The “afterlife” according to Einstein’s special relativity | Sabine Hossenfelder

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Published 2023-04-28
Sabine Hossenfelder discusses the physics of… dead grandmothers?

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Sabine Hossenfelder investigates life's big questions through the lens of physics, particularly Einstein's theory of special relativity. She highlights the relativity of simultaneity, which states that the notion of "now" is subjective and dependent on the observer. This leads to the block universe concept, where past, present, and future all exist simultaneously, making the past just as real as the present.

Hossenfelder also emphasizes that the fundamental laws of nature preserve information rather than destroy it. Although information about a deceased person disperses, it remains an integral part of the universe. This idea of timeless existence, derived from the study of fundamental physics, offers profound spiritual insights that can be difficult to internalize in our everyday lives. As a result, Hossenfelder encourages people to trust the scientific method and accept the profound implications of these discoveries, which may reshape our understanding of life and existence.

As a physicist, Hossenfelder trusts the knowledge gained through the scientific method and acknowledges the challenge of integrating these deep insights into our daily experiences. By contemplating these profound concepts, we can potentially expand our understanding of reality and our place within it.

0:00 Is your dead grandma still alive?
1:25 Before Einstein… and after
2:53 Relativity of simultaneity, explained
5:14 Spacetime and the ‘block universe’
6:10 Eternal existence: The conservation of quantum information
8:22 “I know it sounds crazy, but…”

Read the video transcript ► bigthink.com/series/the-big-think-interview/is-the…

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About Sabine Hossenfelder:
Sabine Hossenfelder is a physicist, author, and creator of "Science Without the Gobbledygook". She currently works at the Munich Center for Mathematical Philosophy in Germany.

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All Comments (21)
  • @bigthink
    What do you think of this explanation of time?
  • @someshkumar2411
    What we really need are more people like her who can further such ideas with scientific approach .
  • @PhillipLWilcher
    I lost my father to dementia on August 20th 2022. He was several months shy of his 100th birthday. He died in my arms at hospital. I was his full-time carer for 12 years. I had lived with him all my life. During his life, I never heard my father speak of anything spiritual, no mention of Heaven, not until his final days. During the last four days of his month-long stay at hospital, I stayed with him in his room 24/7, never leaving his side. I kept a journal, detailing his final hours. Here are my notes from that journal which I used for my eulogy at his funeral: His voice is veiled as he asks me to help him to stand up, he wants to go home. "Help me stand up" he says, "I want to go home. My mother will be wondering where I am!" Even if I could help him to stand up, he is so physically weak and depleted now, that I think we both would fall. Late yesterday afternoon, when I was about to leave him for the day, I asked him if he minded that I should go, assuring him as I do every day that I will see him again in the morning. "If I am here ..." he replies. "Where else would you be?" I ask him. "In Heaven!" How his broken voice it breaks me and so, I arrange with hospital staff for me to stay with him the night. Several hours earlier he had told me that there were people gathering about us in his room. Looking to either side of me, firstly over my left shoulder and then to my right, they who were there not for me but only him were dressed in white. "Do you recognize any of them?" I ask him. He raises a boney finger and replies: "Just one!" I ask him who the person is that he recognises and he tells me that it is himself. "What age are you?" I ask him. "I am 15!" At the time of writing this, I have been by his side a full thirty-four and a half hours. Inasmuch does his mind meander, I am never not so knowing of what he means. "Lift me up, I want to go home!" he says over and over: "I want to go home!" Holding his hand, I tell him that although I cannot lift him up physically, I can at least lift him up toward Spirit, and I place my other hand at where his heart is and say to him: "Home is where your heart is! If you live within the home that is your heart, you will always have Love; you will always know Love: God's Love!" "I want to go home!" Massaging his chest gently in a clockwise rotation, because the motion of Life is always forward even after Death, yet without actually lifting my hand from his ever weakening heart, I lean forward and whisper into his ear that he can go. "Go home! You do not have to stay, just know that I love you!" "And I love you!" He is even weaker now but not yet gone, and I do not think that I have ever known of a moment so innocent as this, the lingering of a Life as do the Guardians of Love they prepare His way. His doctor visits with me. She is concerned for me that I have stayed the night, telling me I need to look after myself. Squeezing his hand a little tighter in mine I look at her and say: "I Am" Another day passes during whose time he is bathed twice in his bed, first in the morning and then again at night: Bed Bath Lite. The ritual of cleansing a rite of passage now, water, glycerin, gels and fragrant oils, they do not soil the sheets but soothe his skin, tissue-paper thin. He breathes in and breathes out ever more purposefully on the exhale, and I copy the sequence of sighs sorrowfully, that none too cold each pant becomes, nothing so irregular, not just yet. I would bet myself he would live another year but for my fear the end is near we both do know it, and I think to myself how stealthily the dusk does creep before the breaking of each new dawn a waking day, how we live to die and die to live reborn. With his cheek resting softly upon the pillow I lay my head at his side. He places his hand on my head and touches my hair. and I want more than anything for him to keep it there. As his breathing becomes more shallow I chant: "Everything I am is of you; all my love is yours!" "Everything I am is of you; all my love is yours!" but then to add: "If you take my heart with you when you go, my love will be with you and forever more, because of the love I give to you are you a part, two soles, one heart!" I dim the light to dull the play of shadows upon his features that I see only myself in him now. And then, at the eleventh hour of my stay this day he takes his last breath and quietly slips away, into the silent land where there is only Love and Time it has no borders, bound not by night neither lit by day, only Love! Love has sped him away! (Leslie James Wilcher 16.01.1923 - 20.08.2022)
  • @denial6854
    Just watched my grandmother slowly pass away in hospice, she passed on December 23 at 1:15 am, this was also the exact same time my brother was born on this day. I hope she is still somewhere out in the universe she was such a good soul. I don’t think I’ve been more afraid of death than after seeing my grandmother in hospice
  • @ACTM21
    I feel like in a way, space time itself is what truly defines the “uniqueness” of an individual. All of us, a product of our environments within all things surrounding us, all things themselves with the potential of influencing us to make specific choices and build certain habits. Something I like to say is that “your perspective is your definition”, meaning your perspective is your reality, it’s what defines your position in space and time. No one else on this planet is within the exact area of space you take up within space time. No one else on this planet has walked the exact same steps you’ve walked in life, and no one has processed those exact thoughts you processed within each specific moment.
  • @batosato
    I am really happy to see someone who does not blatantly ignore the notion of life after death just because it does not fulfill the scientific approach. We need more people like her to encourage young scientic to think rationally and outside the box
  • @sergeycleftsow4389
    As Einstein wrote in a letter to the family of his close friend Michel Besso after his death: "Now he has departed from this strange world a little ahead of me. That means nothing. For us believing physicists, the distinction between past, present, and future only has the meaning of an illusion, though a persistent one." Einstein himself died a month after.
  • @RLDMez
    ''But as a physicist, I trust the process of knowledge discovery that comes from using the scientific method and so I take this seriously'' ❤🙌
  • @piece0fcharsiu
    this made me think of a scenario where if im on a planet lights years away, trying to find myself on earth with a super hyper-advanced telescope, I might be able to see my younger self and my late grandfather who may still be alive. idk how scientifically correct this thought is but thinking about this brought tears to my eyes.
  • @bwanablanton
    I respect Sabine, not because she validates some preconceived notion of an afterlife, but because she is honest and open about taking physics wherever it leads, regardless of how mysterious, even "unscientific," it might seem.
  • @fl_snorkeldork
    I love this explanation. My husband lost his father in his early 20's. When I was pregnant, I started doing research on my family and my husband's family because neither of us knew much. I built our family tree, scoured over census archives, old newspapers, obituaries, and found photos! One photo was of my husband's 3rd great grandfather, he was wearing his wife's bonnet as they both stood in a tree smiling from ear to ear. They were on a picnic and climbed a tree. They were having fun. I immediately started laughing and crying at the same time. My husband had the same personality as this man he never even knew about. It was a parallel moment to our life and love...except our picture was taken on a rock at the beach. It made me think maybe we aren't so different from our ancestors, despite all the time that has passed and living in completely different eras. That made me feel closer to all of my ancestors. We are them. They are us. All existing together if you think of it. Like a chain.
  • @dimatadore
    I believe in people still existing everywhere all the time after death in a broad sense because I sometimes dream of being with someone in my sleep, without knowing beforehand of their passing or having known it was coming, so the thought that they are everywhere makes sense to me because our brains interpret information they receive, and somehow a person’s essence reached my mind like a frequency I could read. I just believe my brain interprets the information the best way it knows how. I think it’s possible to be everything anywhere all the time, like a drop of ink that fills a clear water up.
  • @DaGrybo
    She is very nice and despite not knowing the afterlife research and knowing physics very well - she comes to the same conclusion that indeed time doesn't exist in the way that we observe here. I'm a medical doctor and a scientist and I study consciousness on the side, and we observe that there is a continuation of consciousness after death. I encourage everyone to keep studying if they wish, the internet is full of publications and testimonies about the subject. Cheers!
  • @pghurd3340
    This was very scientifically informative and spiritually comforting. Two things can be true at the same time.
  • @Someone-cd7yi
    I'm terrible at math, but I do love trying to visualize and wrap my head around physical concepts. Really interesting how our world, our reality is so so strange.
  • @spideken123
    "Every moment could be now for someone and that include moments in your past and it also includes all moments in your future".
  • @ScaerieTale
    The conservation of intofrmation is one of the big things that's bothered me about death for several years now. It runs contrary to everything I've learned about the laws of the universe. All their experiences, feelings, and thoughts can't just disappear because that's not how physics works. It's kind of reassuring hearing someone far, far smarter than I will ever be echoing similar thoughts
  • @bphoenix777
    She gives the best explanation of the eternal now that I have heard so far. Thanks Sabine!
  • @juliana.x0x0
    I love Sabine! So cool to see her on another channel besides her own! She is SO intelligent and good at dumbing big things down for the rest of us and making it funny and engaging.
  • @user-ee9uf4rh8m
    Something so complex, beautifully explained in the simplest manner