TIME

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“In a time of deceit telling the truth is a revolutionary act. If liberty means anything at all, it means the right to tell people what they do not want to hear.”
George Orwell

 

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January 23, 2023

Twisting Up Atoms Through Space and Time

Twisting Up Atoms Through Space and Time

By Dina Genkina — Joint Quantum Institute

One of the most exciting applications of quantum computers will be to direct their gaze inwards, at the very quantum rules that make them tick. Quantum computers can be used to simulate quantum physics itself, and perhaps even explore realms that don’t exist anywhere in nature.

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This $42 Million-Dollar Timekeeping Device

runs for 10 millena

By ALLISON ECK — PBS NOVA

Could this “10,000-year clock,” which looks like it’s straight out of a Star Trek episode or the set of Interstellar, inspire people to start thinking long-term?

Mindfulness gurus tell us to focus on the present, but what if we chose to be much more forward-thinking? How would society function if we saw a year as not 12 months, but a sliver of a century?

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Time to Change Your Clocks Again

but why?

By Leda Gore — AI

A bill passed to end daylight saving time. Here’s why you still have to change your clocks.

The ritual of “falling back” – setting clocks back one hour to mark the end of daylight saving time – officially takes place at 2 a.m. Saturday. The hour clock change doesn’t alter time itself, of course, but shifts more daylight into the morning instead of the evening.

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Why Time Passes Faster As You Age

Mind time cannot be measured on a watch.

By Ephrat Livni — QUARTZ

Mind time and clock time are two totally different things. They flow at varying rates.

The chronological passage of the hours, days, and years on clocks and calendars is a steady, measurable phenomenon. Yet our perception of time shifts constantly, depending on the activities we’re engaged in, our age, and even how much rest we get. 

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What Is Happening “Now” Is Relative

In special relativity, the statement that two events happened at the same time is meaningless.

By Sabine Hossenfelder — BIG THINK

  • We always see things as they looked a little bit earlier, but we don’t normally notice this in everyday life. It gets even weirder, though. 
  •  In special relativity, the statement that two events happened at the same time is meaningless. 
  • Every event is “now” for someone.
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Does the Past Still Exist

By Sabine Hossenfelder

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TIME: A Discussion

Carlo Rovelli and Oliver Burkeman talk about time

By 5×15

Watch the FREE video!

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The Nature of Time

By Carlo Rovelli

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What Is Time? What Is Space?

By Carlo Rovelli

“A novel image of the world is taking shape in fundamental physics: a world without time and without space. Time and space as we know them will disappear from the scientific picture of the world, in the same way in which the centre of the universe did”.

In this agile text, derived from a long interview, Carlo Rovelli, theoretical physicist and pioneer of modern quantum gravity, describes his personal and intellectual journey, starting from the rebellion of his young years and the discovery of the “enchanting adventure” of theoretical research, till the vertiginous hypotheses of today’s physics. In a simple language, Rovelli introduces us to a “space” made of grains, a “time” which is the result of our ignorance, to hot black holes and how to think about the beginning of the universe.

But he also discusses the value, the risks, and the fascination of this quest. Science, for Rovelli, is a continuous exploration of new ways of thinking the world, the desire of looking “beyond the hill” and seeing the world always with new eyes, the choice of never giving up dreams.

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The Illusion of Time?

By Carlo Rovelli

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Four Thousand Weeks

time management for mortals

By Oliver Burkeman

The average human lifespan is absurdly, insultingly brief. Assuming you live to be eighty, you have just over four thousand weeks.

Nobody needs telling there isn’t enough time. We’re obsessed with our lengthening to-do lists, our overfilled inboxes, work-life balance, and the ceaseless battle against distraction; and we’re deluged with advice on becoming more productive and efficient, and “life hacks” to optimize our days. But such techniques often end up making things worse. The sense of anxious hurry grows more intense, and still the most meaningful parts of life seem to lie just beyond the horizon. Still, we rarely make the connection between our daily struggles with time and the ultimate time management problem: the challenge of how best to use our four thousand weeks.

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What Is Time, And How Do We Know It Exists?

We experience its flow constantly but it’s not obvious what time actually is.

By Alfredo Carpineti — IFLSCIENCE

Time. We can’t get enough of it. We are desperate to make it flow faster or slower, and yet we are reminded again and again to live in the now. When it comes to big philosophical questions, the concept of time and related ideas like past, present, and future are among the big hitters. Is the future already written? What do we mean by the present? Does the past exist?  

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What Is the Planck Time?

By Andrew May — Space.com

The almost impossibly brief Planck time has been known since the 19th century. Originally dismissed as a mere curiosity, it may hold the key to understanding the universe.

The Planck time is an incredibly small interval of time that emerges naturally from a few basic quantities in theoretical physics. When it was discovered by Max Planck at the end of the 19th century, it seemed to be no more than a scientific curiosity. But today it plays a tantalizing role in our understanding of the Big Bang and the search for a theory of quantum gravity

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Superposition of Photon

Goes Forward and Backward in Time

By Dr. Alfredo Carpineti — IFLSCIENCE

Experiments demonstrate that it is possible to put a photon in a superposition of processes going in opposite time directions.

Two different groups have tested a seemingly counter-intuitive property of the quantum world: That it’s possible to put a photon, a particle of light, in a superposition of states going forward and backward in time. This is not time travel and won’t lead to communicating with the past – but it is an intriguing demonstration of how time can be thought to work at a quantum level.

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An Entirely New Way of Measuring Time

By Mike McCray — Physics

Marking the passage of time in a world of ticking clocks and swinging pendulums is a simple case of counting the seconds between ‘then’ and ‘now’.

Down at the quantum scale of buzzing electrons, however, ‘then’ can’t always be anticipated. Worse still, ‘now’ often blurs into a haze of uncertainty. A stopwatch simply isn’t going to cut it for some scenarios.

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The Thorny Problem of Keeping the Internet’s Time

An obscure software system synchronizes the network’s clocks. Who will keep it running?

By Nate Hopper — The New Yorker

In 1977, David Mills, an eccentric engineer and computer scientist, took a job at comsat, a satellite corporation headquartered in Washington, D.C. Mills was an inveterate tinkerer: he’d once built a hearing aid for a girlfriend’s uncle, and had consulted for Ford on how paper-tape computers might be put into cars. Now, at comsat, Mills became involved in the arpanet, the computer network that would become the precursor to the Internet. A handful of researchers were already using the network to connect their distant computers and trade information. But the fidelity of that exchanged data was threatened by a distinct deficiency: the machines did not share a single, reliable synchronized time.

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How Do We Know That Time Exists?

By CORDIS — Phys.Org

The alarm goes off in the morning. You catch your morning train to the office. You take a lunch break. You catch your evening train back. You go for an hour’s run. Eat dinner. Go to bed. Repeat. Birthdays are celebrated, deaths commemorated. New countries are born, empires rise and fall. The whole of human existence is bound to the passing of time.

But we can’t see it and we can’t touch it. So, how do we know that it’s really there?

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Why Does Time Go Forwards, Not Backwards?

By Martha Henriques — BBC

The arrow of time began its journey at the Big Bang, and when the Universe eventually dies there will be no more future and no past. In the meantime, what is it that drives time ever onward?

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Time Reborn

From the Crisis in Physics to the Future of the Universe

By Lee Smolin

A radical new view of the nature of time and the cosmos.

What is time?
 
This deceptively simple question is the single most important problem facing science as we probe deeper into the fundamentals of the universe. All of the mysteries physicists and cosmologists face—from the Big Bang to the future of the universe, from the puzzles of quantum physics to the unification of forces and particles—come down to the nature of time.
 
The fact that time is real may seem obvious. You experience it passing every day when you watch clocks tick, bread toast, and children grow. But most physicists, from Newton to Einstein to today’s quantum theorists, have seen things differently. The scientific case for time being an illusion is formidable. That is why the consequences of adopting the view that time is real are revolutionary.

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The Nature of Time

By Lee Smolin

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A New Theory of Time

By Lee Smolin

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A World in Time

By Lee Smolin

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“The past is another country: they do things differently there.”
— L.P. Hartly, The Go-Between

Until the End of Time

Mind, Matter, and Our Search for Meaning in an Evolving Universe

By Brian Greene

Until the End of Time is Brian Greene’s breathtaking new exploration of the cosmos and our quest to find meaning in the face of this vast expanse. Greene takes us on a journey from the big bang to the end of time, exploring how lasting structures formed, how life and mind emerged, and how we grapple with our existence through narrative, myth, religion, creative expression, science, the quest for truth, and a deep longing for the eternal. From particles to planets, consciousness to creativity, matter to meaning—Brian Greene allows us all to grasp and appreciate our fleeting but utterly exquisite moment in the cosmos.

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The Richness of Time

By Brian Greene

Join a physicist, a neuroscientist, and a linguist as they explore the deep enigmas of time. Time feels like it flows, but does it? Time seems to have a built-in direction, from past to future, but is that real or merely a quality imposed by the human brain? Time on earth elapses at a uniform rate, so why does the human experience of time seem so varied? How do various neurological afflictions change the perception of time? And underneath it all, how does human language impact our ability to think about time and fully experience its rich and mysterious contours?

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Carlo Rovelli Interview

“reality is not things but connections.”

By New Scientist

Inspired by the art of Cornelia Parker, physicist Carlo Rovelli explains the idea of relational quantum mechanics – and how it could resolve some key problems concerning the nature of reality.

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Time Travel: A History

By James Gleick

James Gleick delivers a mind-bending exploration of time travel—from its origins in literature and science to its influence on our understanding of time itself. Gleick vividly explores physics, technology, philosophy, and art as each relates to time travel and tells the story of the concept’s cultural evolutions—from H.G. Wells to Doctor Who, from Proust to Woody Allen. He takes a close look at the porous boundary between science fiction and modern physics, and, finally, delves into what it all means in our own moment in time—the world of the instantaneous, with its all-consuming present and vanishing future.

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Portal Opens to Extra Time Dimension

just what we need, eh?

By Zeeya Merali  — Scientific American

Opening a portal to an extra time dimension—even just a theoretical one—sounds thrilling, but it was not the physicists’ original plan. 

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Time Isn’t Simply Just Another Dimension

By Ethan Siegal — BIG Think

We live in a four-dimensional Universe, where matter and energy curve the fabric of spacetime. But time sure is different from space!

  • According to Einstein’s General Relativity, matter and energy curve the fabric of spacetime, and that curved spacetime determines the motion of matter and energy. 
  • But while spacetime itself is four dimensional, it can be decomposed into three spatial dimensions and one time dimension. 
  • Even though we understand the mathematics governing them magnificently, time has some fundamental differences from every other dimension; here’s what everyone should know.
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Where Do Space, Time and Gravity Come From?

By Quanta Magazine

Einstein’s description of curved space-time doesn’t easily mesh with a universe made up of quantum wavefunctions. Theoretical physicist Sean Carroll discusses the quest for quantum gravity with host Steven Strogatz.

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The Biggest Ideas in the Universe

By Sean Carroll — The Royal Institution

Join Sean M Carroll as he explores deep questions about the cosmos, laying out the framework of classical physics from Euclid and Galileo to Newton and Einstein.

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Timeless Reality

Symmetry, Simplicity, and Multiple Universes

By Victor J. Stenger

Quantum physics has many extraordinary implications. One of the most extraordinary is that events at the atomic and subatomic level seem to depend on the future as well as the past. Is time really reversible?Physicist Victor J. Stenger says yes. Contrary to our most basic assumptions about the inevitable flow of time from past to future, the underlying reality of all phenomena may have no beginning and no end, and not be governed by an “arrow of time.” 

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