New answers tagged

3

So far there is no definitive answer as to why time flows forward. While many scientists speculate what may the cause of this asymmetry in time none of the options has been accepted as the one answer. Often these ideas lack a complete understanding of the underlying more complex principles that we cannot yet understand but here is one of the most common ...


0

The answer to this relies on knowing about the extended solutions for the Schwarzschild solution, namely the Kruskal solution. In this solution, there is not just a black hole, but a pair of a black hole and a white hole. Particles move from the white hole in the distant past, and then eventually fall into the black hole. Therefore, the time-reversed ...


3

The flow of time is not simply modelled by the real line. The real line with sum $(\mathbb{R},+)$ is an abelian group that is commonly used to model the time coordinate, and the fact that it is possible to "shift the origin" of time (choose which time should represent the starting point). The flow of time could be modelled by a function $f:\mathbb{R}\to ...


4

The transformation $t \mapsto -t$ transforms an ascending function into a decreasing one. It thus inverts the flow of time. You have to think of it as a transformation on the variable $t$ which is an input in observables : each observable $O(t)$ will see time flowing backwards. Assume you want to apply the time-inverting transformation at some time $t_0$. ...


4

Your talk of the "sequence" of times does not make formal sense, but time reversal is indeed the map $t\mapsto -t$, so $50\mapsto -50$, etc. The velocity is not constrained to be an odd or even function of time. That time reversal "negates" the velocity does not mean that $v(-t) = -v(t)$. It means that $v(t)\mapsto -v(t)$ under the time reversal map, but ...


1

Time is just a scale we use to measure the rate of processes or to measure the interval between 2 events. Time is not a stand-alone entity and it does not exist alone independently. All the means (like clocks) we employ to measure Time use some standard physical changes as their fundamental measuring units of Time. So Time has no direction of its own, ...


3

This is a question that cannot be answered without understanding what time is. And I think the best we can say is that time is a quantity we use to compare events. But the compared feature is the ordering. Bearing that in mind, we cannot say much about its reality, even less about its direction. In other words, despite the fact that you can order events, ...


-1

Time is relative, meaning that time never runs exactly the same in 1 place than another even on the same world. Time runs fast next to the sun while time on Pluto would run slower than here. Next to a black hole time would from almost seam to stop. There is no universal clock to set time by only what we created on Earth for ourselves. Time only moves ...



Top 50 recent answers are included