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Intrastellar
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Does anyone know of any resources studying these spacetimes and how physics looks like in them ? Writing 2+2 never gets you any good results on google.
robphy said:These google searches may help. (In addition to google, try https://scholar.google.com/ )
signature 2+2 spacetime
multidimensional time
One problem with two timelike directions is the presence of closed timelike curves.
Possibly interesting reference that came up:
Why 3+1 metric rather than 4+0 or 2+2? H van Dam, Y. Jack Ng (Physics Letters B, 2001)
https://doi.org/10.1016/S0370-2693(01)01140-6
JAYJACOBUS said:From what I have read
JAYJACOBUS said:space time is time like or space like
A 2+2 dimensional spacetime is a mathematical model used to describe the physical universe in which there are two dimensions of space and two dimensions of time. This means that an event or object can be located using four coordinates - two for space and two for time.
In our everyday experience, we are only able to perceive and interact with three dimensions of space. However, in a 2+2 dimensional spacetime, there are two additional dimensions of space that we cannot perceive. These extra dimensions are thought to be "curled" or "compactified," meaning they are too small for us to detect.
The concept of 2+2 dimensional spacetimes is important in theoretical physics, particularly in string theory and supergravity. These theories aim to unify the fundamental forces of nature and suggest that the universe may have more than three dimensions. The inclusion of two additional dimensions in these theories allows for more elegant mathematical descriptions of physical phenomena.
No, a 2+2 dimensional spacetime cannot be visualized in the same way that we can visualize three dimensions. Our brains are not equipped to imagine or visualize dimensions beyond what we experience in our everyday lives. However, mathematicians and physicists use complex mathematical equations and models to understand and describe 2+2 dimensional spacetimes.
In a 2+2 dimensional spacetime, time is treated as a fourth dimension, similar to space. This means that time is also relative and can be affected by gravity and the speed of an object. However, the concept of time in a 2+2 dimensional spacetime is still a topic of ongoing research and debate among physicists.