-Civita tensor calculus as the formal machinery needed to describe a relativistic gravitational field.
Rotating Disk Reveals Non-Euclidean Geometry
Einstein used the thought experiment of a rotating disk to show that ordinary Euclidean geometry need not describe measurements made in accelerated systems, strengthening the geometric approach to gravity.
Scalar Gravity Model Tested in Zurich
Before settling on tensor field equations, Einstein explored restricted scalar descriptions of gravitation and tested whether they could preserve relativity while reproducing known gravitational effects.
Static Gravitational Field Theory
Develops field equations for a restricted static gravitational problem while searching for a theory that can extend relativity beyond inertial reference frames.
Tensor Calculus Collaboration
Works with Marcel Grossmann to master tensor calculus for a relativistic theory of gravitation.
Turn to Non-Euclidean Geometry
Realises that gravitation may require non-Euclidean geometry, redirecting the search for a relativistic gravity theory toward curved spacetime mathematics.
Variable Light Speed in Gravity
Explores a formulation in which the coordinate speed of light varies with gravitational potential, an intermediate step toward a geometric theory of gravity.
Zurich Notebook
Uses the Zurich Notebook to explore candidate gravitational field equations and differential geometry.
Zurich Notebook Tensor Calculations
Fills the Zurich Notebook with tensor calculations while testing candidate gravitational field equations and learning the differential geometry needed for a covariant theory.
ETH Zurich Professorship
Begins work as professor of theoretical physics at ETH Zurich.
Eclipse Test Proposal
Encourages astronomical testing of gravitational light deflection during a solar eclipse.
Einstein-Besso Mercury Calculations
Works with Michele Besso on applying the developing gravitational theory to Mercury's orbit, creating calculations that later help solve the perihelion anomaly.
Einstein-Besso Mercury Perihelion Attempt
Einstein and Michele Besso calculated Mercury's anomalous perihelion motion with the provisional gravitational theory, creating a detailed test that the Entwurf equations failed to reproduce correctly.
Einstein-Grossmann Collaboration
Collaborates closely with Marcel Grossmann on the mathematical framework of gravitation.
Entwurf Field Equations Proposed
The Entwurf collaboration introduced provisional field equations intended to connect the spacetime metric with matter, giving Einstein a concrete but still incomplete relativistic theory of gravitation.
Entwurf Theory
Publishes the Entwurf gravitational theory with Marcel Grossmann as an intermediate step toward general relativity.
Entwurf Theory Links Metric to Matter
Einstein's developing theory treated the metric field as physically determined by matter and energy, moving the gravitational problem toward the geometry-source relationship later embodied in his final equations.
Entwurf Theory Published with Grossmann
Einstein and Marcel Grossmann published the Entwurf theory, an intermediate gravitational framework that used tensor methods but did not yet possess the full general covariance of general relativity.
Hole Argument Used Against General Covariance
Einstein developed the hole argument as a reason to distrust unrestricted general covariance, a position he later abandoned when completing general relativity in 1915.
Zurich Guest Lectures
Returns to Zurich for guest lectures while continuing work on relativity and quantum theory.
ETH Zurich Honorary Doctorate
Receives an honorary Doctor of Science degree from ETH Zurich.