Talks and shows

How real is the past?

Paul Davies examines what quantum "retro-effects" tell us about the universe, and how they can be put to use in new tech.

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You might think that the happenings of the past are a done deal. Events that are now set in stone. Although we may not know the details of everything that happened, we can confidently assume there were definite 'facts of the matter' concerning past events. But that's where Quantum Physics comes in to turn things on its head - in quantum physics, the existence of a definite, specific historical pathway leading to the present is denied. It proposes that instead of a fixed series of events, we must envisage the past as a ghostly amalgam of blended potential realities.

Einstein described the ability of quantum systems to be entangled telepathically across space as “spooky action at a distance.” But the same physics can be described as "spooky action back in time."  In this talk, physicist Paul Davies examines these spooky quantum "retro-effects", which are already being utilised by technologies such as quantum computing, and their implications. Heisenberg's uncertainty principle states that there is a limit to the precision with which certain pairs of physical properties, such as position and momentum, can be simultaneously known. His work reaches into the future, but also stretches back in time. When experiments are performed to observe past events, they collapse due to contending pasts, pointing to a possible form of backwards causation?

If the past, like the future, is fuzzy and undetermined, what does that say about attempts to explain the origin of the universe as a quantum event? And indeed, how real are the events of the past at all? Paul will look to answer these questions and more in this talk that's bound to leave you questioning everything you know.

Copies of Paul's book "Quantum 2.0" will be available to purchase after the talk.

Event type

This is a theatre and livestream event for an adult audience, where the speakers and audience in our Theatre are joined by our audience online. 

By booking to attend events at the Royal Institution, you confirm that you have read and accept the Ri's event terms and conditions. You also agree to abide by our code of conduct, and help to create a great experience for yourself and your fellow participants. Please note that Eventbrite adds a small booking fee to the amount paid for each ticket option.

For any queries regarding this event please get in touch by phone 020 7409 2992 or email events@ri.ac.uk.

This is an event at the Ri. 

About Paul Davies

Paul Davies
Templeton Foundation

Paul Davies is a Regents' Professor of Physics and Director of the Beyond Center for Fundamental Concepts in Science at Arizona State University. 

He is the recipient of many awards including the Templeton Prize and the Faraday Prize of the Royal Society. 

He is a Member of the Order of Australia and has an asteroid named after him.

Timing

Doors to the theatre will open at 6.45pm and the talk will begin at 7.00pm.

Timing for the livestream

The livestream will go live at 6.55pm and the introduction will begin at 7.00pm. If you register but miss the livestream, the video will be available to you via the same link for two weeks after the event date.

Accessibility

The event will take place on the first floor and there is step-free access from the street via lift.

The closest underground station is Green Park, which is step-free.

There is space at floor level in the theatre for wheelchair users.

Seating is usually unreserved for our events. If you and your group require seating reservations, please do let us know by emailing us at events@ri.ac.uk, and we’ll be more than happy to help.

Carers can receive a free ticket to an event by emailing events@ri.ac.uk.

Our theatre is equipped with an Audio Induction Loop. 

Event terms and conditions