DanMP Posted December 27, 2022 Share Posted December 27, 2022 (edited) On 12/24/2022 at 8:18 AM, Markus Hanke said: My post referred to gravity as we experience it (in the real world around us). Yes, you would also have some version of gravity in a universe without the GR concept of time (see my last post), but it would be very different from what we actually see in our universe. l wrote: On 12/23/2022 at 4:48 PM, DanMP said: Gravity does exist regardless on how we define or understand time. and you can't deny that 😄 You are very attached to the current understanding/definition of time, the one used in GR, but you really think that this is the final/ultimate theory that we can have in order to explain gravity with all its aspects? There are already many complaints about it since dark "stuff" appeared. Some even say that dark matter is not real and is used to maintain GR valid (I don't agree but it is possible). There are MOND theories proposed. There are other attempts also, including my theory, based on dark matter. Moreover, if the GR definition/notion of time is "the one and only", please explain how is this particular definition (the notion of space-time) used in quantum physics. Also please explain why, and how exactly, gravity wells are formed around massive objects and why exactly is the speed of light invariant? If you don't have an explanation, how can you be so sure that GR is the ultimate theory? With my theory I explained them fairly easy. My opinion about time is that it is something we cannot see, touch, feel in any way. What we can see/observe is change. Because there is change, we can invent/define time as an useful notion/tool. We need it to compare changes (faster/slower), both in position (movement, speed, acceleration) and in structure (ageing, decay). We need it to make our theories, for our equations, for accurate predictions. And we also need it to write our history in chronological order. Last but not least we need it to function, to catch a train, to meet someone, to plan a trip, etc. So time is as real as density, or pressure, or temperature, but more important. 3 hours ago, Markus Hanke said: The very existence of gravitational radiation depends on the reality of time (in the GR sense), so any type of gravitational wave detector is in effect an instrument that demonstrates the existence of “time” in a rather direct way. Gravitational radiation? You mean gravitational waves? If so, what is the explanation for them? The space-time vibrates? How? You are absolutely sure that there is no other possibility to explain gravitational waves (outside GR)? How can you be? ( I have one, not the one I wrote here, that one was wrong). Edited December 27, 2022 by DanMP Link to comment Share on other sites More sharing options...
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