physics

James Lattimer

James Lattimer is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand James Lattimer rather than just read about it. In short: James Michael Lattimer (born April 12, 1950, in Marion, Indiana) is an American nuclear astrophysicist who works on the equation of state for dense nuclear matter and neutron stars. He is currently a distinguished professor at Stony Brook University.

Key takeaways

James Lattimer belongs to physics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect James Lattimer to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of James Lattimer from memory before moving on to harder problems.

Reference excerpt

James Michael Lattimer (born April 12, 1950, in Marion, Indiana) is an American nuclear astrophysicist who works on the equation of state for dense nuclear matter and neutron stars. He is currently a distinguished professor at Stony Brook University.

Career Lattimer completed his BSc in 1972 at the University of Notre Dame and his PhD in 1976 at the University of Texas at Austin. After postdoc positions at the University of Chicago and University of Illinois at Urbana-Champaign, he became a professor at Stony Brook University in 1979 and a Distinguished Professor of Physics and Astronomy in 2013. He is also associate editor of the Physical Review Letters.

Research Lattimer has made several fundamental contributions to the field of nuclear astrophysics, with a particular focus on neutron stars. One of his biggest impacts was modeling the birth of neutron stars from supernovae in 1986 with then-research assistant professor Adam Burrows. This came just six months before the closest supernova in modern history (SN 1987A, in the LMC). Their paper predicted the signature of neutrinos from supernovae that was subsequently validated by neutrino observations, from SN 1987A on February 23, 1987. In work that led to his PhD thesis, Lattimer and his advisor David Schramm first argued that the mergers of neutron stars and black holes would result in the ejection of neutron-rich matter in sufficient quantities to explain the origin of r-process elements such as gold and platinum. Later, with collaborators, he demonstrated decompressing neutron-star matter from both neutron star-black holes and neutron star-neutron star mergers would form a natural r-process that would match observed patterns. Mass ejection and r-process nucleosynthesis from decompression has been apparently observed in the aftermath of GW170817, the first merger of two neutron stars detected by LIGO/VIRGO. The inferred r-process mass seems sufficient that neutron star mergers are likely the dominant source of these nuclides. Lattimer and collaborators also proposed that the recently observed rapid cooling of the neutron star in the Cassiopeia A supernova remnant is the first direct evidence for superfluidity and superconductivity in neutron star interiors. He has collaborated extensively with Madappa Prakash.

Awards and honors In 2015, Lattimer was awarded the Hans Bethe Prize for "outstanding theoretical work connecting observations of supernovae and neutron stars with neutrino emission and the equation of state of matter beyond nuclear density." In 1985, he was awarded the Fullam (Ernest F.) Award from Dudley Observatory (1985). Lattimer has been elected to the following fellowships:

Fellow of American Astronomical Society (2023) Fellow of American Physical Society (2001) Guggenheim (J.S.) Fellowship (1999) Sloan (Alfred P.) Fellowship (1982)

References

External links Homepage of James Lattimer at Stony Brook University

Worked examples

Example 1 — a first encounter with James Lattimer

Start with the simplest possible case. Write down what James Lattimer claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to James Lattimer before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about James Lattimer ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of James Lattimer

In research: James Lattimer appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses James Lattimer in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: James Lattimer is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1950 births, 20th-century American physicists, 21st-century American physicists, so understanding it makes those chapters shorter.
In everyday life: Look for James Lattimer outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study James Lattimer in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what James Lattimer means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain James Lattimer out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is James Lattimer in simple terms?

Why does James Lattimer matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study James Lattimer?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on James Lattimer.